David Greaves wrote:
How do I interpret:
bitmap: 0/117 pages [0KB], 1024KB chunk
in the mdstat output
what does it mean when it's, eg: 23/117
This refers to the in-memory bitmap (basically a cache of what's in the
on-disk bitmap -- it allows bitmap operations to be more efficient).
If it's 23/117 that means there are 23 of 117 pages allocated in the
in-memory bitmap. The pages are allocated on demand, and get freed when
they're empty (all zeroes). The in-memory bitmap uses 16 bits for each
bitmap chunk to count all ongoing writes to the chunk, so it's actually
up to 16 times larger than the on-disk bitmap.
--
Paul
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