Hello Community
Happy Valentines Day ;-)
I need some advice on using EXATA RAM on my OSD servers to improve Ceph's
write performance.
I have 20 OSD servers each with 256GB RAM and 6TB x 16 OSD's, so assuming
cluster is not recovering, most of the time system will have at least
~150GB RAM free. A
Won't be used for write : write are synced (meaning: write it to disk, now)
On 14/02/2016 10:55, Vickey Singh wrote:
> Hello Community
>
> Happy Valentines Day ;-)
>
> I need some advice on using EXATA RAM on my OSD servers to improve Ceph's
> write performance.
>
> I have 20 OSD servers each w
To be clear when you are restarting these osds how many pgs go into peering
state? And do they stay there for the full 3 minutes? Certainly I've seen
iops drop to zero or near zero when a large number of pgs are peering. It
would be wonderful if we could keep iops flowing even when pgs are
peeri
Hi all,
the vote for presentation period for the Austin Summit ends on 17th
February, 11:59 PST (18th February 7:59 UTC / 08:59 CEST). Here a list
of some very interesting and Ceph related presentation proposals waiting
for your vote (shorted urls point to the OpenStack voting page)!
I'm sure eve
I doubt it will do much good in case of 100% write workload. You can tweak your
VM dirty ration stuff to help the buffered write but the down side is the more
amount of data it has to sync (while dumping dirty buffer eventually) the more
spikiness it will induce..The write behavior won’t be smoo
Hello,
I am using ceph hammer under proxmox.
I have working cluster it is several month I am using it.
For reasons yet to discover I am now in this situation:
HEALTH_WARN 4 pgs incomplete; 4 pgs stuck inactive; 4 pgs stuck unclean; 7
requests are blocked > 32 sec; 1 osds have slow requests
pg 0.
Hello,
As Somnath writes below, RAM will only indirectly benefit writes.
But with the right tuning to keep dentry and other FS related caches in
the SLAB it can help a lot.
As will all the really hot objects that get read frequently and still fit
in the pagecache of your storage nodes, as anothe
Hello,
Wall of text, paragraphs make for better reading. ^_-
On Sun, 14 Feb 2016 06:25:11 -0700 Tom Christensen wrote:
> To be clear when you are restarting these osds how many pgs go into
> peering state? And do they stay there for the full 3 minutes?
>
I can't say that with anything resembli
Hello Mario,
This kind of problem usually happens for following reasons:
1-) One of the OSD nodes has network problem.
2-) Disk failure
3-) Not enough resource for OSD nodes
4-) Slow OSD Disks
This happened before me. The problem was network cable problem. As soon as
I replaced the cable, everyt
Have you tried restarting osd.0 ?
-K.
On 02/14/2016 09:56 PM, Mario Giammarco wrote:
> Hello,
> I am using ceph hammer under proxmox.
> I have working cluster it is several month I am using it.
> For reasons yet to discover I am now in this situation:
>
> HEALTH_WARN 4 pgs incomplete; 4 pgs st
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