HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 210
Why Are There ioscan Entries for LUNs I Didn't Bind?, diskinfo /dev/rdsk/c9t1d0
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VSA is an enhancement that increases the number of LUNs that can be addressed on a fibre channel disk array to 16382 (214). This compares with the 8 LUN limit imposed by PDA. The HP SureStore E Disk Array FC60 requires that 32 LUNs (0 - 31) be addressable. To implement VSA, the fibre channel driver creates four virtual SCSI busses, each capable of supporting up to eight LUNs. Each virtual SCSI bus supports the following LUNs: Virtual SCSI Bus 0 1 2 3 Supported LUNs 0 - 7 8 - 15 16 - 23 24 - 31 The LUNs for each virtual SCSI bus are numbered 0 - 7, but reflect the LUN numbers assigned to each bus. For example, LUN 0 on virtual SCSI bus 2 is really LUN 16 on the disk array. The virtual SCSI bus is identified by the next-to-last segment of the hardware path. For example, in the following ioscan entry, the value identifying virtual SCSI bus 1 is shown in bold. Figure 79 shows all four virtual SCSI bus entries for a disk array. disk 4 8/8.8.0.0.0.1.0 sdisk CLAIMED DEVICE HP A5277A /dev/dsk/c9t1d0 /dev/rdsk/c9t1d0 Why Are There ioscan Entries for LUNs I Didn't Bind? By default, an ioscan entry is made for LUN 0 of each virtual SCSI bus. This does not imply that there is an actual LUN 0 bound on the disk array. To determine if there is a LUN on the bus, use the diskinfo command. For example, the sample entry above is for LUN 0 on virtual SCSI bus 1, or LUN 8. To determine if there is a LUN on virtual SCSI bus 1, perform a diskinfo command on the raw device file for that entry as follows: diskinfo /dev/rdsk/c9t1d0 210 Verifying Disk Array Connection