From mboxrd@z Thu Jan 1 00:00:00 1970 From: Farkas Levente Subject: Re: maximum size Date: Tue, 04 Oct 2005 12:16:25 +0200 Message-ID: <43425679.3050601@bppiac.hu> References: <43394753.9040107@bppiac.hu> <17209.18879.583532.761762@cse.unsw.edu.au> <43394E4E.4060702@bppiac.hu> <17210.23249.826375.668486@cse.unsw.edu.au> <17217.49985.339220.524306@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17217.49985.339220.524306@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: Joshua Baker-LePain , linux-raid@vger.kernel.org List-Id: linux-raid.ids Neil Brown wrote: > On Wednesday September 28, jlb17@duke.edu wrote: > >>On Wed, 28 Sep 2005 at 10:56am, Neil Brown wrote >> >> >>>On Tuesday September 27, lfarkas@bppiac.hu wrote: >> >>>>suppose i create the raid device with: >>>>mdadm --create /dev/md0--level=5 --raid-devices=8 --spare-devices=1 >>>>/dev/sd[abcdefgh]1 >>>>then what is the maximum size for /dev/md0? >>>>(or more precisely after a mkfs.ext3 /dev/md0). >>> >>>The /dev/sdX1 cannot be larger than 2TB. The /dev/md0 can be as big >>>as you like. The filesystem can be as big as your filesystem allows. >>>I don't think ext3 can exceed 2 TB (I could be wrong). Other >> >>RH (e.g.) officially supports ext3 FSs up to 8TB in RHEL4. > > > See... I was wrong! :-) > > I'm sure there is a 32bit limit somewhere, so it's probably that block > addresses are limited to 32 bits. With 4K blocks, that's 2^34 K, or > 16TB.... Maybe there is some confusion with the sign bit, making it on > 2^33K, or 8TB. i already find the trivial source kernel/Documentation/filesystems/ext2.txt: --------------------------------- Filesystem block size: 1kB 2kB 4kB 8kB File size limit: 16GB 256GB 2048GB 2048GB Filesystem size limit: 2047GB 8192GB 16384GB 32768GB --------------------------------- -- Levente "Si vis pacem para bellum!"