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A note of advice for those using SDLT320 drives - check your st.conf =
settings . =20
=20
I recently upgraded my tape environment from DLT8000 to SDLT320 drives. =
I was given the following settings, by Veritas support and assured =
repeatedly that these were the proper settings for SDLT320 drives.
=20
SDLT-data =3D 1,0x38,0,0x19639,4,0x90,0x91,0x90,0x91,3;
=20
We did some data integrity testing and all looked good. The initial =
performance looked OK, not stellar but OK. I assumed the lackluster =
performance indicated buffer tuning was required.
=20
3 weeks in, I did some initial review of tape usage to double check our =
cartridge forecasts. I saw an increase of 2.75x instead of the =
expected 4x compared to the DLT8000s. Some digging on the Quantum web =
site yielded the SCSI Interface Guide for the SDLT drives. Turns out =
0x90 and 0x91 put the drive into SDLT220 mode. This document indicated =
the proper modes for the drives were 0x92 and 0x93. I manually loaded =
a labelled tape and confirmed using the front panel LEDs on the drive =
that my tapes were indeed formatted in SDLT220 format.
=20
I made the following st.conf change and observed that relabelling a tape =
did indeed put it in SDLT320 format...
=20
SDLT-data =3D 1,0x38,0,0x19639,4,0x90,0x91,0x92,0x93,3;
=20
My data per cartridge numbers were much better this weekend =
(>200GB/cart) and the performance was better as well.
Veritas confirmed yesterday that 0x92 and 0x93 are in fact the proper =
Mode selectors for these drives.
=20
Terry Green
tgreen AT mitra DOT com
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<BODY>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial><FONT =
size=3D2>A note of=20
advice for those using SDLT320 drives - check your st.conf settings<SPAN =
class=3D488441519-04032003> . </SPAN><SPAN=20
class=3D488441519-04032003> </SPAN><SPAN=20
class=3D488441519-04032003> </SPAN></FONT></FONT></SPAN></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><FONT face=3DArial size=3D2><SPAN =
class=3D061555813-04032003></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D061555813-04032003>I =
recently upgraded=20
my tape environment from DLT8000 to SDLT320 drives. I =
was given=20
the following settings, <SPAN=20
class=3D488441519-04032003> by Veritas support </SPAN>and =
assured=20
repeatedly that these were the proper settings for=20
SDLT320 drives.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><FONT face=3DArial><FONT =
size=3D2><SPAN=20
class=3D061555813-04032003></SPAN></FONT></FONT></FONT></FONT> </DIV=
>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN=20
class=3D061555813-04032003> </SPAN>SDLT-data =20
=3D 1,0x38,0,0x19639,4,0x90,0x91,0x9<SPAN=20
class=3D061555813-04032003>0</SPAN>,0x9<SPAN=20
class=3D061555813-04032003>1</SPAN>,3;</FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><FONT face=3DArial=20
size=3D2></FONT></FONT></FONT> </DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial size=3D2>We did =
some data=20
integrity testing and all looked good. The initial =
performance looked=20
OK, not stellar but OK. I assumed the lackluster performance=20
indicated buffer tuning was required.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN =
class=3D061555813-04032003><FONT=20
face=3DArial size=3D2></FONT></SPAN></FONT></FONT> </DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial size=3D2>3 =
weeks in, I did=20
some initial review of tape usage to double check our cartridge=20
forecasts. I saw <SPAN=20
class=3D488441519-04032003> an increase </SPAN>of 2.75x =
instead of the=20
expected 4x compared to the DLT8000s. Some digging on the =
Quantum=20
web site yielded the SCSI Interface Guide for the SDLT drives. =
Turns=20
out 0x90 and 0x91 put the drive into SDLT220 =
mode. This=20
document indicated the proper modes for the drives were 0x92 and=20
0x93. I manually loaded a labelled tape and confirmed =
using=20
the front panel LEDs on the drive that my tapes were indeed =
formatted in=20
SDLT220 format.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN =
class=3D061555813-04032003><FONT=20
face=3DArial size=3D2></FONT></SPAN></FONT></FONT> </DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial size=3D2>I made =
the following=20
st.conf change and observed that relabelling a tape did indeed put it in =
SDLT320=20
format...</FONT></SPAN></DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial =
size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN=20
class=3D061555813-04032003> </SPAN>SDLT-data =20
=3D 1,0x38,0,0x19639,4,0x90,0x91,0x9<SPAN=20
class=3D061555813-04032003>2</SPAN>,0x9<SPAN=20
class=3D061555813-04032003>3</SPAN>,3;</FONT></FONT></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><FONT face=3DArial=20
size=3D2></FONT></FONT></FONT> </DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial size=3D2>My =
data per=20
cartridge numbers were much better this weekend (>200GB/cart) and the =
performance was better as well.</FONT></SPAN></DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial =
size=3D2>Veritas confirmed=20
yesterday that 0x92 and 0x93 are in fact the proper Mode selectors for =
these=20
drives.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN =
class=3D061555813-04032003><FONT=20
face=3DArial size=3D2></FONT></SPAN></FONT></FONT> </DIV>
<DIV><SPAN class=3D061555813-04032003><FONT face=3DArial size=3D2>Terry=20
Green</FONT></SPAN></DIV>
<DIV><SPAN class=3D061555813-04032003></SPAN><SPAN=20
class=3D061555813-04032003></SPAN></SPAN><FONT face=3DArial =
color=3D#000000=20
size=3D2><SPAN class=3D061555813-04032003><A=20
href=3D"mailto:tgreen AT mitra DOT com">tgreen AT mitra DOT
com</A></SPAN></FONT></DIV>=
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