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

[Fabrizio Cuseo]

Right (i missed them).
You need better disk/controller.
This is one "old" node, dell 2950, with 2 x sata (raid-1 with perc5i 256Mb cache and BBU).
Using cached and BBU controllers, you can gain in fsyncs/second.

root at proxmox-1:~# pveperf
CPU BOGOMIPS:      37241.04
REGEX/SECOND:      923558
HD SIZE:           57.09 GB (/dev/mapper/pve-root)
BUFFERED READS:    50.14 MB/sec
AVERAGE SEEK TIME: 13.42 ms
FSYNCS/SECOND:     699.46
DNS EXT:           12.05 ms
DNS INT:           21.70 ms ()




----- Il 17-giu-16, alle 15:10, Gerald Brandt gbr at majentis.com ha scritto:

> Hi,
> 
> Your fsyncs per second are brutal, and Proxmox needs high fsyncs. I
> would start there.
> 
> Gerald
> 
> 
> On 2016-06-16 09:38 PM, Orlando Martinez Bao wrote:
>> 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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> 
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-- 
---
Fabrizio Cuseo - mailto:f.cuseo at panservice.it
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