ioscan output shows 4 character address

[rajesh73]

os  name hp-ux 11.23

i want to know from the below output why c1t0d0 show 4 address that is  (c1t0d0s0,c1t0d0s1,c1t0d0s2,c1t0d0s3)

output

unix1$ioscan -fnC disk
Class        I  H/W Path       Driver    S/W State   H/W Type     Description
==============================================================================
disk         1  0/2/1/0.0.0.0.0  sdisk     CLAIMED     DEVICE       HP      IR Volume
                              /dev/dsk/c1t0d0     /dev/dsk/c1t0d0s2   /dev/rdsk/c1t0d0    /dev/rdsk/c1t0d0s2
                              /dev/dsk/c1t0d0s1   /dev/dsk/c1t0d0s3   /dev/rdsk/c1t0d0s1  /dev/rdsk/c1t0d0s3
unix1$

[Torsten.]

This is pretty normal for an itanium boot disk.

There are 3 partitions on the disk (s1...3); 1 for EFI, 2 for HPUX, 3 for service tools.

And by the way, this is an  IR Volume - Integrated RAID, hardware RAID provided by the internal LSI SAS controller.

[rajesh73]

then why it shows 4 address

[Torsten.]

4 special device files, 1 for the disk itself, 1 for each partition