On Mon, 14 Jun 2010 09:05:20 +1000
Neil Brown <neilb@xxxxxxx> wrote:
> > While I have done this myself a couple of times, I still do not understand
> > where it takes the disk space for the bitmap journal from? Is this space
> > mdadm reserved for this purpose?
>
> Sort-of.
> It uses space that the alignment requirements of the metadata assure us is
> otherwise unused.
> For v0.90, that is limited to 60K. For 1.x it is 3K.
I have now:
md0 : active raid5 sdf3[3] sde3[1] sda3[0]
3887004672 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU]
bitmap: 1/8 pages [4KB], 131072KB chunk
Metadata is 1.2, and the internal bitmap is 8 pages, which is 32K, not 3K.
Did I misunderstand something, or perhaps 3K was a typo?
--
With respect,
Roman
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