Date: Tue, 08 Jul 2008 14:13:44 -0700 From: Bakul Shah <bakul@bitblocks.com> To: Julian Elischer <julian@elischer.org> Cc: freebsd-fs@freebsd.org, juri_mian@yahoo.com Subject: Re: 24 TB UFS2 reality check ? Message-ID: <20080708211344.39FC75B46@mail.bitblocks.com> In-Reply-To: Your message of "Tue, 08 Jul 2008 13:01:50 PDT." <4873C7AE.50809@elischer.org>
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On Tue, 08 Jul 2008 13:01:50 PDT Julian Elischer <julian@elischer.org> wrote: > Juri Mianovich wrote: > > I am about to attach 24 1 TB drives to a 3ware 9650SE-24 raid card > and attach it to a FreeBSD 6.3-RELEASE system. > > > I am going to newfs that raw disk and turn it into one giant 24 TB > UFS2 filesystem: I think Jan is asking for trouble.... At the very least he should consider mirroring or RAID5ing. > You had better have a lot of memory available ot your processes to be > able to fsck this baby.. (it'd better be an amd64).. > I don't remember the exact numbers but for 16k blocksize, > it was something like 200MB ram for each 100GB of filesystem when > populated with 60KB files.. > (don't trust those numbers, do some testing (and let us know :-) ) I vaguely recall it was more like 700MB of memory per Terabyte on a 50% filled UFS2. Things may have improved in the three years since I did that. I don't recall the time to fsck but it was pretty bad! That was the main reason I switched from UFS2.
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