From: Marc MERLIN <marc@merlins.org>
To: linux-raid@vger.kernel.org
Subject: Re: Intent Bitmap size and performance
Date: Sat, 1 Feb 2014 16:56:46 -0800 [thread overview]
Message-ID: <20140202005646.GC25441@merlins.org> (raw)
In-Reply-To: <20140202003915.GB25441@merlins.org>
On Sat, Feb 01, 2014 at 04:39:15PM -0800, Marc MERLIN wrote:
> How can I tell I got the size for my array size?
Aah, the clue seems to be in the kernel logs:
[669348.274368] md7: bitmap file is out of date (0 < 38029) -- forcing full recovery
[669348.299174] created bitmap (15 pages) for device md7
[669348.316720] md7: bitmap file is out of date, doing full recovery
[669348.380555] md7: bitmap initialized from disk: read 1 pages, set 29809 of 29809 bits
If I got the math right, 30K bits for 8TB is one bit per 266MB.
Given that, I'm going to assume that this is not going to impact system
performance much for most operations.
Is my assumption and conclusion correct?
Thanks,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
next prev parent reply other threads:[~2014-02-02 0:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-02 0:39 Intent Bitmap size and performance Marc MERLIN
2014-02-02 0:56 ` Marc MERLIN [this message]
2014-02-02 6:28 ` NeilBrown
2014-02-06 19:05 ` Marc MERLIN
2014-02-06 21:21 ` NeilBrown
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