Date: Sun, 25 Feb 2001 15:37:40 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Bernd Walter <ticso@cicely8.cicely.de> Cc: David Gilbert <dgilbert@velocet.ca>, Bernd Walter <ticso@cicely5.cicely.de>, freebsd-hackers@FreeBSD.ORG Subject: Re: [hackers] Re: Large MFS on NFS-swap? Message-ID: <200102252337.f1PNbeS18875@earth.backplane.com> References: <15000.8884.6165.759008@trooper.velocet.net> <20010225042933.A508@cicely5.cicely.de> <200102250644.f1P6iuL12016@earth.backplane.com> <15001.21129.307283.198917@trooper.velocet.net> <200102251913.f1PJDAc15495@earth.backplane.com> <15001.35517.468307.915125@trooper.velocet.net> <20010226001436.A728@cicely8.cicely.de>
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:With 512 Byte blocksizes you are limited to 1T because the physical
:block number is a signed 32bit.
:FFS uses 32bit (I wouldn't count on the high bit) frag numbers.
:A fragment defaults to 1k so even with 1k fragments the limit is
:at least 2T.
Yes, the FFS limit is essentially the frag size limitation. However,
internally our device I/O path normalizes blocks to 512 byte quantities.
I've heard of people running larger filesystems (16TB) with larger
fragment sizes, but I'm not exactly sure how it can work under
FreeBSD due to the normalization that the FreeBSD device layer makes.
-Matt
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