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From: krowitz%richter@UMIX.CC.UMICH.EDU (David Krowitz)
Newsgroups: comp.sys.apollo
Subject: Re:  wbak working, but slow
Message-ID: <9006131334.AA01213@richter.mit.edu>
Date: 13 Jun 90 13:34:55 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
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Apollo's file system / backup facility allows for roughly 150 to 200 MB per
hour to be accessed. We have found that running wbak on a DN3500 with a
690 MB Maxtor drive (the fastest drive Apollo sells) with large (>100 block)
files being dumped to /dev/null (ie. being tossed into the bit bucket so
it wasn't taking up any time waiting for the tape drive) gives us about
200 to 250 MB per hour. The bottle neck appears to be the time needed to
access all the control info (protection, extended ACLS, object type, etc.)
for the file system.


 -- David Krowitz

krowitz@richter.mit.edu   (18.83.0.109)
krowitz%richter.mit.edu@eddie.mit.edu
krowitz%richter.mit.edu@mitvma.bitnet
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