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From: wescott@sauron.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Problems Backing Up Large Filesystems to Tape
Message-ID: <842@sauron.Columbia.NCR.COM>
Date: Wed, 25-Mar-87 14:50:33 EST
Article-I.D.: sauron.842
Posted: Wed Mar 25 14:50:33 1987
Date-Received: Fri, 27-Mar-87 05:27:59 EST
References: <5440@brl-adm.ARPA> <262@herman.UUCP>
Reply-To: wescott@sauron.UUCP (Mike Wescott)
Organization: Advanced Systems Development, NCR Corp., Columbia, SC
Lines: 20

In article <262@herman.UUCP> det@herman.UUCP (Derek Terveer) writes:
> In article <5440@brl-adm.ARPA>, chrisb@ALMSA-1.arpa (Christine Blumenkamp) writes:
>> The volcopy command does prompt for additional tapes; however, we have
>> problems restoring files with this command since we do not have an additional
>> disk which is large enough for restoring our large filesystems.

> I have never used this particular command (frec), but it appears in  the  admin
> manual  and  it  looks  like it could be right up your alley. 

I have used it.  With vanilla SystemV whatever version there is a problem:
frec will not recover files that are big enough to require triple indirect
blocks.  On the otherhand, it is as smart as it can be about reading the tape.
It stops when it has found all the blocks of the file.  It can, however, take
three or four (I'm not sure of the max) scans of the entire set before finding
all the blocks of a file, since indirect blocks found may point to data blocks
already read (and ignored).

-- 
	-Mike Wescott
	 wescott@ncrcae.Columbia.NCR.COM