From: Marc MERLIN <marc@merlins.org>
To: linux-raid@vger.kernel.org
Subject: Can reading a raid drive trigger all the other drives in that set?
Date: Tue, 28 Jun 2011 09:22:05 -0700 [thread overview]
Message-ID: <20110628162205.GG20420@merlins.org> (raw)
I have ext4 over lvm2 on a sw raid5 with 2.6.39.1
In order to save power I have my drives spin down.
When I access my filesystem mount point, I get hangs of 30sec or a bit more
as each and every drive are woken up serially.
Is there any chance to put a patch in the block layer so that when it gets a
read on a block after a certain timeout, it just does one dummy read on all
the other droves in parallel so that all the drives have a chance to spin
back up at the same time and not serially?
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/
next prev reply other threads:[~2011-06-28 16:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-31 2:20 Decoding marvel + Sil PMP errors / NCQ disabled due to excessive errors / 1.5G downgrade Marc MERLIN
2011-06-28 16:22 ` Marc MERLIN [this message]
2011-09-02 1:23 ` Can reading a raid drive trigger all the other drives in that set? Marc MERLIN
2011-09-02 21:28 ` Doug Dumitru
2011-09-03 5:13 ` Marc MERLIN
2011-09-24 22:33 ` Marc MERLIN
2011-09-02 23:09 ` Decoding marvel + Sil PMP errors / NCQ disabled due to excessive errors / 1.5G downgrade Mark Lord
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