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Revision as of 18:26, 10 March 2009


Zmstats is how Zimbra exposes its performance metrics and statistics to the world. The information covers a wide array of data: disk usage, cpu utilization, java statistics, zimbra counters and beyond.

Zmstats consists of the following components and scripts:

  • zmstatctl
    • zmstat-fd
    • zmstat-df
    • zmstat-cpu
    • zmstat-proc
    • zmstat-io
    • zmstat-vm
    • zmstat-convertd
    • zmstat-mtaqueue
    • zmstat-mysql
  • zmstat-chart
    • zmstat-chart-config


zmstatctl is used to start and stop and various zmstat-* data logging scripts


zmstat-chart reads an XML configuration file generated by zmstat-chart-config and generates a set of HTML and PNG graph images suitable for rapidly diagnosing problems and load issues.


Used to control what is graphed and how


 <chart title="Mailboxd: JVM Heap Used"
   <plot data="heap_used" legend="total" divisor="1m"/>

The above defines a chart that reads the counter "heap_used" out of mailboxd.csv. It takes that counter and graphs it to a file "mboxd-heap-used.png". There will be a resulting graph with a yAxis labelled "MB" and "heap_used" divided by 1million (megabytes) will be graphed over time.

Multiple plots can be placed onto a single chart through the use of additional <plot> elements.

See /opt/zimbra/conf/zmstat-chart.xml for more examples

Individual stat scripts and their related counters

zmstat-fd: fd.csv

Captures file descriptor usage on the system

  • fd_count: current number of open file descriptors

zmstat-df: df.csv

Captures disk usage

  • path: mount point
  • disk: device
  • disk_use: space used
  • disk_pct_used: percentage used
  • disk_space: total space

zmstat-cpu: cpu.csv

  • cpu:user: total user time
  • cpu:nice: total nice process time
  • cpu:sys: total system time
  • cpu:idle: total idle time
  • cpu:iowait: total time in iowait
  • cpu:irq: total time in irq
  • cpu:softirq: total time in softirq
  • cpuN:XXX: same as above, but per individual core/cpu

zmstat-io: io.csv and io-x.csv

  • dev:tps: transactions per second
  • dev:kB_read/s: read rate
  • dev:kB_wrtn/s: write rate
  • dev:kB_read: bytes read
  • dev:kB_wrtn: bytes written
  • dev:rrqm/s: read requests merged per second queued to device
  • dev:wrqm/s: write requests merged per second queued to device
  • dev:r/s: reads per second
  • dev:w/s: writes per second
  • dev:rkB/s read rate
  • dev:wkB/s: write rate
  • dev:avgrq-sz: average size (sectors) of requests
  • dev:avgqu-sz: average queue length
  • dev:await: average wait time for requests to be served
  • dev:svctm: average time to service requests
  • dev:%util: percentage of CPU time / bandwidth utilization of device

zmstat-proc: proc.csv

  • user: total user time
  • sys: total system time
  • idle: total idle time
  • iowait: total iowait time
  • PROC-total-cpu: total cpu usage for PROC
  • PROC-utime: usertime for PROC
  • PROC-stime: system time for PROC
  • PROC-totalMB: total memory footprint for PROC
  • PROC-rssMB: resident-set-size of PROC
  • PROC-sharedMB: shared memory of PROC
  • PROC-process-count: number of threads/subprocesses

zmstat-vm: vm.csv

The output of vmstat(1) is recorded for reviewable statistics.

  • r:
  • b:
  • swpd:
  • free:
  • buff:
  • cache:
  • si:
  • so:
  • bi:
  • bo:
  • in:
  • cs:
  • us:
  • sy:
  • id:
  • wa:
  • st:
  • ...: other counters reported by vmstat
Verified Against: unknown Date Created: 3/07/2009
Article ID: https://wiki.zimbra.com/index.php?title=Zmstats Date Modified: 2009-03-10

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