Hi,
We have a strange performance issue with staging from Disk to Tape.
Config:
Sun V440 as Master/Media Server
Storagetek FlexLine640 used as Staging Device
Storagetek L700 w. LTO3
SIZE_DATA_BUFFERS 2048k
NUMBER_DATA_BUFFERS 16
SIZE_DATA_BUFFERS_DISK 2048k
NUMBER_DATA_BUFFERS_DISK 16
When we use the Flex640 as a "normal" Storage and doing Backups from
Disk to the L700 Storage,
we see ~140MB/sec. throughput to one LTO3 (higher than expected).
When we use the same Volume on the Flex640 as an Disk Staging Unit an do
manual relocate to 1 LTO3
we only see ~70MB/sec.
When we are using two staging units on the flex and are staging to 2
LTO3 we see ~50MB/sec. per drive.
An overall of 100MB/sec.
Since Staging is done via bpduplicate, are there any settings that are
staging, or bpduplicate specific?
It looks like that there is an "internal" limit, because tape, disk and
system have spare resources left (enough idle time)
do you have an ideas?
thx
Jochen
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Jochen Pressler
Bacher Systems EDV GmbH
Clemens-Holzmeister-Strasse 4 , A-1100 Wien, Business Park Vienna,
phone: +43 (1) 60 126-34 | fax: +43 (1) 60 126-4
jo AT bacher DOT at | http://www.bacher.at
Sun Certified Professional
Veritas Certified Professional
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