Re: Ceph Design

["SUNDAY A. OLUTAYO" <olutayo@xxxxxxxxxx>]

I intend to have 5-8 OSDs for 400GB SSD.

Should there be different partitions for each OSD on the SSD?

 

Thanks,

Sunday Olutayo

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From: "Dominik Zalewski" <dzalewski@xxxxxxxxxxxxx>
To: "SUNDAY A. OLUTAYO" <olutayo@xxxxxxxxxx>, "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Sent: Wednesday, August 5, 2015 3:38:20 PM
Subject: Re: Ceph Design

I would suggest splitting OSDs across two or more SSD journals (depending on OSD write speed and SSD sustained speed limits) 

e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 OSDs (it may vary depending on the setup)

If you RAID-1 SSD journals they will potentially "wear out" in the same time due to writes happening on both of them.

You only going to get journal write performance penalty with RAID-1.

Dominik

On Wed, Aug 5, 2015 at 3:37 PM, Dominik Zalewski <dzalewski@xxxxxxxxxxxxx> wrote:

I would suggest splitting OSDs across two or more SSD journals (depending on OSD write speed and SSD sustained speed limits) 

e.g 2x Intel S3700 400GB for 8-10 OSDs or 4x Intel S3500 300GB for 8-10 OSDs (it may vary depending on the setup)

If you RAID-1 SSD journals they will potentially "wear out" in the same time due to writes happening on both of them.

You only going to get journal write performance penalty with RAID-1.

Dominik

On Tue, Aug 4, 2015 at 10:54 PM, SUNDAY A. OLUTAYO <olutayo@xxxxxxxxxx> wrote:

I am thinking of having ceph journal on a RAID1 SSD.

Kindly advise me on this, does the RAID1 SSD for journal make sense?

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