Samsung Evo Pro is not an Enterprise class SSD. A quick search of the ML will allow which SSDs people are using.
As was already suggested, the better option is an HBA as opposed to a raid controller. If you are set on your controllers, write-back is fine as long as you have BBU. Otherwise you should be using write-through.
On Thu, Sep 6, 2018, 8:54 AM Muhammad Junaid <junaid.fsd.pk@xxxxxxxxx> wrote:
Thanks. Can you please clarify, if we use any other enterprise class SSD for journal, should we enable write-back caching available on raid controller for journal device or connect it as write through. Regards._______________________________________________On Thu, Sep 6, 2018 at 4:50 PM Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote:
Do not use Samsung 850 PRO for journal
Just use LSI logic HBA (eg. SAS2308)
-----Original Message-----
From: Muhammad Junaid [mailto:junaid.fsd.pk@xxxxxxxxx]
Sent: donderdag 6 september 2018 13:18
To: ceph-users@xxxxxxxxxxxxxx
Subject: help needed
Hi there
Hope, every one will be fine. I need an urgent help in ceph cluster
design. We are planning 3 OSD node cluster in the beginning. Details are
as under:
Servers: 3 * DELL R720xd
OS Drives: 2 2.5" SSD
OSD Drives: 10 3.5" SAS 7200rpm 3/4 TB
Journal Drives: 2 SSD's Samsung 850 PRO 256GB each Raid controller: PERC
H710 (512MB Cache) OSD Drives: On raid0 mode Journal Drives: JBOD Mode
Rocks db: On same Journal drives
My question is: is this setup good for a start? And critical question
is: should we enable write back caching on controller for Journal
drives? Pls suggest. Thanks in advance. Regards.
Muhammad Junaid
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