From: Kumar (ccaqsk@herts.ac.uk)
Date: Sat Apr 24 2004 - 19:13:33 EDT
I obtained a StorEdge L8 Autoloader with LT0 2 tapes to
enable a faster backup and increased capacity per tape.
Loaded Sun Packages SUNWqus & SUNWqusu both 32 and 64 bit
versions.
I installed a dual channel SCSI host adapter X6758A.
Added PatchId 113277-19 112706-03.
I did not make any changes to st.conf as there was a note
with the drive
"Note: No /kernel/drv/st.conf modifications are required for
these operating systems. Modification to /kernel/dev/st.conf
will be unsupported"
boot -r
I was hoping to get 30MB/sec throughput. But ....
I got the following where the rate is in brackets at the
end of each command. The rate was taken from iostat -x
command. The svc_t time was reaching 300 to 400.
ufsdump 0bf 512 /dev/rmt/1cn /mnt (768K/sec)
ufsdump 0bf 512 /dev/rmt/1 /mnt (784K/sec)
tar cEbf 1024 /dev/rmt/1cn /mnt (3800k/sec)
Nowhere near the 30Mb/sec.
I have the latest recommended patches
SunOS xxxxx 5.9 Generic_112233-11 sun4u sparc SUNW,Ultra-4
The platform is a E450 with 4GB of memory and 4 CPU.
/mnt is on a A5200 array mounted under Volume Manager 5 disks
RAID 5. From the md.cf file
d75 -r c3t70d0s6 c3t71d0s6 c3t72d0s6 c3t73d0s6 c3t74d0s6 -k -i 32b
I have tried backing up other volumes from this array
mounted as RAID 0/1 with no significant improvements.
I created a fresh slice and copied large files into it. This slice
is not using Volume Manager and I obtained the following
ufsdump 0bf 512 /dev/rmt/1cn /mnt (819k/sec)
tar cebf 1024 /dev/rmt/1cn /mnt (26316K/sec)
Prior to changing the drive I was backing on to a DLT8000 and was
obtaining order of 8000K/sec using ufsdump.
I would prefer to use ufsdump rather than tar.
During backup the databse has been stopped and there is no other
activity enabled. The slice has over 6000 files of approx
10MB size. A full slice can be 80GB.
I am unable to do a backup because of the increase in the
backup window time
Is this a problem with the A5200 ,Volume Manager or
ufsdump? I have not been
able to find a definitive matrix of transfer rates
using usfdump. Are there any tests I can run to check the
validity of the A5200 and the Volume Manager.
Subodh
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