From: przemolicc@poczta.fm
Date: Tue Aug 08 2006 - 09:10:35 EDT
Hello,
we are doing backups of our v880 (Solaris 9) + array 3310 on LTO3 connected to LVD Ultra3 SCSI card.
The SCSI card is put into 66MHz slot. What is strange is the transfer to the streamer:
/usr/sbin/ufsdump 0uf /dev/rmt/1cn /dev/dsk/c3t0d0s0
...
DUMP: 91.76% done, finished in 0:35
DUMP: 93.98% done, finished in 0:25
DUMP: 95.45% done, finished in 0:19
DUMP: 97.09% done, finished in 0:12
DUMP: 99.41% done, finished in 0:02
DUMP: 1122170430 blocks (547934.78MB) on 1 volume at 21636 KB/sec
Maximal, theoretical transfer rate is:
uncompressed 80 MB/sec
compressed 160 MB/sec
I don't expect we get the theoretical transfers but close to that. Our 20 MB/s
is far from that. We have installed the latest patch for 'qus' and 'st/sd' drivers.
Can you advice me what can we do to speed it up ?
Regards
przemol
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