[PVE-User] SSD Performance test

Michael Rasmussen mir at miras.org
Tue Sep 17 12:38:49 CEST 2013


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
>
>
>-----Urspr√ľngliche 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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