Hi Hugo,
On 21 Aug 2014, at 14:17, Hugo Mills wrote:
>
> Not sure what you mean about colocated journal/OSD. The journals
> aren't on the same device as the OSDs. However, all three journals on
> each machine are on the same SSD.
I obviously didn’t drink enough coffee this morning. I read y
On Thu, Aug 21, 2014 at 07:40:45AM +, Dan Van Der Ster wrote:
> On 20 Aug 2014, at 17:54, Hugo Mills wrote:
> >> Does your hardware provide enough IOPS for what your users need?
> >> (e.g. what is the op/s from ceph -w)
> >
> > Not really an answer to your question, but: Before the ceph clu
Just to fill in some of the gaps from yesterday's mail:
On Wed, Aug 20, 2014 at 04:54:28PM +0100, Hugo Mills wrote:
>Some questions below I can't answer immediately, but I'll spend
> tomorrow morning irritating people by triggering these events (I think
> I have a reproducer -- unpacking a
Hi Hugo,
On 20 Aug 2014, at 17:54, Hugo Mills wrote:
>> What are you using for OSD journals?
>
> On each machine, the three OSD journals live on the same ext4
> filesystem on an SSD, which is also the root filesystem of the
> machine.
>
>> Also check the CPU usage for the mons and osds...
>
Hello,
On Wed, 20 Aug 2014 15:39:11 +0100 Hugo Mills wrote:
>We have a ceph system here, and we're seeing performance regularly
> descend into unusability for periods of minutes at a time (or longer).
> This appears to be triggered by writing large numbers of small files.
>
>Specificati
ugo Mills"
To: "Dan Van Der Ster"
Cc: "Ceph Users List"
Sent: Wednesday, 20 August, 2014 4:54:28 PM
Subject: Re: [ceph-users] Serious performance problems with small file writes
Hi, Dan,
Some questions below I can't answer immediately, but I'll spend
Hi, Dan,
Some questions below I can't answer immediately, but I'll spend
tomorrow morning irritating people by triggering these events (I think
I have a reproducer -- unpacking a 1.2 GiB tarball with 25 small
files in it) and giving you more details. For the ones I can answer
right now:
Hi,
On 20 Aug 2014, at 16:55, German Anders
mailto:gand...@despegar.com>> wrote:
Hi Dan,
How are you? I want to know how you disable the indexing on the
/var/lib/ceph OSDs?
# grep ceph /etc/updatedb.conf
PRUNEPATHS = "/afs /media /net /sfs /tmp /udev /var/cache/ccache
/var/spool/cups
Hi,
Do you get slow requests during the slowness incidents? What about monitor
elections?
Are your MDSs using a lot of CPU? did you try tuning anything in the MDS (I
think the default config is still conservative, and there are options to cache
more entries, etc…)
What about iostat on the OSDs
We have a ceph system here, and we're seeing performance regularly
descend into unusability for periods of minutes at a time (or longer).
This appears to be triggered by writing large numbers of small files.
Specifications:
ceph 0.80.5
6 machines running 3 OSDs each (one 4 TB rotational HD
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