Editing /usr/bin/rescan-scsi-bus.sh

<code>/usr/bin/rescan-scsi-bus.sh</code><ref>https://github.com/hreinecke/sg3_utils/blob/master/scripts/rescan-scsi-bus.sh</ref> included in <code>[[sg3-utils]]</code> package.
:https://raw.githubusercontent.com/hreinecke/sg3_utils/master/scripts/rescan-scsi-bus.sh
* <code>rescan-scsi-bus.sh -h</code> 
* <code>rescan-scsi-bus.sh --alltargets</code>
* <code>rescan-scsi-bus.sh --remove</code>

== Discover new [[block devices]]: rescan-scsi-bus.sh -a ==
<pre>
rescan-scsi-bus.sh --alltargets or rescan-scsi-bus.sh -a
...
...
32 new or changed device(s) found.
0 remapped or resized device(s) found.
0 device(s) removed.
</pre>

<pre>
rescan-scsi-bus.sh
Scanning SCSI subsystem for new devices
Scanning host 0 for  SCSI target IDs  0 1 2 3 4 5 6 7, all LUNs
 Scanning for device 0 0 0 0 ...
.../...
Scanning host 1 for  all SCSI target IDs, all LUNs
Scanning host 2 for  SCSI target IDs  0 1 2 3 4 5 6 7, all LUNs
 Scanning for device 2 0 0 0 ...
.../...
Scanning host 3 for  all SCSI target IDs, all LUNs
0 new or changed device(s) found.
0 remapped or resized device(s) found.
0 device(s) removed.
</pre>
You may need to execute: <code>multipath -f</code> (flush) to remove unused devices and [[pvresize]] if your [[LUN]] has changed size.

:<code>rescan-scsi-bus.sh -i --issue-[[lip]]</code>

<pre>
 Scanning for device 32 0 0 0 ...
OLD: Host: scsi32 Channel: 00 Id: 00 Lun: 00
      Vendor: VMware   Model: Virtual disk     Rev: 2.0
      Type:   Direct-Access                    ANSI SCSI revision: 06
 Scanning for device 32 0 1 0 ...
NEW: Host: scsi32 Channel: 00 Id: 01 Lun: 00
      Vendor: VMware   Model: Virtual disk     Rev: 2.0
      Type:   Direct-Access                    ANSI SCSI revision: 06
1 new or changed device(s) found.
	[32:0:1:0]
0 remapped or resized device(s) found.
0 device(s) removed.
</pre>

== Remove block devices: rescan-scsi-bus.sh --remove  ==
<pre>
 View current block devices: lsblk
 rescan-scsi-bus.sh --remove or rescan-scsi-bus.sh -r

sg10 changed: LU not available (PQual 1)
REM: Host: scsi3 Channel: 00 Id: 00 Lun: 07
DEL:  Vendor: NETAPP   Model: LUN C-Mode       Rev: 9600
      Type:   Direct-Access                    ANSI SCSI revision: 05
0 new or changed device(s) found.
0 remapped or resized device(s) found.
4 device(s) removed.

 View block devices after command execution: lsblk

multipath -ll
3600a09803831416c592b4f566453774e dm-3 ##,##
size=250G features='2 pg_init_retries 50' hwhandler='0' wp=rw
</pre>

== Related commands ==
* <code>[[blkid]]</code>, <code>[[multipath -f]]</code>, <code>[[multipath -w]]</code>, <code>[[pvcreate]]</code>
* [[LVM scan commands]]

== Activities ==
# Understand differences between <code>[[pvscan]]</code> which list all physical volumes and <code>[[rescan-scsi-bus.sh]]</code>
# Read Change log: https://github.com/hreinecke/sg3_utils/blob/master/scripts/rescan-scsi-bus.sh
# [[Add a new disk]]

== See also ==
* {{HBA}}
* {{Linux block devices}}
* {{Linux Fibre Channel}}
* {{filesystems}}

[[Category:Storage]]
[[Category:Linux]]