[pve-devel] ceph firefly in pve repos

[Alexandre DERUMIER]

results of fio on rbd with kernel patch



fio rbd crucial m550 1 osd 0.85 (osd_enable_op_tracker true or false, same result): 
--------------------------- 
bw=12327KB/s, iops=3081 

So no much better than before, but this time, iostat show only 15% utils, and latencies are lower 

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util 
sdb 0,00 29,00 0,00 3075,00 0,00 36748,50 23,90 0,29 0,10 0,00 0,10 0,05 15,20 


So, the write bottleneck seem to be in ceph. 



I will send s3500 result today 


----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag>, "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Vendredi 12 Septembre 2014 08:05:30 
Objet: RE: [pve-devel] ceph firefly in pve repos 

> > I thought that would be handled by the SSD drive internally? If there 
> > is a capicitor, the SSD can acknowledge the write immediately (write back 
> cache)? 
> 
> Some do and some do not. It depends on the firmware and the drive. 
> 
> For example the intel 520 drives ignored the command even they do NOT have a 
> capicitor. 
> 
> Intel S3700 do not ignore the command but they have a capicitor. 
> 
> > Please can you point me to your patch? (do you have a link) 
> 
> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013- 
> November/035707.html 

@Stefan: and you think this is safe to use with crucial MX100 SSDs?