Il 2024-01-17 12:08 Zdenek Kabelac ha scritto:
It's also not completely
true that even 'writethrough' cache cannot have dirty-blocks (aka -
only present in cache and origin had failed writes).
Hi, really? From dm-cache docs:
"If writethrough is selected then a write to a cached block will not
complete until it has hit both the origin and cache devices. Clean
blocks should remain clean."
So I would not expect to see dirty blocks on write-through cache, unless
the origin device is unable to write at all - which means that removing
the cache device would be no worse that not having it at all in the
first place.
What am I missing?
But ATM we are not seeing it as some major trouble. Hotspot cache is
simply not supposed to be randomly removed from your systems - as it
it's not easy to rebuild.
As a write-through cache should not contain dirty data, using a single
SSD for caching should be OK. I think that if such expendable (and
write-through) SSD fails, one should be able to boot without issues.
Thanks.
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Danti Gionatan
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