DynamicRootDisk DRD

[masood bt]

I beleive there are two mirrored disks in VG00. The user plans to patch the server soon and wants to use DRD. I am thinking that we dont need DRD as we have mirrored disk. Can you please tell me if I am correct in suggesting to break the mirror while patching...instead of using DRD

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HP-UX B.11.23 U 9000/800 2861642732 unlimited-user license
# model
9000/800/rp4440
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# ioscan -fnC disk|pg
Class     I  H/W Path        Driver     S/W State   H/W Type     Description
=============================================================================
disk      0  0/0/3/0.0.0.0   sdisk      CLAIMED     DEVICE       _NEC    DVD+-RW ND-6650A
                            /dev/dsk/c0t0d0   /dev/rdsk/c0t0d0
disk      1  0/1/1/0.0.0     sdisk      CLAIMED     DEVICE       HP 73.4GMAX3073NC
                            /dev/dsk/c2t0d0   /dev/rdsk/c2t0d0
disk      2  0/1/1/0.1.0     sdisk      CLAIMED     DEVICE       HP 73.4GMAX3073NC
                            /dev/dsk/c2t1d0   /dev/rdsk/c2t1d0
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All other Disks are from EMC SYMMETRIX
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# lvlnboot -v
Boot Definitions for Volume Group /dev/vg00:
Physical Volumes belonging in Root Volume Group:
        /dev/dsk/c2t0d0 (0/1/1/0.0.0) -- Boot Disk
        /dev/dsk/c2t1d0 (0/1/1/0.1.0) -- Boot Disk
Boot: lvol1     on:     /dev/dsk/c2t0d0
                        /dev/dsk/c2t1d0
Root: lvol4     on:     /dev/dsk/c2t0d0
                        /dev/dsk/c2t1d0
Swap: lvol2     on:     /dev/dsk/c2t0d0
                        /dev/dsk/c2t1d0
Dump: lvol3     on:     /dev/dsk/c2t0d0, 0
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# setboot
Primary bootpath : 0/1/1/0.0.0
Alternate bootpath : 0/1/1/1.0.0

Autoboot is ON (enabled)
Autosearch is ON (enabled)
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# strings /etc/lvmtab
/dev/vg00
/dev/dsk/c2t0d0
/dev/dsk/c2t1d0
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[Torsten.]

>> I am thinking that we dont need DRD as we have mirrored disk

Well, in that case you need to shutdown, remove 1 disk, boot up, patch, reboot again.

If all works, insert the pulled disk again.

If fail, shutdown, remove the disk, insert the first removed disk, boot and insert the second disk again.

With DRD you just clone the VG00, patch it and do a single reboot.

If something goes wrong, just boot the original disk.

DRD is the better option.

[masood bt]

Thank you.

There are two fc ports being used by EMC SAN.

EMC doesnt support 11.23 march 2007 version apparently.

So cannot use SAN disk for DRD.

I found SCSI Ultra320 A6961-60011 in rp4440 and

SCSI C1010 Ultra160 Wide LVD in rp3440

Suggested the user to find a external scsi disk drive, connect it to the SCSI Ultra320 A6961-60011 in rp4440  and do the DRD.

Or

go for lvsplit