Bob, Paul, murtuja
Some clarification. Backup of local server means
Netbackup Master/Media server itself not any other
system from the network.
I am trying to backup OS Disk. NO raid configuration.
# df -kFufs
Filesystem kbytes used avail capacity
Mounted on
/dev/dsk/c1t0d0s0 8263373 180817 7999923 3%
/
/dev/dsk/c1t0d0s5 19623529 1458826 17968468 8%
/usr
/dev/dsk/c1t0d0s3 10327372 7534947 2689152 74%
/var
/dev/dsk/c1t0d0s4 15493995 30262 15308794 1%
/opt
/dev/dsk/c1t1d0s0 41311843 5549567 35349158 14%
/usr/openv
Following error message i am getting in bptm logs
11:54:09.851 [927] <2> write_data: waited for full
buffer 7898 times, delayed 11254 times
May be this is the bottleneck. So i tried to configure
different buffer size but still messages.
I checked the Disk I/O by using
/usr/openv/netbackup/bin/bpbkar -nocont -dt 0
-nofileinfo -nokeepalives filesystem > /dev/null
Here I am getting Disk speed more that 170Mbps
Yes Bob its in magabytes/second
Thanks & regards,
Vijay
--- bob944 <bob944 at attglobal.net> wrote:
> First, congratulations on supplying a lot of useful
> info in the first
> posting.
>
> > We are using Netbackup 5.1MP6 on Solaris 9.
> > H/W Detasils :
> > Master/Media Server : v440, 4CPU, 16Gb RAM
> > Tape Library : L500, 4 F-CAL Drive (LTO Gen 2)
> > Network Speed : 1GBPS
> > Tape library is directly connected to server.
> >
> > Currently when trying to take backup of local
> server i
> > am getting 22Mbps throughput which i feel is very
> > less.
>
> Not to quibble, but I'm sure you are saying 22
> megabytes, not megabits,
> right? (I know someone who sized his tape HBA
> requirements thinking the
> specs were MB/s, when they were, of course, Mb/s--so
> it's worth being
> rigorous on the notation.)
>
> > Current Buffer settings:
> > NET_BUFFER_SZ : 262144
> > NUMBER_DATA_BUFFERS :128
> > SIZE_DATA_BUFFERS : 262144
> >
> > /etc/system:
> > *Added for Nebackup
> > set msgsys:msginfo_msgmap=512
> > [...]
> >
> > So i would like to know practically what is the
> > maximum throughput i can get & buffer setting.
> What
> > all changes i need to do on server to get maximum
> > throughput
>
> LTO2 drives aren't all that fast--half-height LTO2s
> are
> manufacturer-rated at something like 24-28MB/s
> native and the best
> rating I know of is 35MB/s. See point #2 below.
>
> You want three things:
> 1. NetBackup 6.0 Performance Tuning Guide
> 2. Follow the guide to determine where the
> bottlenecks are--there's no
> point in tuning NetBackup buffers if, say, the
> client can't supply data
> fast enough.
> 3. When you can demonstrate to yourself that
> NetBackup is the slow link
> in the chain, then it is worth a controlled,
> rigorous buffer tuning
> exercise.
>
> 128 256KB buffers is way more than enough to drive
> an LTO2.
>
>
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