Hi,
It's firefly 0.80.9, so if the improvement is in Hammer I haven't seen it.
Will check back when I upgrade the cluster.
Thanks
Eneko
On 26/05/15 17:45, Robert LeBlanc wrote:
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What version of Ceph are you using? I seem to remember an enhancement
of ceph-disk for Hammer that is more aggressive in reusing previous
partition.
- ----------------
Robert LeBlanc
GPG Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Mon, May 25, 2015 at 4:22 AM, Eneko Lacunza wrote:
Hi all,
We have a firefly ceph cluster (using Promxox VE, but I don't think this is
revelant), and found a OSD disk was having quite a high amount of errors as
reported by SMART, and also quite high wait time as reported by munin, so we
decided to replace it.
What I have done is down/out the osd, then remove it (removing partitions).
Replace the disk and create a new OSD, which was created with the same ID as
the removed one (as I was hoping to not change CRUSH map).
So everything has worked as expected, except one minor non-issue:
- Original OSD journal was on a separate SSD disk, which had partitions #1
and #2 (journals of 2 OSDs).
- Original journal partition (#1) was removed
- A new partition has been created as #1, but has been assigned space after
the last existing partition. So there is now hole of 5GB in the beginning of
SSD disk. Promox is using ceph-disk prepare for this, I seen in the docs
(http://ceph.com/docs/master/man/8/ceph-disk/) that ceph-disk prepare
creates a new partition in the journal block device.
What I'm afraid is that given enough OSD replacements, Proxmox wouldn't find
free space for new journals in that SSD disk? Although there would be plenty
in the beginning?
Maybe the journal-partition creation can be improved so that it can detect
free space also in the beginning and between existing partitions?
Cheers
Eneko
--
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943575997
943493611
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
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--
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943575997
943493611
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
www.binovo.es
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