[PVE-User] SSD Performance test

Eneko Lacunza elacunza at binovo.es
Tue Sep 17 13:20:47 CEST 2013


Hi Michale,

That would risk the data in case of a power failure doesn't it? (yes, 
server is UPS backed... :)  )


On 17/09/13 12:38, Michael Rasmussen wrote:
> Also barrier=0
>
> Marco Gabriel - inett GmbH <mgabriel at inett.de> 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
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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

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