For my personal reference (from http://jeff.blogs.ocjtech.us/2008/05/how-to-re-scan-scsi-bus-on-linux.html)
How to re-scan the SCSI bus on Linux:
echo “- – -” > /sys/class/scsi_host/host0/scan
Update: Tim Verhoeven has a more complete description of the re-scanning process.
http://misterd77.blogspot.com/2007/12/how-to-scan-scsi-bus-with-26-kernel.html
Hi!
About a year ago I’ve setup some linux RHEL 6 with multipath access to an HP EVA storage.
Today I needed to do it again, and to do so i needed to list all the path available to the storage device, here’s my command line (hope it helps someone else) to list all the path and volumes:
ls /dev/sd* | grep -E -v '[0-9]' | while read D ; do F=$(echo $D) ; \ echo -n $F ; echo -n " " ; scsi_id --page=0x83 --whitelisted --device=$F | \ sort -k 2 ; done | sort -k 2
The output should be something like this:
/dev/sda 3600508b1001c927a634cedb90322b49e /dev/sdb 3600508b4000744ff0000a00001fd0000 /dev/sdf 3600508b4000744ff0000a00001fd0000 /dev/sdj 3600508b4000744ff0000a00001fd0000 /dev/sdn 3600508b4000744ff0000a00001fd0000 /dev/sdd 3600508b4000744ff0000a000025c0000 /dev/sdh 3600508b4000744ff0000a000025c0000 /dev/sdl 3600508b4000744ff0000a000025c0000 /dev/sdp 3600508b4000744ff0000a000025c0000 /dev/sde 3600508b4000744ff0000a000025f0000 /dev/sdi 3600508b4000744ff0000a000025f0000 /dev/sdm 3600508b4000744ff0000a000025f0000 /dev/sdq 3600508b4000744ff0000a000025f0000 /dev/sdc 3600508b4000744ff0000a00002660000 /dev/sdg 3600508b4000744ff0000a00002660000 /dev/sdk 3600508b4000744ff0000a00002660000 /dev/sdo 3600508b4000744ff0000a00002660000
As you can see I’ve one available disk on this server, actually this one is a RAID1 (HW) config (sda), 16 paths to my storage device, that delivers 4 different volumes (4 paths to each volume).
Sometime later I’ll discuss the multipath configuration but for now i just wanted to leave the command line that help me list all the paths ids.
Cheers,
Pedro Oliveira