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I'd have to protest the paragraph below. Every solaris box, except the most
recent ones (and sometimes even then) have been sold with disks & tapes
sharing busses. It's not uncommon to have small tape drives & boot drives
sharing the same internal bus.
Here's a recently purchased E6800
/dev/sg/c3t6l0: (/dev/rmt/0): "HP C5683A"
<snip>
/dev/sg/c3t0l0: (/dev/rdsk/c3t0d0): "FUJITSU MAN3184M SUN18G"
...showing a disk drive & the "internal" tape drive on single bus. It's
been like this for years, with CDs, tapes, & various types of disks sharing
SCSI busses.
I smell cop-out here from IBM.
$.02 - M
-----Original Message-----
From: Chris Madden [mailto:maddenca AT myrealbox DOT com]
Sent: Monday, April 28, 2003 4:04 PM
To: Veritas Users NetBackup (E-mail)
Subject: [Veritas-bu] ADDL SUMMARY: SAN Tape Drive / Storage / Host
Connectivity
<snippage>
Furthermore, older SCSI drivers were written using a single SCSI profile for
the whole adapter. This was fine since disk and tape were rarely, if ever,
mixed, so a single profile (one for disk or one for tape) could be used for
the whole adapter and work fine. Often this is not under the user's control
- the driver picks a profile based on what devices it sees. HBA drivers
could certainly be written to allow different profiles to be used for
different devices at the same time on a single adapter, but this is not yet
a common practice. Thus, if you do mix disk and tape on a single HBA, you
end up either using a disk profile for both disk and tape, or a tape for
both disk and tape. Some devices will be using a non-optimal profile.
<snippage>
Cheers,
-Chris
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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=098000923-28042003>I'd
have to protest the paragraph below. Every solaris box, except the most
recent ones (and sometimes even then) have been sold with disks & tapes
sharing busses. It's not uncommon to have small tape drives & boot
drives sharing the same internal bus.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003>Here's
a recently purchased E6800</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003>/dev/sg/c3t6l0: (/dev/rmt/0):
"HP C5683A"<BR><snip><BR>/dev/sg/c3t0l0:
(/dev/rdsk/c3t0d0): "FUJITSU MAN3184M SUN18G"</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003>...showing a disk drive & the "internal" tape
drive
on single bus. It's been like this for years, with CDs, tapes, &
various types of disks sharing SCSI busses.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=098000923-28042003>I
smell cop-out here from IBM.</SPAN></FONT></DIV>
<DIV><SPAN class=098000923-28042003> </DIV>
<DIV><SPAN class=098000923-28042003></SPAN><FONT face=Arial color=#0000ff
size=2>$<SPAN class=098000923-28042003>.02 - M</SPAN><BR></FONT></DIV></SPAN>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Chris Madden
[mailto:maddenca AT myrealbox DOT com]<BR><B>Sent:</B> Monday, April 28, 2003
4:04
PM<BR><B>To:</B> Veritas Users NetBackup (E-mail)<BR><B>Subject:</B>
[Veritas-bu] ADDL SUMMARY: SAN Tape Drive / Storage / Host
Connectivity<BR><BR></FONT></DIV>
<DIV>
<DIV><SPAN class=098000923-28042003><FONT face=Arial color=#0000ff
size=2> <snippage> </FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Furthermore, older SCSI drivers were written
using a single SCSI profile for the whole adapter. This was fine since disk
and tape were rarely, if ever, mixed, so a single profile (one for disk or
one
for tape) could be used for the whole adapter and work fine. Often this is
not
under the user's control - the driver picks a profile based on what devices
it
sees. HBA drivers could certainly be written to allow different profiles to
be
used for different devices at the same time on a single adapter, but this is
not yet a common practice. Thus, if you do mix disk and tape on a single HBA,
you end up either using a disk profile for both disk and tape, or a tape for
both disk and tape. Some devices will be using a non-optimal
profile.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=098000923-28042003> <snippage> </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Cheers,</FONT></DIV>
<DIV><FONT face=Arial
size=2>-Chris<BR><BR></FONT></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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