Subject: Re: [netatalk-admins] Large Volume Support? again
From: Stefan Bethke (stefan@promo.de)
Date: Tue Feb 03 1998 - 12:40:22 EST
--On Die, 3. Feb 1998 0:16 Uhr -0800 "Walt Bigelow" <walt@stimpy.com> wrote:
> Andrew McNabb wrote:
> slackware 96/netatalk 1.4b2 with the mac os 8 fix). It reports 2gig
> where I actually have a 32GB raid array available on the file server. I
> have looked through the dist for a compile time option, but have found
> none. What is the trick to make it repor the ACTUAL size?
You have to understand the various parts involved: the AFP server
(protocol), the AppleShare client, the External File System interface and
the Finder.
As of MacOS 8.0 the External File System interface does exchange volume
information as an unsigned 32bit number (4 GB). This was upped from a signed
32bit in 7.6 (2 GB). This hasn't changed in 8.1, as I believe.
netatalk 1.4b2 (with or without macos8 patch) only does AFP 2.1, which also
limits the number to 32 bits (4 GB). Currently, netatalk only uses 31 bits.
AFP 2.2 introduced new calls that use 64 bits (about 17,000,000 TB).
AppleShare client 3.7.0 was the first to support AFP 2.2 (including
afp-over-tcp aka AppleShare IP), but didn't take advantage of those 64 bit
calls. 3.7.2 and above take advantage of the calls.
The Finder (even in 8.1 I think) normally is limited to 4 GB.
However, AppleShare Client 3.7.2 and above tweak the numbers so the Finder
actually can display sizes of over 4 GB. (I'm not sure what the upper limit
is.)
Note that this has *nothing* to do with the ability of 7.6 and above to use
*local* HFS/HFS+ volumes larger than 2 or 4 GB.
So, what gives? If you want to see accurate volume information for volumes
larger than 2 GB, use Adrian Sun's patches for AFP 2.2 support and
AppleShare 3.7.2 or newer.
Stefan
-- Stefan Bethke Promo Datentechnik | Tel. +49-40-851744-18 + Systemberatung GmbH | Fax. +49-40-851744-44 Eduardstrasse 46-48 | e-mail: stefan@Promo.DE D-20257 Hamburg | http://www.Promo.DE/
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