[pve-devel] ceph firefly in pve repos

[Alexandre DERUMIER]

I'm going to test s3500 today.

Seem to be a lot better for dsync

~#  dd if=rand.file of=/dev/sdb bs=4k count=65536 oflag=dsync,direct
65536+0 enregistrements lus
65536+0 enregistrements écrits
268435456 octets (268 MB) copiés, 7,41574 s, 36,2 MB/s


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

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Jeudi 11 Septembre 2014 17:59:56 
Objet: RE: [pve-devel] ceph firefly in pve repos 

> > # dd if=rand.file of=/dev/sdb bs=4k count=65536 oflag=dsync,direct 
> > ^C17228+0 enregistrements lus 
> > 17228+0 enregistrements écrits 
> > 70565888 octets (71 MB) copiés, 70,4098 s, 1,0 MB/s 
> 
> That is about 250 IOPS? 

Or in other words, this is 4ms access time (same as a fast SAS disk with 10000RPM). 
Unfortunately, they already have higher prices ;-)