LVM and VxVM

More than three partitions seen on a system disk

 
Horia Barbul_2
Advisor

More than three partitions seen on a system disk

Hello

 

In an EVA Continuous Access data recovery solution the system disk of a BL860c (boot-from-SAN) was replicated. After the failback the ioscan on the system shows - apparently - more than three partitions :

 

disk      1  0/3/0/0/0/0.1.0.0.0.0.1  sdisk    CLAIMED     DEVICE       HP      HSV210

                           /dev/dsk/c1t0d1     /dev/rdsk/c1t0d1

                           /dev/dsk/c1t0d1s1   /dev/rdsk/c1t0d1s1

                           /dev/dsk/c1t0d1s2   /dev/rdsk/c1t0d1s2

                           /dev/dsk/c1t0d1s3   /dev/rdsk/c1t0d1s3

                           /dev/dsk/c1t0d1s4   /dev/rdsk/c1t0d1s4

                           /dev/dsk/c1t0d1s5   /dev/rdsk/c1t0d1s5

                           /dev/dsk/c1t0d1s6   /dev/rdsk/c1t0d1s6

                           /dev/dsk/c1t0d1s7   /dev/rdsk/c1t0d1s7

 

idisk –p issued on the disk fails :

 

# idisk -p /dev/rdisk/c1t0d1

idisk: Stat of disk failed(2)

 

But  idisk –a works fine and shows  – as it should – just three partitions:

 

# idisk -a /dev/rdsk/c1t0d1

idisk version: 1.32

 

EFI Alternate Header:

        Signature                 = EFI PART

        Revision                  = 0x10000

        HeaderSize                = 0x5c

        HeaderCRC32               = 0x31de90b9

        MyLbaLo                   = 0x95fffff

        MyLbaHi                   = 0x0

        AlternateLbaLo            = 0x1

        AlternateLbaHi            = 0x0

        FirstUsableLbaLo          = 0x22

        FirstUsableLbaHi          = 0x0

        LastUsableLbaLo           = 0x95fffdc

        LastUsableLbaHi           = 0x0

        Disk GUID                 = d3279cc0-6b87-11e0-8001-d6217b60e588

        PartitionEntryLbaLo       = 0x95fffde

        PartitionEntryLbaHi       = 0x0

        NumberOfPartitionEntries  = 0xc

        SizeOfPartitionEntry      = 0x80

        PartitionEntryArrayCRC32  = 0x5f5c71fd

 

  Alternate Partition Table (in 512 byte blocks):

    Partition 1 (EFI):

        Partition Type GUID       = c12a7328-f81f-11d2-ba4b-00a0c93ec93b

        Unique Partition GUID     = d3279e28-6b87-11e0-8002-d6217b60e588

        Starting Lba Lo            = 0x22

        Starting Lba Hi            = 0x0

        Ending Lba Lo              = 0xfa021

        Ending Lba Hi              = 0x0

    Partition 2 (HP-UX):

        Partition Type GUID       = 75894c1e-3aeb-11d3-b7c1-7b03a0000000

        Unique Partition GUID     = d3279e46-6b87-11e0-8003-d6217b60e588

        Starting Lba Lo            = 0xfa022

        Starting Lba Hi            = 0x0

        Ending Lba Lo              = 0x9537821

        Ending Lba Hi              = 0x0

    Partition 3 (HPSP):

        Partition Type GUID       = e2a1e728-32e3-11d6-a682-7b03a0000000

        Unique Partition GUID     = d3279e5a-6b87-11e0-8004-d6217b60e588

        Starting Lba Lo            = 0x9537822

        Starting Lba Hi            = 0x0

        Ending Lba Lo              = 0x95ff821

        Ending Lba Hi              = 0x0

#

 

Also - diskinfo issued on the "extra" partitions show a size of 0 (zero) Kbytes:

 

diskinfo -v /dev/rdsk/c1t0d1s1

SCSI describe of /dev/rdsk/c1t0d1s1:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 512000 Kbytes

...............................................

# diskinfo -v /dev/rdsk/c1t0d1s2

SCSI describe of /dev/rdsk/c1t0d1s2:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 77720576 Kbytes

.................................................

# diskinfo -v /dev/rdsk/c1t0d1s3

SCSI describe of /dev/rdsk/c1t0d1s3:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 409600 Kbytes

.....................................................

# diskinfo -v /dev/rdsk/c1t0d1s4

SCSI describe of /dev/rdsk/c1t0d1s4:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 0 Kbytes

......................................................

# diskinfo -v /dev/rdsk/c1t0d1s5

SCSI describe of /dev/rdsk/c1t0d1s5:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 0 Kbytes

....................................................

# diskinfo -v /dev/rdsk/c1t0d1s6

SCSI describe of /dev/rdsk/c1t0d1s6:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 0 Kbytes

.................................................

# diskinfo -v /dev/rdsk/c1t0d1s7

SCSI describe of /dev/rdsk/c1t0d1s7:

             vendor: HP

         product id: HSV210

               type: direct access

               size: 0 Kbytes

 

Should I expect for the "extra" partitions device files for s4, s5, s6 and s7 to disappear after issuing the

 

idisk –rw /dev/rdsk/c1t0d1

 

command, or should I consider removing them by using rmsf ? What might have caused their appearance ? Would they reappear if the server is rebooted or insf -e is issued ?

 

Thank you

Horia