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Here is the solution I found on the mailing lists:
This has worked for me before on the V245:
You may want to remove all the hard drives except the troubled one
ok setenv fcode-debug? true
fcode-debug? = true
ok setenv auto-boot? false
auto-boot? = false
a) /pci at 1e,600000/pci at 0/pci at a/pci at 0/pci at 8/scsi at 1/disk
b) /pci at 1e,600000/pci at 0/pci at 1/pci at 0/ide at 1f/cdrom
c) /pci at 1e,600000/pci at 0/pci at 1/pci at 0/ide at 1f/disk
q) NO SELECTION
Enter Selection, q to quit: q
ok select /pci at 1e,600000/pci at 0/pci at a/pci at 0/pci at 8/scsi at 1
Volume 0 Target 0 Type IM (Integrated Mirroring)
2 Members 143112591 Blocks, 73 GB
Target 4 FUJITSU MAY2073RCSUN72G 0401
Target 1 FUJITSU MAY2073RCSUN72G 0401
ok 0 delete-volume
The volume and its data will be deleted
Are you sure (yes/no)? [no] yes
Volume 0 has been deleted
No volumes to show
ok setenv auto-boot? true
auto-boot? = true
ok setenv fcode-debug? false
fcode-debug? = false
You can now boot the system, run devfsadm to see the fixed hard
and run the format utility to detect the type and label the drive.
Note that when you run the show-volumes command one of the physical
disks in the array will be shown as Missing.
Actually I have one Sun Fire T5140 and on os side it shows only one disk.. and i want to break the mirror .i.e. hard mirror using raidctl -d.
Is it possible to break the hard mirror using the steps given, without loosing the data on main root disk?
If any process is there then please let me know and i want to try it.
from the man page:
"-d [-f] volume
Delete the RAID volume specified as volume. The volume is specified in canonical form (for example, c0t0d0).
When a volume is deleted, all data is lost. Therefore, unless the -f option is specified, raidctl prompts the user for confirmation before deleting the volume.
When a RAID 1 volume is deleted from a LSI1020, LSI1030, SAS1064, or SAS1068 HBA, the primary and secondary disks are split. If the volume was in SYNCING state, the primary will contain the data, and the secondary will not. If the volume state was OPTIMAL, both disks will contain a complete image of the data."