Hi All,
Could someone please sanity check this for me please. I trying to get my
head round what counter reflect what and how they correlate to end user
performance.
In the attached graph I am graphing averages of the counters across all
OSD's on one host
Blue = osd.w_op_latency
Red = Max of abo
Hello Kevin,
On Wed, 25 Feb 2015 07:55:34 +0400 Kevin Walker wrote:
> Hi Christian
>
> We are just looking at options at this stage.
>
Never a bad thing to do.
> Using a hardware RAM disk for the journal is the same concept as the
> SolidFire guys, who are also using XFS (at least they were
Hi Christian
We are just looking at options at this stage.
Using a hardware RAM disk for the journal is the same concept as the SolidFire
guys, who are also using XFS (at least they were last time I crossed paths with
a customer using SolidFire) and from my experiences with ZFS, using a RAM ba
On Wed, 25 Feb 2015 02:50:59 +0400 Kevin Walker wrote:
> Hi Mark
>
> Thanks for the info, 22k is not bad, but still massively below what a
> pcie ssd can achieve. Care to expand on why the write IOPS are so low?
Aside from what Mark mentioned in his reply there's also latency to be
considered in
Hi Kevin,
Writes are probably limited by a combination of locks, concurrent
O_DSYNC journal writes, fsyncs, etc. The tests I mentioned were with
both the OSD and the OSD journal on the same PCIe SSD. Others have
looked into this in more detail than I have so might be able to chime
in with
Hi Mark
Thanks for the info, 22k is not bad, but still massively below what a pcie ssd
can achieve. Care to expand on why the write IOPS are so low? Was this with a
separate RAM disk pcie device or SLC SSD for the journal?
That fragmentation percentage looks good. We are considering using just
On 02/24/2015 04:21 PM, Kevin Walker wrote:
Hi All
Just recently joined the list and have been reading/learning about ceph
for the past few months. Overall it looks to be well suited to our cloud
platform but I have stumbled across a few worrying items that hopefully
you guys can clarify the sta
Hi All
Just recently joined the list and have been reading/learning about ceph for
the past few months. Overall it looks to be well suited to our cloud
platform but I have stumbled across a few worrying items that hopefully you
guys can clarify the status of.
Reading through various mailing list
