Wednesday, 15 June 2011

Differentiate local storage from SAN LUN - Quick HOWTO


This is the nice information which i found on web. Its very useful. In many scenarios we want to Differentiate with local disks from SAN LUN. 
In the example below orange is a virtual disk on an internal RAID controller, green is a CD-ROM connected via an IDE controller, and the rest are SAN-connected SCSI disks where "hostN" refers to the instance of the Host Bus Adapter they are connected to. 

 # ls -l /sys/block/*/device

lrwxrwxrwx  1 root root 0 Sep 19 02:11 /sys/block/cciss!c0d0/device -> ../../devices/pci0000:00/0000:00:04.0/0000:0d:00.0/disk0 
lrwxrwxrwx  1 root root 0 Sep 19 02:11 /sys/block/hda/device -> ../../devices/pci0000:00/0000:00:1f.1/ide0/0.0
lrwxrwxrwx  1 root root 0 Sep 18 14:58 /sys/block/sda/device -> ../../devices/pci0000:00/0000:00:02.0/0000:13:00.0/host0/target0:0:0/0:0:0:0  
lrwxrwxrwx  1 root root 0 Sep 18 14:58 /sys/block/sdb/device -> ../../devices/pci0000:00/0000:00:02.0/0000:13:00.0/host0/target0:0:0/0:0:0:1 
lrwxrwxrwx  1 root root 0 Sep 18 14:58 /sys/block/sdc/device -> ../../devices/pci0000:00/0000:00:02.0/0000:13:00.0/host0/target0:0:0/0:0:0:64  
lrwxrwxrwx  1 root root 0 Sep 18 14:58 /sys/block/sdd/device -> ../../devices/pci0000:00/0000:00:02.0/0000:13:00.0/
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