From: Andreas Dilger <adilger@clusterfs.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Valerie Clement <valerie.clement@bull.net>,
Theodore Tso <tytso@mit.edu>,
ext4 development <linux-ext4@vger.kernel.org>
Subject: Re: [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4 filesystems
Date: Mon, 25 Jun 2007 15:59:23 -0600 [thread overview]
Message-ID: <20070625215922.GM5181@schatzie.adilger.int> (raw)
In-Reply-To: <467FD71A.7030003@linux.vnet.ibm.com>
On Jun 25, 2007 20:24 +0530, Aneesh Kumar K.V wrote:
> Why would one need variable descriptor size. Right now we have only two
> descriptor sizes right (32 and 64 ). Can't we figure out
> the descriptor size we should use by looking at the partition size ? What
> is that i am missing ?.
Because one may want to expand an ext4 filesystem over 16TB after format
time, and this would require a 64-byte descriptor. In ext4 the descriptor
is almost completely full already (to deal with BIG_BG changes, and possibly
large blocksize changes), so we may even need 128-byte descriptors soon.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
prev parent reply other threads:[~2007-06-25 21:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-21 15:04 [RFC][PATCH 1/11][take 2] add new mkfs option to create ext4 filesystems Valerie Clement
2007-06-21 19:08 ` Andreas Dilger
2007-06-25 14:54 ` Aneesh Kumar K.V
2007-06-25 21:59 ` Andreas Dilger [this message]
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