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I'm using ITC.
=20
Second copy is 20 miles across town via FC over DWDM.
=20
both targets are STK L700e loaded with Native FC IBM LTO2 drives,
connected via SanBox2 Sun (QLogic) switches (Soon to be replaced with
Brocade 3800s surplused from another project) and Sun (QLogic) X6768A
HBAs
=20
Can write 30+ MB/s to two tapes simultaneously.....performance hit over
a single drive is negligible.
=20
Are you doing correct benchmarked tests that aren't being affected by
other influences?
i.e., with no other backup or restore jobs running, you're backing up
the same machine (same data set, same network connectivity, etc, etc)
twice, each time to a single drive, to each of the two drives (eliminate
the possibility that one particular drive you're only using in the ITC
config isn't the problem) you will use for the ITC job, then repeating
the exact same job using ITC to the 2 identical tape drives?
=20
Paul
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Fernandes,
Eustace
Sent: December 30, 2005 11:26 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Inline tape copy slow
=09
=09
Inline tape copies are slow, our normal backups get 16 mb/sec,
with inline tape copy the speed is almost 50% slower, 8 mb/sec
Is anyone out there using inline tape copies, what speeds are
you getting, is it 50% slower?=20
Duplication speeds seem to be normal, i.e. 16mb/sec=20
My Tape Library Quantum P3000 is configured in a SAN=20
P3000 SDLT320 -----(Fiber Bridge FC230)---- Brocade ------ JNI
HBA =20
I am trying to find out if this is normal for Inline Tape
Copies, if not then there is some tuning to do=20
Eustace Fernandes=20
Technical Support=20
<mailto:efernandes AT talisman-energy DOT com
<mailto:efernandes AT talisman-energy DOT com> >=20
voice (403) 237-1534=20
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<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>I'm=20
using ITC.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>Second=20
copy is 20 miles across town via FC over DWDM.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>both=20
targets are STK L700e loaded with Native FC IBM LTO2 drives, connected =
via=20
SanBox2 Sun (QLogic) switches (Soon to be replaced with Brocade 3800s =
surplused=20
from another project) and Sun (QLogic) X6768A =
HBAs</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>Can=20
write 30+ MB/s to two tapes simultaneously.....performance hit over =
a=20
single drive is negligible.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>Are=20
you doing correct benchmarked tests that aren't being affected by other=20
influences?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN =
class=3D841402816-30122005>i.e.,=20
with no other backup or restore jobs running, you're backing up the =
same=20
machine (same data set, same network connectivity, etc, etc) twice, each =
time=20
to a single drive, to each of the two drives (eliminate the=20
possibility that one particular drive you're only using in the ITC =
config=20
isn't the problem) you will use for the ITC job, then repeating the =
exact same=20
job using ITC to the 2 identical tape drives?</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#800000 size=3D2><SPAN=20
class=3D841402816-30122005>Paul</SPAN></FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #800000 2px =
solid; MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of=20
</B>Fernandes, Eustace<BR><B>Sent:</B> December 30, 2005 11:26=20
AM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT
edu<BR><B>Subject:</B>=20
[Veritas-bu] Inline tape copy slow<BR><BR></FONT></DIV><!-- Converted =
from text/rtf format -->
<P><FONT face=3DArial size=3D2>Inline tape copies are slow, our normal =
backups get=20
16 mb/sec, with inline tape copy the speed is almost 50% slower, 8=20
mb/sec</FONT></P>
<P><FONT face=3DArial size=3D2>Is anyone out there using inline tape =
copies, what=20
speeds are you getting, is it 50% slower?</FONT> <BR><FONT =
face=3DArial=20
size=3D2>Duplication speeds seem to be normal, i.e. 16mb/sec</FONT> =
</P>
<P><FONT face=3DArial size=3D2>My Tape Library Quantum P3000 is =
configured in a=20
SAN</FONT> <BR><FONT face=3DArial size=3D2>P3000 SDLT320 -----(Fiber =
Bridge=20
FC230)---- Brocade ------ JNI HBA </FONT><BR><FONT face=3DArial =
size=3D2>I=20
am trying to find out if this is normal for Inline Tape Copies, if not =
then=20
there is some tuning to do</FONT> </P>
<P><FONT face=3D"Monotype Corsiva" color=3D#000080 =
size=3D5></FONT> <FONT=20
face=3D"Monotype Corsiva" color=3D#008080 size=3D4>Eustace =
Fernandes</FONT>=20
<BR><B><FONT face=3D"MS Sans Serif" color=3D#0000ff size=3D1>Technical =
Support</FONT></B> <BR><FONT face=3D"MS Sans Serif" color=3D#000080=20
size=3D2> <</FONT><U></U><A=20
href=3D"mailto:efernandes AT talisman-energy DOT com"><U><FONT face=3D"MS =
Sans Serif"=20
color=3D#0000ff=20
=
size=3D2>mailto:efernandes AT talisman-energy DOT
com</FONT></U><U></U></A><U></=
U><FONT=20
face=3D"MS Sans Serif" color=3D#000080 size=3D2>></FONT> =
<BR><B><FONT=20
face=3D"MS Sans Serif" color=3D#000080 size=3D1>voice (403) =
237-1534</FONT></B>=20
</P><BR><BR></BLOCKQUOTE></BODY></HTML>
=00
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