Specifications

Administration Guide
264 VMware, Inc.
Each!SCSI!controllerʹs!subdirectory!contains!entries!for!the!SCSI!devices!on!that!
controller,!numbered!by!SCSI!target!ID!and!LUN!(logical!unit!number).!Run!cat!on!
each!target!ID:LUN!pair!to!get!information!about!the!device!with!that!target!ID!and!
LUN.!For!example,!type!this!command:!
cat /proc/vmware/scsi/vmhba0/1:0
The!following!
information!is!displayed:
Vendor: SEAGATE Model: ST39103LW Rev: 0002
Type: Direct-Access ANSI SCSI revision: 02
Size: 8683 Mbytes
Queue Depth: 28
Partition Info:
Block size: 512
Num Blocks: 17783240
num: Start Size Type
4: 1 17526914 fb
Partition 0:
VM 11
Commands 2
Kbytes read 0
Kbytes written 0
Commands aborted 0
Bus resets 0
Partition 4:
Commands 336
Kbytes read 857
Kbytes written 488
Commands aborted 0
Bus resets 0
This!information!helps!you!determine!the!SCSI!target!ID!to!use!in!the!storage!
configuration!page,!as!displayed!by!the!VMware!Management!Interface.!See!
“Configuring!Storage:!Disk!Partitions!and!File!Systems”!on!page 196.
Sharing the SCSI Bus
Normally,!VMware!ESX!Server!enforces!locking!and!does! not!allow!two!virtual!
machines!to!access!the!same!virtual!disk!(VMFS!file)!at!the!same!time.!If!a!second!
virtual!machine!tries!to!access!a!VMFS!file,!it!gets!an!error!and!does!not!power!on.
It!is!often!useful!to!have!
more!than!one!virtual!machine!share!a!disk!to!provide!high!
availability.!This!configuration!is!commonly!used!for!disk‐based!failover,!in!which!one!
machine!takes!over!running!an!application!when!the!primary!machine!fails.!The!data!
required!for!the!application!is!typically!stored!on!a!shared!disk,!so!the!backup
!machine!