Hi Marco,
Thanks for the hint. Fsyncs seem to have improved a little bit:
root@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-boun...@pve.proxmox.com [mailto:pve-user-boun...@pve.proxmox.com]
Im Auftrag von Eneko Lacunza
Gesendet: Dienstag, 17. September 2013 12:12
An: pve-user@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@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
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