Hi Douglas and Mark,
Thanks for your input.
I have created the files SIZE_DATA_BUFFERS and NUMBER_DATA_BUFFERS with
value of 64512 and 16 respectively, the throughtput has a significant
improvement at about
19 MB /sec .
I have tried the following combinations but it seems the above values pair
is the best:
SIZE_DATA_BUFFERS 32768 64512 64512 64512 131072 131072 262144
262144
NUMBER_DATA_BUFFERS 16 8 16 24 4 8 2
4
NET_BUFFER_SZ 32768 64512 64512 64512 131072 131072 262141 262141
THROUGHPUT (KB/sec) 9662 9721 18758 failed 9887 failed 9580
failed
I am still looking for an optimum value pairs.
For those failed cases, I got the following errors:
11:27:13.070 [19805] <16> io_init: system call failed - Invalid argument (at
tmcommon.c.1976)
11:27:13.082 [19805] <16> io_init: could not allocate enough shared memory
for backup buffers
How I can adjust the system shared memory in this case?
Regards,
Chadwick
>From: Douglas Ritschel <dritschel62 AT yahoo DOT com>
>To: mark <mark AT steelfamily DOT org>, Chadwick Leung <poleetea AT hotmail
>DOT com>,
>veritas-bu AT mailman.eng.auburn DOT edu
>Subject: RE: [Veritas-bu] LTO2 backup speed just up to 5 MB/sec under
>Netbackup 4.5
>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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> >
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> >
> >
> >
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> >
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