Very Computer

by **Wen-King** » Tue, 17 Sep 2002 02:26:35

I have two SCSI drives that are actually IDE drives behind SCSI/IDE
converters. I am using solaris 9 on an Ultra Sparc. Everything works
except RAID. Volume manager consider the two drives to be the same
drive because the both converters return empty string for
manufacturer's serial number. Is there a way to tell the system not to
look at serial number? Is there a way to tell the system I am not
using redundant paths, and there are really 2 drives on the SCSI bus?

% iostat -En

c1t0d0 Soft Errors: 2 Hard Errors: 0 Transport Errors: 0
Vendor: IC35L120 Product: AVVA07-0 Revision: VA6O Serial No:
Size: 123.52GB <123520155648 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 2 Predictive Failure Analysis: 0

c1t1d0 Soft Errors: 2 Hard Errors: 0 Transport Errors: 0
Vendor: IC35L120 Product: AVVA07-0 Revision: VA6O Serial No:
Size: 123.52GB <123520155648 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 2 Predictive Failure Analysis: 0

by **Klaus Gro** » Tue, 17 Sep 2002 14:42:29

> I have two SCSI drives that are actually IDE drives behind SCSI/IDE
> converters. I am using solaris 9 on an Ultra Sparc. Everything works
> except RAID. Volume manager consider the two drives to be the same
> drive because the both converters return empty string for
> manufacturer's serial number. Is there a way to tell the system not to
> look at serial number? Is there a way to tell the system I am not
> using redundant paths, and there are really 2 drives on the SCSI bus?

> ----- snipp -----

Hey,

i think not, cause Veritas is using the world wide number (wwn), if
your converter doesn#t give this information to the OS, i think you have
no chance.

For RAID 5 you need at last min. three disks, two for data and one for the
raid 5 information.

CU
Klaus Grote

by **Wen-King** » Tue, 17 Sep 2002 23:54:30

Quote:
>For RAID 5 you need at last min. three disks, two for data and one for the
>raid 5 information.

I am trying to use RAID 1. With IDE at ~$1/gig, I see no benefit
going to RAID 5. It is faster, cheaper (since I save on the number
of converters use), and more reliable (fewer moving parts).

by **Klaus Gro** » Wed, 18 Sep 2002 14:51:14

> >For RAID 5 you need at last min. three disks, two for data and one for the
> >raid 5 information.

> I am trying to use RAID 1. With IDE at ~$1/gig, I see no benefit
> going to RAID 5. It is faster, cheaper (since I save on the number
> of converters use), and more reliable (fewer moving parts).

Hey,

sorry, I've read only RAID and implemented RAID 5 by myself.
The only way to disable Multipathing under VxVM is this:

------------------------------------------------
The '/etc/vx/vxdmp.exclude' file

The file /etc/vx/vxdmp.exclude controls which disks and/or paths are
to be excluded from multi-pathing. When you run the vxdiskadm command
to
prevent multi-pathing, all that really happens is entries are put into
this file.

Here is what this file looks like after we disabled multi-pathing in
our above tutorial:

# cat /etc/vx/vxdmp.exclude

exclude_all 0
paths

#
controllers
#
product
#
pathgroups
#

------------------------------------------------

number
in VxVM. If your converter can not emulate this, or gives you two
different
wwn, than Veritas won't find two different disks.
Perhaps you tried SDS from SUN? SDS didn't follow the wwn.

Hoped to help you

CU
Klaus Grote

Very Computer

Need help disabling SCSI multipath

Need help disabling SCSI multipath

Need help disabling SCSI multipath

Need help disabling SCSI multipath

Need help disabling SCSI multipath