FWIW, we run into this same issue, and cannot get a good enough SSD:
spinning ratio, and decided on simply running the journals on each
(spinning) drive, for hosts that have 24 slots. The problem gets even
worse when we're talking about some of the newer boxes.
Warren
Warren
On Wed, Sep 18, 20
Joseph,
With properly architected failure domains and replication in a Ceph
cluster, RAID1 has diminishing returns.
A well-designed CRUSH map should allow for failures at any level of your
hierarchy (OSDs, hosts, racks, rows, etc) while protecting the data with
a configurable number of copie
>-Original Message-
>From: ceph-users-boun...@lists.ceph.com [mailto:ceph-users-
>boun...@lists.ceph.com] On Behalf Of Mike Dawson
>
> you need to understand losing an SSD will cause
>the loss of ALL of the OSDs which had their journal on the failed SSD.
>
>First, you probably don't want
Am 18.09.2013 17:03, schrieb Mike Dawson:
I think you'll be OK on CPU and RAM.
I'm running latest dumpling here and with default settings each osd consumes
more than 3 GB RAM peak. So with 48 GB RAM it would not be possible to run the
desired 18 osds. I filed a bug report for this here
htt
Dell - Internal Use - Confidential
Thanks Mike, great info!
-Original Message-
From: Mike Dawson [mailto:mike.daw...@cloudapt.com]
Sent: 18 September 2013 16:04
To: Porter, Ian M; ceph-users@lists.ceph.com
Subject: Re: [ceph-users] OSD and Journal Files
Ian,
There are two schools of
Excellent overview Mike!
Mark
On 09/18/2013 10:03 AM, Mike Dawson wrote:
Ian,
There are two schools of thought here. Some people say, run the journal
on a separate partition on the spinner alongside the OSD partition, and
don't mess with SSDs for journals. This may be the best practice for an
Ian,
There are two schools of thought here. Some people say, run the journal
on a separate partition on the spinner alongside the OSD partition, and
don't mess with SSDs for journals. This may be the best practice for an
architecture of high-density chassis.
The other design is to use SSDs f
Dell - Internal Use - Confidential
Hi,
I read in the ceph documentation that one of the main performance snags in ceph
was running the OSDs and journal files on the same disks and you should
consider at a minimum running the journals on SSDs.
Given I am looking to design a 150 TB cluster, I'm c
