I can answer that one since I have just completed installing mirrored
drives.

NO. Not only should the drives be the same size but same block size and the
same manufacter. They should have HP firmware on them also. This can be
found using SCSIDSK2 under SYSDIAG. Also, be sure the drives have been
tested prior to creating the mirrored volume sets. What I learned would have
saved me a lot of aggravation. Purchase the drives and create a seperate
test volume. Run a diag program on those drives then when all tests pass,
create the mirror volumes. One last thing, make the partner drives identical
scsi id's. If you want to talk more about this I would be more than happy to
help out.

 CAPACITY UTILITY
 PDEV 10/4/16.5.0 is a(n) SEAGATE ST15150N disk drive


 Capacity Information:
 =====================
 Max Sector Address = 107
 Max Head Address = 20
 Max Cylinder Address = 3698
 Max Block Address = 8388313
 Current Block Size = 512                     << BLOCK SIZE
 Drive Capacity = 4294816768 bytes

 CAPACITY UTILITY COMPLETED



 INQUIRY UTILITY
 PDEV 10/4/16.5.0 is a(n) SEAGATE ST15150N disk drive


 Inquiry Information:
 ====================
 Product revision number = HP09        << HP FIRMWARE
 Physical addressing is disabled
 Block address mode
 The media is not removable
 Product serial number = 00768200
 Download Firmware Number = 01086912
 Drive Firmware Number =
 The meaning of some information in page C0 is unknown.  Hex:

 Vital Product Data Page Code C0 (hex):
 00  C0  00  20  30  31  30  38  36  39
 31  32  20  20  20  20  20  20  20  20
 34  30  34  33  00  00  00  00  20  20
 20  20  20  20  20  20
 Date info =
 Date Code = 09/25/95
 Jumper Settings:
       Delayed Motor Start = 0
       Motor Start (motor not started on power-up) = 0
       Write Protected = 0
       Parity Enabled = 0
       Drive ID =  5
 Terminator Power =  5

 Vital Product Data Page Code C3 (hex):
 00  C3  00  05  00  01  00  01  02

 INQUIRY UTILITY COMPLETED


Rick Clark
Senior Systems Analyst
WW&R
Cleveland, Ohio



-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of Mark Beard
Sent: Wednesday, February 23, 2000 6:57 AM
To: [log in to unmask]
Subject: Mirrored Disk/iX Query....


Howdy y'all

I know that the manual states that disks must be the same model to use for
Mirroring purposes but can anybody say whether or not a 4gb SCSI disk can
be mirrored to a 6 or 9 gb disk ??

Any info in this area would be greatly appreciated - if you have done this
and don't mind answering some questions please get in touch.

TIA,
Mark.



___________________________________________________________________________
                                         _____



  ---------------------------------------------------------
  This email is confidential to the ordinary user of the
  e-mail address to which it was addressed.  If you are not
  the intended recipient, please notify the sender
  immediately on (44) 171 638 5858 and delete the message
  from all locations in your computer. You should not copy
  this email or use it for any purpose, or disclose its
  contents to any person : to do so may be unlawful.

  Email is an informal method of communication and is
  subject to possible data corruption, either accidentally
  or on purpose. Flemings is unable to exercise control
  over the content of information contained in
  transmissions made via the Internet.  For these reasons
  it will normally be inappropriate to rely on information
  contained on email without obtaining written confirmation
  of it.
  ----------------------------------------------------------