Re: SSD Journal Best Practice

["lidchen@xxxxxxxxxx" <lidchen@xxxxxxxxxx>]

For the first choice:

     ceph-deploy osd create ceph-node:sdb:/dev/ssd ceph-node:sdc:/dev/ssd

i find ceph-deploy will create partition automaticaly, and each partition is 5G default.

So the first choice and second choice is almost the same.

Compare to filesystem, I perfer to block device to get more better performance. 

 

From: lidchen@xxxxxxxxxx

Date: 2015-01-12 12:35

To: ceph-users@xxxxxxxx

Subject: SSD Journal Best Practice

Hi everyone:

      I plan to use SSD Journal to improve performance.

      I have one 1.2T SSD disk per server.

      what is the best practice for SSD Journal ?

      There are there choice to deploy SSD Journal

      1. all osd used same ssd partion

      ceph-deploy osd create ceph-node:sdb:/dev/ssd ceph-node:sdc:/dev/ssd

      2.each osd used one ssd partion

      ceph-deploy osd create ceph-node:sdb:/dev/ssd1 ceph-node:sdc:/dev/ssd2

      3.each osd used a file for Journal, this file is on ssd disk

      ceph-deploy osd create ceph-node:sdb:/mnt/ssd/ssd1 ceph-node:sdc:/mnt/ssd/ssd2

      Any suggest?

       Thanks.

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