[PVE-User] SSD Performance test

[Eneko Lacunza]

Hi Marco,

Thanks for the hint. Fsyncs seem to have improved a little bit:

root at butroe:/mnt# pveperf /srv/storage-local-ssd/
CPU BOGOMIPS:      36176.88
REGEX/SECOND:      761723
HD SIZE:           275.08 GB (/dev/sdc)
BUFFERED READS:    211.47 MB/sec
AVERAGE SEEK TIME: 0.23 ms
FSYNCS/SECOND:     1404.39
DNS EXT:           151.66 ms

Cheers
Eneko

On 17/09/13 12:21, Marco Gabriel - inett GmbH wrote:
> For SSDs you should set the I/O scheduler to "NOOP". Proxmox uses Deadline by default, which is good for spinning disks, but not for SSDs.
>
> Examples (ssd is sdb):
>
> Get currently used scheduler:
>      cat /sys/block/sdb/queue/scheduler
>      noop anticipatory [deadline] cfq
>
> Set scheduler:
>      echo noop > /sys/block/sdb/queue/scheduler
>
> best regards,
> Marco
>
>
> -----Ursprüngliche Nachricht-----
> Von: pve-user-bounces at pve.proxmox.com [mailto:pve-user-bounces at pve.proxmox.com] Im Auftrag von Eneko Lacunza
> Gesendet: Dienstag, 17. September 2013 12:12
> An: pve-user at pve.proxmox.com
> Betreff: [PVE-User] SSD Performance test
>
> Hi all,
>
> I'm doing some tests with a Intel SSD 320 300GB disk. This is a 3 Gbps disk with max ratings of R/W 270/205 MB/s and 39500/23000-400 IOPS.
>
> The disk is attached to a Dell PERC H200 (LSI SAS2008) RAID controller, no raid, no logical volume, no cache and is mounted as "ext4 (rw,relatime,barrier=1,data=ordered)"
>
> root at butroe:~# pveperf /srv/storage-local-ssd/
> CPU BOGOMIPS:      36176.88
> REGEX/SECOND:      761809
> HD SIZE:           275.08 GB (/dev/sdc)
> BUFFERED READS:    211.87 MB/sec
> AVERAGE SEEK TIME: 0.23 ms
> FSYNCS/SECOND:     1373.42
> DNS EXT:           157.35 ms
>
> I was expecting a better Fsync/second value, having seen on this list much better values with spinning disk RAIDs and taking into account this drive's IOPS rating.
>
> What do you think? Maybe it's the lack of a controller write cache what is hurting the fsyncs and the value is good with a H200 controller?
>
> Thanks
> Eneko
>
> --
> Zuzendari Teknikoa / Director Técnico
> Binovo IT Human Project, S.L.
> Telf. 943575997
>         943493611
> Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa) www.binovo.es
>
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-- 
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943575997
       943493611
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
www.binovo.es