topic Clean flash cache contents in AFF

Clean flash cache contents

irakli_natsvlishvili — Thu, 05 Jun 2025 06:44:15 GMT

How to clean (dump, remove) flash cache contents? Seems flash cache was enabled during testing phase and filled with a lot of useless data. I want to dump the content and start caching real production data.

Clean flash cache contents

jeredarassier — Thu, 06 Oct 2011 18:23:57 GMT

The content on the card ages itself out and gets replaced by the new content automatically like any other cache you can see the speed it inserting new and deleting old content with the "stats show -p flexscale-access" there are metrics about invalidates and evictions per second as well as information on your hit and miss ratio

If you wanted to force it you could ether disable the cards or probably the safer option would be to do a takeove and giveback of each head. The Cache flushes and has to re-warm after a takeover and giveback.

Clean flash cache contents

irakli_natsvlishvili — Thu, 06 Oct 2011 18:31:17 GMT

If by 'disabling card' means running options flexscale.enable off and options flexcache.enable off commands, it does not work, already tried:

stats show -p flexscale-access

Cache Reads Writes Disk Reads

Usage Hit Meta Miss Hit Evict Inval Insert Chain Blocks Chain Blocks Replaced

% /s /s /s % /s /s /s /s /s /s /s /s

98 0 0 0 0 0 0 0 0 0 0 0 0

Clean flash cache contents

irakli_natsvlishvili — Mon, 10 Oct 2011 23:41:16 GMT

UP, anybody?

4 days have passed since I disabled flash cache, if cache contents age and are cleaned up automatically it should be already cleaned up but it is not the case. Here is the output from the both filers:

stats show -p flexscale-access

Cache Reads Writes Disk Reads

Usage Hit Meta Miss Hit Evict Inval Insert Chain Blocks Chain Blocks Replaced

% /s /s /s % /s /s /s /s /s /s /s /s

82 0 0 0 0 0 0 0 0 0 0 0 0

82 0 0 0 0 0 6 0 0 0 0 0 0

82 0 0 0 0 0 0 0 0 0 0 0 0

stats show -p flexscale-access

Cache Reads Writes Disk Reads

Usage Hit Meta Miss Hit Evict Inval Insert Chain Blocks Chain Blocks Replaced

% /s /s /s % /s /s /s /s /s /s /s /s

98 0 0 0 0 0 0 0 0 0 0 0 0

98 0 0 0 0 0 0 0 0 0 0 0

Clean flash cache contents

pascalduk — Tue, 11 Oct 2011 06:10:33 GMT

I doubt cache usage will go to 0% by just disabling the flash cache. What happens with the usage when you turn it on again?

Anyway, as Jered already mentioned old/stale data will be automatically removed from cache when there is new data that needs to be cached.