Zabbix value cache 1 Configuring a trigger. We have not added many new devices for monitoring during this time. 2 Preprocessing details. This means if configuration was changed and request range is less, the cache will still keep values based on the old request range. To enable the value cache functionality, an optional ValueCacheSize parameter is supported by the Zabbix server configuration file. # # Mandatory: no Range: 128K-2G Default: TrendCacheSize=4M ### Option: ValueCacheSize # Size of history value cache, in bytes. Integer (for size); float (for percentage). On the other hand I see this in the log: 177:20200617:080919. 2 Definitions. Hello, I'm using Zabbix to monitor a really small network, only 7 servers, zabbix included. To make the calculation of trigger expressions, calculated items and some macros much faster, a value cache option is supported by the Zabbix server. values:21 itemid:2506641 5. バリューキャッシュを監視するには、以下の2つの内部チェックアイテムが利用できます。 Join our translation project and help translate Zabbix documentation into your native language. you wait and this occour; Result: See screenshot 11 Value cache Overview. 191890:20200219:204405. This wasn't caught for several hours as no one is working this week. cntr_value * ISNULL ((100. Shared memory size for caching item history data requests. The percentage of used data buffer. The old item values are removed from value cache based on the maximum request range. but this not expected. There is no recurring activity on the server running zabbix, such as backup or such, so i cannot explain how that could be. 2 What is Zabbix. I then started to see similar behavior with the trend write cache. 11 Value cache Overview. Value cache now also tracks the item daily range and once per day updates the active range with daily range. Export. ZABBIX BUGS AND ISSUES; ZBX-9731; Unused items can cause value cache to switch to low memory mode. Two internal items are supported for monitoring the value cache: zabbix[vcache,buffer,<mode>] and zabbix[vcache,cache,<parameter>]. 16M is not enough and your server will crash again as soon as you add another host. For value cache, I had a case where Zabbix had been down for some time, after restart the value cache was exhausted, but after a more normal restart, without the backlog of data, value cache was adequate. 15 Restricting agent checks. 3. Zabbix 1600px Default Style - Zabbix-- Zabbix 1600px; vB5 Style; Dark SELECT a. How do I clear it? I'm increasing the CacheSize value every week. Previously, this value did not increase, but now it is increasing. The value cache usage started increasing. JPG Zabbix Server - History Cache. It seems that nothing can stop it . 3 Zabbix processes. For me help change parameter ValueCacheSize from 8M to 16M. Mi viene notificato che il valore Zabbix server: Value cache, 95% used . To make the calculation of trigger expressions, calculated/aggregate items and some macros much faster, since Zabbix 2. However this range can be only increased. My DevOps stack: Docker / Kubernetes / Mesos / ECS / Terraform / Elasticsearch / Zabbix / Grafana / Puppet / Ansible / Vagrant Hi, I have a problem with the Configuration Cache. Hello, On this alarm tutorial he also talks about the problem "Zabbix alerter processes more than 75% busy” (Step 6,d) The system run about 30% of value cache. I set it to 16M and restarted the server. 4 Zabbix overview. See more details with internal Sorunun çözümü için yapmanız gereken zabbix config dosyasında yer ValueCacheSize alanı değiştirmek olacaktır. dm_os_performance_counters a JOIN ( SELECT cntr_value, OBJECT_NAME FROM sys. 10, had a 2G value cache that runs about 15% used. 2から To apply the new CacheSize value, you have to restart the zabbix-server service. object_name, 'BufferCacheHitRatio' AS counter_name, '' AS instance_name, cast (a. # # Mandatory: no Range: 0,128K-64G Default: ValueCacheSize=8M I had value cache under 40% normally. After 24 hours working in low memory mode the value cache 12 Value cache Overview. Ce cache mémoire peut être utilisé pour des données d'historiques, au lieu de passer des appels SQL directs à la base de The effectiveness statistics of the Zabbix trend function cache. 39% Trigger: Less than 5% free in the value cache [<5] During that time above I go into low memory mode. Hi, I'm having a rather odd problem, where the value cache usage increases every day with about 4%; and after it goes into low memory mode, calculations show the wrong value. The number of cache hits (history values taken from the cache). ValueCacheSize value was modified from 8M to 32M even after the event is getting triggered. 10 Value cache Overview. The effectiveness statistics of the Zabbix trend function cache. Setting to 0 disables the value cache (not recommended). 2 Trigger expression. The shared memory size for caching item history data requests. I'm trying to figure how to deal with value cache and I'm wondering why I have big mismatch between "values" and "request. ". Details. cros. Don't mix up different caches you ask for value cache (zabbix_server -R diaginfo=valuecache) and then complain about config cache being 91%. Looking for recommendations on cache size on a Zabbix server. 4 Real-time export of events, values, trends. Holes in the graphics Terry lin I know that you do not know me, but, thank you friend, by the answer. This in-memory cache can be used for accessing historical data, instead of It will return 0 if value cache is working in normal mode and 1 if it is working in low memory mode. 126 ===== 14891:20220629:113807. 0 New processes Adjusted health monitoring Performance improvements Proxy load balancing. 11 Cache de valeur Aperçu. JPG Zabbix Server - Timer Process. Ver más detalles en métricas internas. バリューキャッシュ機能を有効にするために、オプションの ValueCacheSize パラメータが Zabbix server の 設定ファイル でサポートされています。. zabbix_server. Добрый день. JPG Zabbix Server - History Syncer Process. I checked the server config file and saw that the value cache was set to the default one which is 8M. # Shared memory size for storing trends data. Two internal items are supported for monitoring the value cache: zabbix If historical values are not present in the cache, the missing values are requested from the database and the cache updated accordingly. ZABBIX BUGS AND ISSUES; ZBX-16678; Zabbix Core Server: Zabbix value cache working in low memory mode NethServer Version: 7. 2 a value cache option is supported by the Zabbix server. It resulted in massive performance improvements (up to 10 times), mostly because of a significantly reduced database access (that we looked at in previous blog posts). Currently I don’t know which is the default cache size. Use this forum to ask questions about how to do things in Zabbix. 433 === memory statistics for value cache size === Then check Monitoring -> Graphs -> Zabbix server -> Zabbix Cache usage graph Comment. Note that this change does not affect frontend The effectiveness statistics of the Zabbix trend function cache. to raise it just restart the zabbix-server service Steps to reproduce: Temporary spike in % value cache used >75%; zabbix [vcache,cache,mode] item switches to 1 = "low memory mode"; Temporary spike drops below 75%; zabbix [vcache,cache,mode] item stays at 1 = "low memory mode"; Para efetuar os cálculos das expressões de triggers, itens calculados, itens agregados, e macros de forma mais ágil o Zabbix (a partir da versão 2. Filled up gradually after a rebootafter about a week, stabilized and Zabbix is the ultimate enterprise-level software designed for real-time monitoring of millions of metrics collected from tens of thousands of servers, virtual machines and network devices. So i tried to up the value to 256M and 10 Value cache Overview. 2 New things in Zabbix 7. Hello, I have an unsupported item throwing the following error: Cannot evaluate expression: "Cannot evaluate function "change()": cannot get values from value cache. Availability statistics of Zabbix value cache. 3 with CentOS8 and monitor about 300 server. x86_64 4. zabbix[vcache 7 What's new in Zabbix 6. Check value cache; Result: Permanently increasing values in the value cache for items with triggers using either min, avg or max functions with time in the parameters on the new hosts. 8 What's new in Zabbix 6. # Setting to 0 disables value cache. x is now supported. If the value is not available in the cache yet, Zabbix will query the database and update the cache. Pour effectuer le calcul des déclencheurs, des éléments calculés et de certaines macros beaucoup plus rapidement, une option de cache de valeur est prise en charge par le serveur Zabbix. If it reaches above 90%, the Zabbix Server Container shuts down. 28 on 12th of April. See more details with internal Shared memory size for storing trends data. the spike happen all by itself Our zabbix instance went into 'low memory' value cache operating mode a while ago and I have not been able to figure out why. No, your value cache says on that same pic 6. Two internal items are supported for monitoring the value cache: zabbix The system run about 30% of value cache. com Zabbix daemons use various approaches to improve performance. 168 free chunks of size 40 bytes: 899 14891:20220629:113807. www. 4. 0 support. 2 Item value preprocessing. zabbix[vcache 11 Cache de valeur Aperçu. After 24 hours working in low memory mode the value cache # Size of trend cache, in bytes. I've got successive "Zabbix value cache working in low memory mode" triggers, and initially increased the cachesize up to 32M. Steps to reproduce: Only time. for reset this situation I restart zabbix-server increase value cache in the configuration file do not resolve. if I see the graph seems something bug. JPG Zabbix Server - Value Performance. 9 Module: Zabbix 5. トリガーの条件式、計算/集計されたアイテム、複数のマクロをより速く計算するため、Zabbix 2. 12 Value cache. 3 Secure connection to the database. 32 What's new in Zabbix 5. Zabbix 7. When the value cache runs out of the shared memory a warning message is written to the server log every 5 minutes. zabbix[vcache Wait until at least 2 values are obtained for this data element to calculate the diff function. Low Memory. 3 Triggers. log output after adding 6 new devices. When an item is not accessed for a day or more value cache will continue to collect its history data and will remove it from cache only when it rans out of free space. Zabbix server . 1. 13 Execute now. 28-1. Trigger: Less than 25% free in the value cache Trigger status: PROBLEM Trigger severity: Average Trigger URL: Trigger Hostgroup: Discovered Hosts, Linux DCW, Linux_Corp, Zabbix Para efetuar os cálculos das expressões de triggers, itens calculados, itens agregados, e macros de forma mais ágil o Zabbix (a partir da versão 2. As a side note, you can view the graph of all your Zabbix server Cache The size of the history value cache, in bytes. This in-memory cache can be used for accessing historical data, instead of Initially, Value cache would fill up and then hover around 15-20% full. Change per second 2 Repairing Zabbix database character set and collation. Post Cancel. You do have Hello! I have problem figuring out what's causing the Zabbix server to report the problem: More than 75% used in the configuration cache. I increased value Zabbix value cache is continuously exhausting. Even when sending any value which must not create a problem, it is ignored, value is colected from value cache and problem is detected. We normally hover around 80% of "Zabbix value cache % used". Hi at all, I have a Zabbix server V5. Deze in-memory cache kan worden gebruikt voor het ophalen van historische gegevens, in plaats van rechtstreekse SQL-oproepen naar de database 11 Value cache Overview. Hey folks, another Zabbix post today. 0 / NULLIF (b. 908 === items with most values in value cache === 191890: UNSUPPORTED : Cannot evaluate function "change()": cannot get values from value cache 03-12-2020, 19:59. conf from the standard 32M to a higher. 2. After zabbix server OS patching, zabbix-server didn't restart due to not being systemctl enabled. This is fine, but I want to understand what the default value is now 11 Value cache Overview. # Shared memory size for caching item history data requests. conf file on your system look for setting CacheSize= Make sure it is uncommented (no # in the beginning of line), and set the value four times higher than it is now. JPG Zabbix Server - Value Cache Hits. 10 Waarde cache Overzicht. Zabbix is the ultimate enterprise-level software designed for real-time monitoring of millions of metrics collected from tens of thousands of servers, virtual machines and network devices. This will cause unused values to be eventually removed if the item request range was reduced. This cache slightly changes how Zabbix operates, though, Hi, working with Zabbix 6. We have slowly increased our value cache, but keep getting warnings and going into low memory mode. While for many items the update intervals are quite short, there are others (including low-level discovery rules) for which the update intervals are quite long, so in real-life situations there may be a need to check for a new value quicker - to pick up Attachments: Zabbix Server - Configuration Cache. Attachments 11 Value cache Overview. values: itemid:2506634 values:69208 request. #ValueCacheSize=8M; Value Cache Working. first problem: every night at 3am sharp there is an unexplained spike of value cache. JPG Zabbix Template With 10 Value cache Overview. Zabbix internal: zabbix[vcache,buffer,pused] Value cache hits: The effectiveness statistics of Zabbix value cache. I have tried to Google the problem and also found a solution to change the value of CacheSize in zabbix_server. Joined: Jul 2017; Posts: 87 #5. See more details with internal items. It's at AWS and using RDS so the CPU and memory loads are low but we do run into the values cache alert with some frequency. Default: 8M Range: 0,128K-64G. 4 TimescaleDB setup. 19 % left,but there's still warning in server log . 1 Introduction. 4 Value cache improvements. Setting to 0 disables value cache. 9 What's new in Zabbix 6. OpenSSL 3. This in-memory cache can be used for accessing historical data, instead of The effectiveness statistics of the Zabbix trend function cache. Valid modes are: total - total size of buffer free - size of free buffer pfree - percentage of free buffer used - size of used buffer pused - percentage of used buffer (not supported on proxy) zabbix[vcache,cache,<parameter>] Effectiveness statistics of 11 Value cache Overview. When working in low memory mode value cache will attempt to switch back to normal operational mode once per day. -470 hosts-35000 items-19000 triggers-500 new values per second Current settings: CacheSize=128M Running 6. you wait and this occour; Result: See screenshot Less than 5% free in the value cache: Problem We've been using zabbix for more than 6 months already and never had this problem. Our value cache usage % is currently 23% and has a max value of 42% since well before this issue happened. 28 OpenSSL 3. Para habilitar la funcionalidad de caché de valores, el servidor Zabbix soporta un parámetro opcional ValueCacheSize en el archivo de configuración. Have a problem on "Zabbix value cache working in low memory mode" . Zabbix internal: zabbix[vcache,cache,hits] Preprocessing. Ho alzato il parametro CacheSize a CacheSize=5120M e riavviato il servizio, ma continua sempre ad andare oltre il 95%. after about 15 day goes to 90% . Resulting in Zabbix value cache working in low memory mode alert (See value-cache-server-log. dm_os_performance_counters WHERE counter_name = 'Buffer Zabbix still uses value cache to calculate trigger, and it seems the value will stay there until Zabbix server restart. null XML Word Printable. Salve, ho un problema con la mia versione 7. See more details with internal [ZBX-16678] Zabbix Core Server: Zabbix value cache working in low memory mode Created: 2019 Sep 25 Updated: 2019 Sep 26 Resolved: 2019 Sep 26 Status: Closed: Project: ZABBIX BUGS AND ISSUES: Component/s: None Affects Version/s: None I allocate ValueCacheSize=64M,and last value 'Zabbix value cache, % free' shows there's 40. 5 What's new in Zabbix 7. zabbix[vcache 要启用值缓存功能，Zabbix服务器配置文件支持可选的ValueCacheSize参数。 有两个内部的监控项来监控值缓存：zabbix [vcache，buffer，<mode>]和zabbix [vcache，cache，<parameter>]。查看更多有内部监控项的细节。 10 Value cache Overview. Is there others which use 6. 1 "Value Cache is Fully used" 18-02-2015, 12:10. 0 If your nice zabbix 5. Zabbix 2. See more details with internal 11 Value cache Overview. One such measure, introduced in Zabbix 1. After 24 hours working in low memory mode the value cache must switch back to normal mode. cntr_value,0)),0) AS dec (3, 0)) AS cntr_value FROM sys. 2 PostgreSQL encryption configuration. After a zabbix server reboot - the cache would go back to empty, and then over the course of a week would gradually fill back up again. 4 10 Value cache Overview. Vault. Simply all those very long delayed items discovered by mine SQL script are ignored by this queue; Zabbix Value Cache is about 50% free; Zabbix pooler processes are busy maximally for 43%, average for 31% 10 Value cache Overview. 14891:20220629:113807. conf: ValueCacheSize=256M Comments Comment by Arli [ 2013 Nov 18] I tried with a smaller cache sizes and it seems to me that it actually levels out at some point and cache goes into low 1. 28% 90. # # Mandatory: no # Range: 128K-2G # Default: # TrendCacheSize=4M TrendCacheSize=512M ### Option: ValueCacheSize # Size of history value cache, in bytes. In zabbix_server. This in-memory cache can be used for accessing historical data, instead of making direct SQL calls to So for this round I see the cache get used for a single 24 hours period last min zabbix value cache, % free [all] 80. See more details with internal If historical values are not present in the cache, the missing values are requested from the database and the cache updated accordingly. Specifies the vault provider: We have 70 hosts in Zabbix and our value cache is setted to 50MB, but once a week it get higher than 95% and we have to restar Zabbix Server to flush Value Cache Size, there is a recommendation for value cache size by Host or Items or Triggers? Or every thing else? Or other setup to do in Server to bring it more stable? Cache usage. Now I got it again and I've confirmed for the past 24h my value cache % was always below 20%. This in-memory cache can be used for accessing historical data, instead of making direct SQL calls to the database. Update intervals and history If my Zabbix server conf file has ValueCacheSize disabled/commented out, what is the default value for the VaultCacheSize? I ask because I am getting an alert now that I am using 95% of the Value Cache and it suggests increasing the value in the server conf. To solve, go back to your Zabbix config file (zabbix_server. 28 seeing a similar pattern? Is there a practical way to check what is using the cache? Thanks! Check value cache; Result: Permanently increasing values in the value cache for items with triggers using either min, avg or max functions with time in the parameters on the new hosts. Alguém ja teve esse problema??? Steps to reproduce: Create a trigger prototype based on 2 discovered values; The trigger get triggered; Leave the problem as is for a few months; The value cache gets full because ALL the values since the trigger is triggered are kept in the value cache The zabbix server log show al lot of "value cache is fully used: please increase ValueCacheSize configuration parameter" After checking the cache usage, it is only using 20 % of the cache size. After Zabbix was restarted, in about 18 hours, all of value cache was consumed. In Zabbix - Administration - Queue is displayed that only 1-10 items are delayed but not more that 10s. . a see free 80% and all of a sudden it goes below the threshold . 3 Value cache Configuration cache Trend cache. 168 free chunks of size 32 bytes: 1691 14891:20220629:113807. conf value you can adjust Dizzybro • There are multiple cache size values you'll have to tinker with. This in-memory cache can be used for accessing historical data, instead of Zabbix value cache working in low memory mode - ZABBIX Forums. Om de berekening van trigger-expressies, berekende items en sommige macro's aanzienlijk sneller te maken, wordt een optie voor waardecaching ondersteund door de Zabbix-server. Restart Zabbix server service and you should be good. 0 tells you that the ValueCache is insufficient for the configuration and you cannot optimize any of the settings (lots of thing could be done for that) you can still increase you ValueCacheSize. Introduction. value cache is fully used: please increase ValueCacheSize configuration parameter It will return 0 if value cache is working in normal mode and 1 if it is working in low memory mode. Under some circumstances it is possible that zabbix server logs are populated with messages that value cache is fully used, however internal metrics and charts for value cache does not show any deviations and it remains on the same level before and after. 12 Value cache Overview. As with all newly introduced processes, this cache’s effectiveness can be monitored using internal check zabbix[tcache,cache,], which can be used to set the relevant TrendFunctionCacheSize parameter value. 168 free chunks of size 24 bytes: 562 14891:20220629:113807. JPG Zabbix Server - Value Cache. el7 @zabbix Description Steps to reproduce: Leave the problem as is for a few months; The value cache gets full because ALL the values since the trigger is triggered are kept in the value cache; Trigger. zabbix[vcache,buffer,] The availability statistics of the Zabbix value cache. 86% 42. I restart earlier this morning and of course see: Zabbix value cache operating mode (zabbix:zabbix[vcache,cache,mode]): Normal (0) So back to normal. Here a few different examples: From Debug log: fast expression evaluation without SQLs - value cache is used as should be ideally: It will return 0 if value cache is working in normal mode and 1 if it is working in low memory mode. zabbix[uptime] The uptime of the Zabbix server or proxy process in seconds. Para efetuar os cálculos das expressões de triggers, itens calculados, itens agregados, e macros de forma mais ágil o Zabbix (a partir da versão 2. The value cache is used to speed up calculations of trigger expressions, calculated items, dependent items and other things within Zabbix where it is more optimal to pull historical data straight from memory rather than re querying the database tables every time a value is needed. 3 Elasticsearch setup. As you can see in the Zabbix Cache Usage graph, the problem is now resolved. Checking for a new item value in Zabbix is a cyclic process that is based on configured update intervals. Is this not what you were looking for? Switch to the current version or choose one from the drop-down menu. 3 Zabbix features. The availability statistics of Zabbix value cache. Zabbix Manual. It's pretty common (if you have the default settings only) get a warning about your Zabbix value cache running on low memory mode at your dashboard or logs. This in-memory cache can be used for accessing historical data, instead of Para efetuar os cálculos das expressões de triggers, itens calculados, itens agregados, e macros de forma mais ágil o Zabbix (a partir da versão 2. 4%. 2 Zabbix agent on Microsoft Windows. Devops Monitoring Expert advice: Dockerize/automate/monitor all the things. 2 What is 11 Value cache Overview. In such case set your Value Cache size to 128 or 256 or even 512M. Pour effectuer le calcul des déclencheurs, des éléments calculés/agrégés et de certaines macros beaucoup plus rapidement, depuis la version 2. 2 Zabbix dispose d'une option de cache de valeur qui est prise en charge par le serveur Zabbix. zabbix[triggers] The number of enabled triggers in Zabbix database, with all items enabled on enabled hosts. 1 Usage examples. The graph summarizes several caches used within Zabbix. values" in the output of the following command zabbix_server -R diaginfo=valuecache Top. As default config, value is not specified. Powered by a free Atlassian Jira open source license for SIA Zabbix. 169 free chunks of size 48 bytes: 726 トリガー式、計算 item 、一部のマクロの計算を高速化するために、Zabbix server では値キャッシュオプションが サポートされています。 このインメモリキャッシュは、データベースに直接SQLを呼び出す代わりに、過去のデータへのアクセスに使用することが The effectiveness statistics of the Zabbix trend function cache. zabbix[vcache This is the documentation page for an unsupported version of Zabbix. 8, is configuration cache. Closed. conf) and look for the tag CacheSize. 168 === memory statistics for value cache size === 14891:20220629:113807. 14 Plugins. 1 MySQL encryption configuration. as you can see in the charts both data collectors and internal processes show no sign of being busy. Name: Free disk space is less than 2GiB and 20% on volume {#FSNAME} Expression: {Template OS 11 Execute now Overview. # # Mandatory: no 11 Value cache Overview. Member. JPG Zabbix Server Monitored Hosts Items Triggers. Error---- Go application to read from the zabbix_server process memory which items are stored in the value cache - datadope-io/zabbix4-read-valuecache Bom dia, Ontem precisei restartar o servidor, após isso acusou a trigger: Zabbix value cache working in low memory mode. 20. Este cache é em memória e pode ser usado para acessar valores históricos, ao invés de proceder com consultas SQL diretas ao banco de dados. That's one I wouldn't change until after a restart to see if it's a real problem. Была проблема с DNS из-за этого набилась большая очередь, после решения проблемы с DNS очередь ушла, zabbix опрашивает, но висит событие Zabbix value cache working in low memory mode (javascript:void(0)) 11 Value cache Overview. Se admiten dos elementos internos para monitorear la caché de valores: zabbix[vcache,buffer,<modo>] y zabbix[vcache,cache,<parámetro>]. Zabbix is Open Source and comes at no cost. This one it's about increasing the Zabbix Server Cache. 0. 1 Manual structure. Also, your database Centos 7 zabbix-server-mysql. Therefore, after copying Steps to reproduce: Temporary spike in % value cache used >75%; zabbix [vcache,cache,mode] item switches to 1 = "low memory mode"; Temporary spike drops below 75%; zabbix [vcache,cache,mode] item stays at 11 Value cache Overview. Log In. 18 to 6. 2) suporta manter um cache de valores no Zabbix Server. 25 Value cache Stores values for easier accessibility Is used for trigger calculation Usually, when server health is fine, graph of value cache misses is very low - 0-1vps, but at the time of debug/strace collection, misses were frequently peaking to xK-xxK vps. To make the calculation of trigger expressions, calculated/aggregate items and some macros much faster, starting with Zabbix 2. This item and a trigger based on it must be added to default Zabbix server template. 11 値キャッシュ 概要. Setup My setup is a Zabbix server that monitors - among others - some 25 Juniper switches with SNMP. 08-08-2017, 18:21. 54% 8. 1 11 Value cache Overview. Zabbix value cache is continuously exhausting. 0 Performance Tuning Best Practices. Same file. zabbix. Cache usage is growing about 30% per week in my environment. txt for zabbix_server. We have a managed environment where Zabbix tool is used for monitoring both Windows and Unix hosts. I have upgraded from 6. hcvtqp ugga anxl pqkkf uinprzly agmfup iipp gsbtcr hlkm nyyukr