[Veritas-bu] slow backup on LTO2 drives
2003-09-11 12:20:59
Have you considered tuning the buffers in NetBackup?
With your dd test, what block size did you use?
David
-----Original Message-----
From: Fabien.LIOU AT fr.thalesgroup DOT com
[mailto:Fabien.LIOU AT fr.thalesgroup DOT com]
Sent: Thursday, September 11, 2003 9:23 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] slow backup on LTO2 drives
Hello,
I've a STK L700 library with 4 LTO2 drives.
My master NBU server is under Solaris8 (with latest kernel patch and
LTO2
patch) with NBU4.5fp5
Interfaces between drives and master are 2gigabit.
Switch is a sphereon 4500
My st.conf file is:
tape-config-list=
"IBM ULTRIUM-TD2", "IBM Ultrium-2",
"CLASS_LTO2",
"IBM ULT3580-TD2", "IBM 3580 Ultrium-2",
"CLASS_LTO2";
CLASS_LTO2 = 1,0x3B,0,0x45863d,2,0x40,0x42,1;
name="st" class="scsi"
target=0 lun=0;
name="st" class="scsi"
target=1 lun=0;
name="st" class="scsi"
target=2 lun=0;
name="st" class="scsi"
target=3 lun=0;
name="st" class="scsi"
target=4 lun=0;
name="st" class="scsi"
target=5 lun=0;
name="st" class="scsi"
target=6 lun=0;
name="st" class="scsi"
target=7 lun=0;
name="st" class="scsi"
target=8 lun=0;
name="st" class="scsi"
target=9 lun=0;
name="st" class="scsi"
target=10 lun=0;
name="st" class="scsi"
target=11 lun=0;
name="st" class="scsi"
target=12 lun=0;
name="st" parent="fp" target=0;
My sg.conf is:
# Configuration file for SCSA Generic.
#
name="sg" class="scsi" target=0 lun=0;
name="sg" class="scsi" target=0 lun=1;
name="sg" class="scsi" target=1 lun=0;
name="sg" class="scsi" target=1 lun=1;
name="sg" class="scsi" target=2 lun=0;
name="sg" class="scsi" target=2 lun=1;
name="sg" class="scsi" target=3 lun=0;
name="sg" class="scsi" target=3 lun=1;
name="sg" class="scsi" target=4 lun=0;
name="sg" class="scsi" target=4 lun=1;
name="sg" class="scsi" target=5 lun=0;
name="sg" class="scsi" target=5 lun=1;
name="sg" class="scsi" target=6 lun=0;
name="sg" class="scsi" target=6 lun=1;
name="sg" class="scsi" target=7 lun=0;
name="sg" class="scsi" target=7 lun=1;
name="sg" class="scsi" target=8 lun=0;
name="sg" class="scsi" target=8 lun=1;
name="sg" class="scsi" target=9 lun=0;
name="sg" class="scsi" target=9 lun=1;
name="sg" class="scsi" target=10 lun=0;
name="sg" class="scsi" target=10 lun=1;
name="sg" class="scsi" target=11 lun=0;
name="sg" class="scsi" target=11 lun=1;
name="sg" class="scsi" target=12 lun=0;
name="sg" class="scsi" target=12 lun=1;
When i do a "dd", performance seems to be ok (30Mo/s).
But when i use NBU, i usually obtain 5Mo/s locally or remotely!!
Does anyone can point me to the misconfiguration ?
Thanks.
Fabien
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