[Veritas-bu] LTO2 backup speed just up to 5 MB/sec under Netbackup 4.5
2004-03-14 10:03:50
Subject: |
[Veritas-bu] LTO2 backup speed just up to 5 MB/sec under Netbackup 4.5 |
From: |
dritschel62 AT yahoo DOT com (Douglas Ritschel) |
Date: |
Sun, 14 Mar 2004 07:03:50 -0800 (PST) |
You can increase the blocksize that netBackup uses, by
creating a file:
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS. The
file should contain one line with powers of 2 times
1024.
For example, 256 times 1024:
262144
You can also increase the number of data buffers by
creating a file:
/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
It should contain one line which is a multiple of 2,
the max is 256.
Also can increase the fragment size of the storage
unit to 2000.
--- mark <mark AT steelfamily DOT org> wrote:
> On 4.5 the limitation of a backup from local disk to
> a tape is bpbkar which
> has a block size of 32kb internally. this is fixed
> and cannot be tuned,
> whereas tar or cpio you can set a much larger
> blocksize.
>
> in netbackup 5.0 this blocksize is 128k, but still
> not tuneable. best thing
> is to get multiple bpbkar processes running in
> parallel by breaking the
> filelist into streams of drives / mounts or files -
>
> ie rather than backing up
>
>
> /usr
>
> run
>
> /usr/*
>
> or
>
> /usr/[a-m]* ( i think you can do this on unix
> clients, but not windows )
> /usr/[n-z]*
>
> and you will get a different backup stream for each
> directory. This isn't a
> good example on /usr - you have to make sure the
> spec you pick doesnt
> generate too many streams which are very small, and
> also make sure the
> wildcard spec has no 'gaps' otherwise some point
> down the line you might
> find you haven't been backing everything up.
>
> regards
> mark
>
>
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On
> Behalf Of Chadwick
> Leung
> Sent: 14 March 2004 06:23
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] LTO2 backup speed just up to 5
> MB/sec under
> Netbackup 4.5
>
>
> Greeting!
>
> I have installed a Sun L8 autoloader which replaces
> a Sun L9 model . The L8
> has been successfully installed and can operate
> without problem. However,
> the average throughput is just up to 5 MB/sec under
> Netbackup 4.5.
>
> I tried to TAR a 1.2 GB file direct to the LTO2
> tape, it took about a
> minute. Under Netbackup, backing up the same file
> take about 4 mins. 30 sec.
>
> Any idea?
>
> Best Regards,
> Chadwick Leung
>
>
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