[PVE-User] about IO Delay using openvz and zimbra

[Fabrizio Cuseo]

Hello.
First, please say "hello" to Havana... i miss Cuba (my only time in cuba, 2 years ago, habana, trinidad, vinales).

Regarding your problem: can you describe better your cluster configuration ? Which kind of storage (both local and shared) are you using ? RAID-1 disks are software or hardware raid ? Do you have a controller with cache memory and backup battery ? 

Why have you choosen to have only a container with local storage (and not a VM with shared storage) for zimbra installation ? 
If you have a very busy zimbra server, you will have a lot of disk I/O activity, and hardware requirements are growing for last zimbra releases (8.6). You can try to monitor your container activity with both "sar" and "dstat".

Regards, Fabrizio 


----- Il 17-giu-16, alle 4:38, Orlando Martinez Bao ombao at unah.edu.cu ha scritto:

> Hello friends
> 
> I am SysAdmin at the Agrarian University of Havana, Cuba.
> 
> 
> 
> I have installed Proxmox v3.4 here a cluster of seven nodes and for some
> days I am having problems with a node in the cluster which only has a
> Container with Zimbra 8.
> 
> The problem is I'm having a lot of I / O Delay and that server is very slow
> to the point that sometimes the service is down.
> 
> The server is PowerEdge T320 Dell with Intel Xeon E5-2420 12gram with 12
> cores and 1GB of disk 7200RPM 2xHDD are configured as RAID1.
> 
> I have virtualizing the zimbra 8 using a template of 12.04, has 8 cores, 8G
> RAM, 500GHD the storage of container is local storage.
> 
> Then I put the output to see the IO when you are not running the VM. Look at
> the BUFFERED READS that are marked are very bad. And those moments have seen
> IO Delay up to 50%.
> 
> 
> 
> root at n07:~# pveperf
> 
> CPU BOGOMIPS:      45601.20
> 
> REGEX/SECOND:      1025079
> 
> HD SIZE:           9.84 GB (/dev/mapper/pve-root)
> 
> BUFFERED READS:    1.51 MB/sec
> 
> AVERAGE SEEK TIME: 165.88 ms
> 
> FSYNCS/SECOND:     0.40
> 
> DNS EXT:           206.20 ms
> 
> DNS INT:           0.91 ms (unah.edu.cu)
> 
> root at n07:~# pveperf
> 
> CPU BOGOMIPS:      45601.20
> 
> REGEX/SECOND:      1048361
> 
> HD SIZE:           9.84 GB (/dev/mapper/pve-root)
> 
> BUFFERED READS:    0.78 MB/sec
> 
> AVERAGE SEEK TIME: 283.84 ms
> 
> FSYNCS/SECOND:     0.50
> 
> DNS EXT:           206.13 ms
> 
> DNS INT:           0.89 ms (unah.edu.cu)
> 
> root at n07:~# pveperf (Este fue cuando detuve la VM)
> 
> CPU BOGOMIPS:      45601.20
> 
> REGEX/SECOND:      1073712
> 
> HD SIZE:           9.84 GB (/dev/mapper/pve-root)
> 
> BUFFERED READS:    113.04 MB/sec
> 
> AVERAGE SEEK TIME: 13.49 ms
> 
> FSYNCS/SECOND:     9.66
> 
> DNS EXT:           198.59 ms
> 
> DNS INT:           0.86 ms (unah.edu.cu)
> 
> root at n07:~# pveperf
> 
> CPU BOGOMIPS:      45601.20
> 
> REGEX/SECOND:      1024213
> 
> HD SIZE:           9.84 GB (/dev/mapper/pve-root)
> 
> BUFFERED READS:    164.30 MB/sec
> 
> AVERAGE SEEK TIME: 13.61 ms
> 
> FSYNCS/SECOND:     16.34
> 
> DNS EXT:           234.75 ms
> 
> DNS INT:           0.94 ms (unah.edu.cu)
> 
> 
> 
> 
> 
> Please help me.
> 
> Best Regards
> 
> Orlando
> 
> 
> 
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-- 
---
Fabrizio Cuseo - mailto:f.cuseo at panservice.it
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