From: Roman Mamedov <roman@rm.pp.ru>
To: Neil Brown <neilb@suse.de>
Cc: Bernd Schubert <bernd.schubert@fastmail.fm>, linux-raid@vger.kernel.org
Subject: Re: RAID6 and crashes (reporting back re. --bitmap)
Date: Mon, 14 Jun 2010 15:14:25 +0600 [thread overview]
Message-ID: <20100614151425.11f91562@natsu> (raw)
In-Reply-To: <20100614090520.2ae5a961@notabene.brown>
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On Mon, 14 Jun 2010 09:05:20 +1000
Neil Brown <neilb@suse.de> 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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next prev parent reply other threads:[~2010-06-14 9:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-10 18:02 RAID6 and crashes Miles Fidelman
2010-06-10 18:57 ` Roman Mamedov
2010-06-10 21:22 ` RAID6 and crashes (reporting back re. --bitmap) Miles Fidelman
2010-06-10 21:41 ` Roman Mamedov
2010-06-10 22:40 ` Miles Fidelman
2010-06-11 2:51 ` Roman Mamedov
2010-06-11 4:31 ` Graham Mitchell
2010-06-11 4:41 ` Roman Mamedov
2010-06-11 12:13 ` Graham Mitchell
2010-06-11 4:42 ` Miles Fidelman
2010-06-11 4:50 ` Neil Brown
2010-06-13 14:28 ` Bernd Schubert
2010-06-13 23:05 ` Neil Brown
2010-06-14 9:01 ` Bernd Schubert
2010-06-14 9:14 ` Roman Mamedov [this message]
2010-06-14 9:47 ` Neil Brown
2010-06-14 11:53 ` Roman Mamedov
2010-06-14 21:24 ` Neil Brown
2010-06-11 4:46 ` Miles Fidelman
2010-06-11 4:55 ` Roman Mamedov
2010-06-11 20:26 ` Miles Fidelman
2010-06-11 5:08 ` Neil Brown
2010-06-11 11:10 ` John Hendrikx
2010-06-11 11:50 ` Roman Mamedov
2010-06-11 12:29 ` Graham Mitchell
2010-06-11 12:25 ` Graham Mitchell
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