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

[Alexandre DERUMIER]

>>FSYNCS/SECOND:     0.40

If you have launched pveperf when your server was already busy, 
that mean that you already use your disk at 100%

without any raid cache, you should have around 150FSYNC/S pour 7200rpm disk

look at "#iostat -x"


----- Mail original -----
De: "Gerald Brandt" <gbr at majentis.com>
À: "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Vendredi 17 Juin 2016 15:10:45
Objet: Re: [PVE-User] about IO Delay using openvz and zimbra

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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