Date: Wed, 28 Jan 2009 14:23:50 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Jaime <jaime@snowmoon.com> Cc: freebsd-questions@freebsd.org Subject: Re: Quantum tape drive Message-ID: <20090128202349.GD63837@dan.emsphone.com> In-Reply-To: <ae4324ed0901281136v80fd634t1cbed1f73170c2ef@mail.gmail.com> References: <ae4324ed0901281136v80fd634t1cbed1f73170c2ef@mail.gmail.com>
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In the last episode (Jan 28), Jaime said: > I am trying to replace an older DLT tape drive (which doesn't like to > eject tapes any more) with a new Quantum DLT-4 drive. Its connected > by internal SCSI and seems to be set up right. But after DAYS of > running a tar command, its still not done backing up 60GB. The old > drive could backup 70-80GB in about 7 hours. > > Any suggestions? > > /usr/bin/tar -cvpX /usr/local/etc/backups/skiplist-relative.txt -f /dev/sa0 -C / . If nothing else, I suggest bumping up your blocksize. The default for tar (10k) is pretty small for modern tape drives. Try -b 128 (for a 64k block size). Another optimization would be to put a buffering program in between tar and your tape drive to decouple disk reads from tape writes. misc/team, misc/buffer, and misc/cstream in ports are good for this. -- Dan Nelson dnelson@allantgroup.com
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