<html><head></head><body>Also barrier=0<br><br><div class="gmail_quote">Marco Gabriel - inett GmbH <mgabriel@inett.de> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">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.<br /><br />Examples (ssd is sdb): <br /><br />Get currently used scheduler:<br />cat /sys/block/sdb/queue/scheduler<br />noop anticipatory [deadline] cfq<br /><br />Set scheduler:<br />echo noop > /sys/block/sdb/queue/scheduler<br /><br />best regards,<br />Marco<br /><br /><br />-----Ursprüngliche Nachricht-----<br />Von: pve-user-bounces@pve.proxmox.com [mailto:pve-user-bounces@pve.proxmox.com] Im Auftrag von Eneko Lacunza<br />Gesendet: Dienstag, 17. September 2013 12:12<br />An: pve-user@pve.proxmox.com<br />Betreff: [PVE-User] SSD Performance test<br /><br />Hi all,<br /><br />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.<br /><br />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)"<br /><br />root@butroe:~# pveperf /srv/storage-local-ssd/<br />CPU BOGOMIPS: 36176.88<br />REGEX/SECOND: 761809<br />HD SIZE: 275.08 GB (/dev/sdc)<br />BUFFERED READS: 211.87 MB/sec<br />AVERAGE SEEK TIME: 0.23 ms<br />FSYNCS/SECOND: 1373.42<br />DNS EXT: 157.35 ms<br /><br />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.<br /><br />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?<br /><br />Thanks<br />Eneko<br /><br />--<br />Zuzendari Teknikoa / Director Técnico<br />Binovo IT Human Project, S.L.<br />Telf. 943575997<br />943493611<br />Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa) <a href="http://www.binovo.es">www.binovo.es</a><br
/><br /><hr /><br />pve-user mailing list<br />pve-user@pve.proxmox.com<br /><a href="http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user">http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user</a><br /><br /><hr /><br />pve-user mailing list<br />pve-user@pve.proxmox.com<br /><a href="http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user">http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user</a><br /><br />!DSPAM:52382d67173671703778415!<br /><br /><br /></pre></blockquote></div><br>
-- <br>
Sent from my Android phone with K-9 Mail. Please excuse my brevity.</body></html>