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List:       bacula-users
Subject:    Re: [Bacula-users] Multiplexing multiple jobs to tape
From:       "John Drescher" <drescherjm () gmail ! com>
Date:       2007-08-31 12:33:07
Message-ID: 387ee2020708310533v70a7f738l5bb741502269d69e () mail ! gmail ! com
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> If it does support multiplexing, what kind of options do I need in the
> config files? I currently have bacula talking to the drive, but I was
> getting 25MB/sec backing up a 10gig file of zeros (admittedly from a
> single SATA disk so that's not too surprising), but just 10MB/sec doing
> a trial backup of a home directory server over the network, from a
> pretty fast RAID. We get better performance from our current LTO-2
> drives and Legato Networker :(
>
You are on a gigabit network? And the bacula-sd device (machine
connected to the tape drive) is a fast machine with 2 or more
processors and at least 2GB of memory? And you are using postgresql or
mysql for your database? And you had software compression off?


Also I would test the raw drive speed of your tape drive / controller setup.

Put a blank tape in the drive and use dd to dump bytes to the device.
When I first tested my LTO2 archive I did something like

dd if=/dev/sda of=/dev/nst0 bs=1M

and I got around 35MB/s.

In bacula on the fastest Full jobs I get 25 to 30MB/s over the gigabit network.

To achive 120MB/s you will have to do that from a raid(0,5,6).

John

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