Re: [SUMMARY] ufsdump & tape capacity
From: Thomas Schulz (schulz_at_adi.com)
Date: 10/22/04
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Date: Fri, 22 Oct 2004 19:44:15 +0000 (UTC)
In article <clbkj1$fr5$02$1@news.t-online.com>,
Julian Thomas <julian.thomas@t-online.de> wrote:
>Thank you all for the replies!!!
>
>A short summary:
>
>a) same result if i use /dev/rmt/0u, 0, 0c, 0h
>
>b) over night i will try a different blocksize:
> ufsdump 0bf 96 /dev/rmt/0 /dev/md/rdsk/d2 or
> ufsdump 0bf 126 /dev/rmt/0 /dev/md/rdsk/d2
>
> And what about the restore? Can i just restore
> a dump with a blocksize of 126 the same way or is
> there anything special? I want to restore
> a dump with ufsrestore by hand, if a disk fails.
The Solaris ufsrestore will figure out the block size on it's own. If you
ever have to deal with other systems, some of them need to have the block
size specified on the restore command line. It is always a good idea to
do a test restore every so often to make sure that everything is working.
>c) I've an external tape drive, i didn't change
>anything on the drive directly (ie. the jumpers).
>I just attached the device and follwed the instructions
>in the installation manual to get the drive work.
>I also didn't find any information about a jumper for
>the hardware compression.
On would hope that if you got the drive from Sun, everything would be set
correctly at the factory. Some drives have a jumper or switch to disable
compression, but I doubt that Sun would ship it with compression disabled.
/dev/rmt/0c is the device for compression, but if your data can not be
compressed, you would see little difference. I would expect some difference,
but possibly a very small difference.
>Julian
>
-- Tom Schulz schulz@adi.com
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