Re: Bluestore Compression

[Igor Fedotov <ifedotov@xxxxxxx>]

Hi Ashley,

general rule is that compression switch do not affect existing data but controls future write request processing.

You can enable/disable compression at any time.

Once disabled - no more compression is happening. And data that has been compressed remains in this state until removal or overwrite or (under some circumstances when keeping it compressed isn't beneficial any more)  garbage collection. The latter is mostly triggered by some partial overwrite.

Thanks,

Igor

On 5/2/2019 12:20 PM, Ashley Merrick wrote:

Hello,

I am aware that when enabling compression in bluestore it will only compress new data.

However, if I had compression enabled for a period of time, is it then possible to disable compression and any data that was compressed continue to be uncompressed on read as normal but any new data not be compressed.

Or once it's enabled for a pool there is no going back apart from creating a new fresh pool?

, Ashley

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