From: Dave Kleikamp <shaggy@austin.ibm.com>
To: Brad Boyer <flar@pants.nu>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: 64-bit block sizes on 32-bit systems
Date: Wed, 28 Mar 2001 08:53:03 -0600 [thread overview]
Message-ID: <3AC1FACF.9DEDA627@austin.ibm.com> (raw)
In-Reply-To: 20010328080908.9905E2B54A@marcus.pants.nu
My turn to chime in.
JFS was designed around a 4K meta-data page size. It would require some
major re-design to use larger block sizes. On the other hand, JFS could
take advantage of 64-bit block addresses immediately. JFS internally
store the block address in 40 bits. (Sorry, file size & volume size are
both limited to 4 peta-bytes on JFS.)
At the rate that storage hardware and requirements are increasing,
increasing the block size is a short-term solution that is only going to
delay the inevitable requirement for 64-bit block addressability. There
is a practical limit to a usable block-size. Someone threw out 64K,
which seems reasonable to me.
--
David Kleikamp
IBM Linux Technology Center
next prev parent reply other threads:[~2001-03-28 14:57 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-27 22:23 64-bit block sizes on 32-bit systems Jesse Pollard
2001-03-27 23:56 ` Steve Lord
2001-03-28 8:09 ` Brad Boyer
2001-03-28 14:53 ` Dave Kleikamp [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-03-27 19:57 Jesse Pollard
2001-03-27 20:20 ` Jan Harkes
2001-03-27 21:55 ` LA Walsh
2001-03-27 19:30 Jesse Pollard
[not found] <Pine.LNX.4.30.0103270022500.21075-100000@age.cs.columbia.edu>
[not found] ` <3AC0CA9C.3D804361@sgi.com>
2001-03-27 19:00 ` Jan Harkes
2001-03-27 17:22 LA Walsh
2001-03-26 21:27 Jesse Pollard
2001-03-26 22:07 ` Jonathan Morton
2001-03-27 4:14 ` Jesse Pollard
2001-03-26 19:26 Jesse Pollard
2001-03-26 18:01 Manfred Spraul
2001-03-26 18:07 ` Matthew Wilcox
2001-03-26 19:40 ` LA Walsh
2001-03-26 21:53 ` Manfred Spraul
2001-03-26 22:07 ` LA Walsh
2001-03-26 17:35 LA Walsh
2001-03-26 16:39 LA Walsh
2001-03-26 17:18 ` Matthew Wilcox
2001-03-26 17:47 ` Andreas Dilger
2001-03-26 18:09 ` Matthew Wilcox
2001-03-26 18:37 ` Eric W. Biederman
2001-03-26 19:36 ` Martin Dalecki
2001-03-26 23:03 ` AJ Lewis
2001-03-26 19:05 ` Scott Laird
2001-03-26 19:09 ` Andreas Dilger
2001-03-26 20:31 ` Dan Hollis
2001-03-26 19:20 ` Rik van Riel
2001-03-26 20:14 ` Jes Sorensen
2001-03-26 17:58 ` Eric W. Biederman
2001-03-28 8:06 ` Matthew Wilcox
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