We had our Raid controller to go bad on Our server so we change the controller & recreate the raid Array .Unfortunately we have lost the configuration (Raid 10 ) so we recreated it , When the server came back one of the LUN-0 was recognized with existing Signature but it's empty the Second LUN-1 came back without problems and all Files vd can be access .
How can we recover or restore information on first LUN-0
Intel Raid Controller:
4x 2 tb HD
Raid1 +Raid1 @ Raid 0 = RAID 10
Split into Two 1818 volumes
Volume 1 = LUN-0
Volume 2 = LUN1
In your case you replaced RAID Controller and recreated "RAID Metadata - without initilize / format the acutal data"
But Replacement of RAID Controller will cause the UUID mismatch of Virtual Disks..
Below KB's should help you to resolve.. I used KB 1011387 (After replacing my PERC RAID card on Dell server - to solve your kind of problem)
Hope you have backup..
Regards - Purna
No i think i found an issue because i tried to recreate the lun i misakenly created new lun with block size 1 instead of 8 now it sees it as
We are not supposed to change Block size of VMFS file system - while data exists on it..
If done so - We loose the data on it..
The block size on a datastore cannot be automatically changed as it is a file system property that can only be specified when the datastore is initially created.
Note: All data on a VMFS volume is lost when the datastore is recreated. Migrate or move all virtual machines and other data to another datastore. Back up all data before proceeding.
After RAID (meta data re-creation) - you Should have data..
Instead of LUN Recreate (VMFS - recreate with wrong or right block size) - we should have done re-signature on VMFS as per above KB to recover data.
Regards - Purna