On 08/30/2013 01:47 PM, Dimitri Maziuk wrote:
On 08/30/2013 01:38 PM, Geraint Jones wrote:
On 30/08/13 11:33 AM, "Wido den Hollander" <wido@xxxxxxxx> wrote:
On 08/30/2013 08:19 PM, Geraint Jones wrote:
Hi Guys
We are using Ceph in production backing an LXC cluster. The setup is : 2
x Servers, 24 x 3TB Disks each in groups of 3 as RAID0. SSD for
journals. Bonded 1gbit ethernet (2gbit total).
I think you sized your machines too big. I'd say go for 6 machines with
8 disks each without RAID-0. Let Ceph do it's job and avoid RAID.
Typical traffic is fine - its just been an issue tonight :)
If you hosed and have to recover an 9TB filesystem, you'll have problems
no matter what, ceph or no ceph. You *will* have a disk failure every
once in a while, and there's no "r" in raid-0, so don't think what
happened is not typical.
(There's nothing wrong with raid as long it's >0.)
One exception: Some controllers (looking at you LSI!) don't expose disks
as JBOD or if they do, don't let you use write-back cache. In those
cases we some times have people make single-disk RAID0 LUNs. :)
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