Re: [ceph-users] SSD pool write performance

2013-10-11 Thread james
Just a thought; did you try setting noop scheduler for the SSDs? I guess the journal is written uncached (?) So maybe sticking the SSDs behind BBWC might help by reducing write latency to near zero. Also maybe wear rate might be lower on the SSD too (if journal IO straddles physical cells).

Re: [ceph-users] SSD pool write performance

2013-10-11 Thread Gregory Farnum
On Thu, Oct 10, 2013 at 12:47 PM, Sergey Pimkov wrote: > Hello! > > I'm testing small CEPH pool consists of some SSD drives (without any > spinners). Ceph version is 0.67.4. Seems like write performance of this > configuration is not so good as possible, when I testing it with small block > size

Re: [ceph-users] SSD pool write performance

2013-10-11 Thread Andrei Mikhailovsky
Thursday, 10 October, 2013 8:47:32 PM Subject: [ceph-users] SSD pool write performance Hello! I'm testing small CEPH pool consists of some SSD drives (without any spinners). Ceph version is 0.67.4. Seems like write performance of this configuration is not so good as possible, when

Re: [ceph-users] SSD pool write performance

2013-10-11 Thread Mark Nelson
On 10/10/2013 02:47 PM, Sergey Pimkov wrote: Hello! I'm testing small CEPH pool consists of some SSD drives (without any spinners). Ceph version is 0.67.4. Seems like write performance of this configuration is not so good as possible, when I testing it with small block size (4k). Pool configur

[ceph-users] SSD pool write performance

2013-10-10 Thread Sergey Pimkov
Hello! I'm testing small CEPH pool consists of some SSD drives (without any spinners). Ceph version is 0.67.4. Seems like write performance of this configuration is not so good as possible, when I testing it with small block size (4k). Pool configuration: 2 mons on separated hosts, one host