Date: Mon, 20 Mar 1995 04:13:50 +0200 From: Heikki Suonsivu <hsu@cs.hut.fi> To: guido@IAEhv.nl (Guido van Rooij) Cc: freebsd-hackers@freefall.cdrom.com Subject: restore times veryyyy long Message-ID: <199503200213.EAA03300@shadows.cs.hut.fi> In-Reply-To: guido@IAEhv.nl's message of 19 Mar 1995 20:12:52 %2B0200
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We did a restore of a 1.2 gig partition. The restore was done from
a dat tape to a completely empty partition. It took 10(!) hours.
Can anybody explain why this should take so long?
What drive you have? We have got a WangDAT 3400DX and see similar problem,
about 12KB/s read performance, while writes work normally. The same drive
on a Sun SS10 works considerably better even though it is slower reading
than writing. Both Buslogic 445S and Adaptek 1542 behave similarly.
Restores have been so infrequent that I haven't had time to look at this
more closely, but it might be useful to get it solved.
We also saw cache getting disabled on a HP drive, apparently by changing
from read to write or vice versa, don't remember any more which way it was.
I understood that this was a bug in the drive.
--
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@cs.hut.fi home +358-0-8031121 work -4513377 fax -4555276 riippu SN
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