Il 13-05-2019 10:26 Zdenek Kabelac ha scritto:
Hi
There is no technical problem to enable caching of cached volume (aka
convert cache_cdata LV into another 'cached' volume.
And as long as there are not errors anywhere - it works.
Difficulty comes with solving error cases - and that's the main reason
it's not enable so far.
So I don't see big issue with enabling usage on 'user's own risk'.
Hi, how "cache of cached volume" is tiered/hierarchical storage?
In such a case, total available space is the sum of all storage
hierarchy. For example, using 1 TB SSD + 8 TB HDD would result in 9 TB
total in a tiered/hierarchical case, while "only" 8 TB on a cached
setup.
Am I missing something here?
The interesting thing is that LVM already supports something similar to
tiered storage, as pvmove can be used to migrate hot physical extent to
faster devices. The hard/manual thing is to determine *which* extent to
move/migrate.
Regards.
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