From: Andreas Dilger <adilger@sun.com>
To: Doug Hunley <doug@hunley.homeip.net>
Cc: linux-ext4@vger.kernel.org
Subject: Re: changing stride and stripe_width post-fs-creation?
Date: Tue, 20 Oct 2009 15:08:51 -0600 [thread overview]
Message-ID: <EA1A7036-FD43-4996-9665-E04FD32A449F@sun.com> (raw)
In-Reply-To: <7284e2210910201032h74cf437bm6043d97748ece4c9@mail.gmail.com>
On 20-Oct-09, at 11:32, Doug Hunley wrote:
> Is it safe to use tune2fs to alter stride and stripe_width on an ext4
> fs once it has been created? Any caveats I should know about? Thanks
The stride is mostly used at fs creation time, but there is no problem
with changing it. The stripe_width is used by the allocator to align
file allocations with the RAID layout.
One question for Eric is whether the new libdisk patches he made will
set
the stripe_width to something ridiculous like 512 or 4096 bytes, or if
it
just leaves that field unset in that case. I suspect it would be bad
for
mballoc to see the stripe_width be such a small value.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2009-10-20 21:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-20 17:32 changing stride and stripe_width post-fs-creation? Doug Hunley
2009-10-20 21:08 ` Andreas Dilger [this message]
2009-10-20 21:16 ` Eric Sandeen
2009-10-20 21:30 ` Andreas Dilger
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