wal and db device on SSD partitions?

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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) ?

2. if ok to do 1., how to size the SSD partition for wal/db ?

3. do we need to tune parameters like bluestore_cache_size_ssd when SSD is used in OSD?

 

Thanks a lot.

Best Regards,

/ST Wong

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