From: Karel Zak <kzak@redhat.com>
To: John Lindgren <john.lindgren@tds.net>
Cc: util-linux@vger.kernel.org, Andreas Dilger <adilger@sun.com>
Subject: Re: blkid: excessive random reads probing for ZFS on NTFS filesystem
Date: Mon, 20 Jun 2011 13:16:40 +0200 [thread overview]
Message-ID: <20110620111640.GE17967@nb.net.home> (raw)
In-Reply-To: <4DF50D58.9020800@tds.net>
On Sun, Jun 12, 2011 at 03:02:48PM -0400, John Lindgren wrote:
> I noticed blkid causing a noticeable amount of disk hits while
> identifying an NTFS (Win7) partition, and did an strace to find out why
> this was. It seems that the probe_zfs() function does a
> seek-and-read-41-bytes pattern 64 times in the 130 to 520 KB region of
> the partition.
Is it really so big problem on traditional HDDs?
> This of course is slow on a traditional hard disk, and
> seems excessive. I don't know the internals of NTFS or of ZFS. Can
> someone with a little more knowledge in this area provide some pointers
> as to why this might be happening?
CC: Andreas who is the code (co)author.
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
next prev parent reply other threads:[~2011-06-20 11:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-12 19:02 blkid: excessive random reads probing for ZFS on NTFS filesystem John Lindgren
2011-06-20 11:16 ` Karel Zak [this message]
2011-06-20 11:59 ` John Lindgren
2011-06-20 12:46 ` Karel Zak
2011-06-20 13:05 ` John Lindgren
2011-06-20 14:04 ` Karel Zak
2011-06-20 14:20 ` John Lindgren
2011-06-20 14:57 ` Karel Zak
2011-06-20 12:02 ` John Lindgren
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