2018-03-21 7:20 GMT+01:00 ST Wong (ITSC) <ST@xxxxxxxxxxxxxxxx>:
Hi all,
We got some decommissioned servers from other projects for setting up OSDs. They’ve 10 2TB SAS disks with 4 2TB SSD.
We try to test with bluestores and hope to play wal and db devices on SSD. Need advice on some newbie questions:
1. As there are more SAS than SSD, is it possible/recommended to put wal and db of multiple OSDs in partitions on same SSD (instead of using whole SSD device) ?
Yes, that's common practice. Although the general advice is no more then 5 OSD's per wal/db SSD.
2. if ok to do 1., how to size the SSD partition for wal/db ?
~ 10GB per TB. In your case 20GB partitions for 2TB drives.
3. do we need to tune parameters like bluestore_cache_size_ssd when SSD is used in OSD?
Only if your low on RAM.
Caspar
Thanks a lot.
Best Regards,
/ST Wong
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