Re: [ceph-users] Write IO Problem

I can not reproduce the snapshot issue with BTRFS on the 3.17 kernel. My test cluster had 48 btrfs OSDs on BTRFS for four months without an issue since going to 3.17. The only concern I have is potential slowness over time. We are not using compression. We are going production in one month and

Re: [ceph-users] Write IO Problem

Hello, On Tue, 24 Mar 2015 07:43:00 + Rottmann Jonas wrote: Hi, First of all, thank you for your detailed answer. My Ceph Version is Hammer, sry should have mentioned that. Yes we have 2 Intel 320 for the OS, the think process behind this was that the OS Disk is not that

Re: [ceph-users] Write IO Problem

On Tue, 24 Mar 2015 07:24:05 -0600 Robert LeBlanc wrote: I can not reproduce the snapshot issue with BTRFS on the 3.17 kernel. Good to know. I shall give that a spin on one of my test cluster nodes then, once a kernel over 3.16 actually shows up in Debian sid. ^o^ Christian My test cluster

Re: [ceph-users] Write IO Problem

Hi, dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc 1073741824 Bytes (1,1 GB) kopiert, 2,53986 s, 423 MB/s How much do you get with o_dsync? (ceph journal use o_dsync, and some ssd are pretty slow with dsync)

Re: [ceph-users] Write IO Problem

=false change the results ? How many iops do you see with #ceph -w ? - Mail original - De: Christian Balzer ch...@gol.com À: ceph-users ceph-us...@ceph.com Cc: aderumier aderum...@odiso.com Envoyé: Mardi 24 Mars 2015 08:24:23 Objet: Re: [ceph-users] Write IO Problem On Tue, 24 Mar 2015

Re: [ceph-users] Write IO Problem

Objet: Re: [ceph-users] Write IO Problem On Tue, 24 Mar 2015 07:56:33 +0100 (CET) Alexandre DERUMIER wrote: Hi, dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc 1073741824 Bytes (1,1 GB) kopiert, 2,53986 s, 423 MB/s How much do you get with o_dsync

Re: [ceph-users] Write IO Problem

On Tue, 24 Mar 2015 07:56:33 +0100 (CET) Alexandre DERUMIER wrote: Hi, dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc 1073741824 Bytes (1,1 GB) kopiert, 2,53986 s, 423 MB/s How much do you get with o_dsync? (ceph journal use o_dsync, and some ssd are pretty slow

Re: [ceph-users] Write IO Problem

Schweinfurt HRB 3865 -Ursprüngliche Nachricht- Von: Alexandre DERUMIER [mailto:aderum...@odiso.com] Gesendet: Dienstag, 24. März 2015 07:57 An: Rottmann Jonas Cc: ceph-users Betreff: Re: [ceph-users] Write IO Problem Hi, dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync

Re: [ceph-users] Write IO Problem

Hello, If you had used performance or slow in your subject future generations would be able find this thread and what it is about more easily. ^_- Also, check the various SSD + performance threads in the ML archives. On Fri, 20 Mar 2015 14:13:19 + Rottmann Jonas wrote: Hi, We have a