Hi,
On 11/26/21 12:47 PM, Christoph Adomeit wrote:
Hi,
I am just wondering if it is recommended to regularly fstrim or discard ceph bluestore osds on flash memory
(ssds and nvmes) and how it is done and configured ?
fstrim and discard are filesystem level operations, since a filesystem
has to keep track of unused space.
Bluestore OSDs do not use a traditional filesystem, but manage the raw
device on their own. So there's no way to trigger a trimming run AFAIK.
But: there are configuration options to allow the OSD itself to trim
free spaces:
- bdev enable discard
- bdev async discard
I haven't used them yet, so I cannot comment on how well they work, how
much they impact performance etc.
Regards,
Burkhard
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