Scan FC or iSCSİ Disk on Linux, remove and format without reboot if fdisk want reboot it and find out WWN of HBA

Many times i was searching on internet and collect many thing from many page about add a new disk to linux OS after that decide to put everything on one place

After assign the LUN from storage to host , on command line of you server pls type below

echo “- – – ” > /sys/class/scsi_host/*host_number*/scan

You can find out host number under ;


On my servers i can see many hosts there like host0,host1,host2 then don’t need to think twice execute the command with all or I’m not %100 sure but on Redhat6/Centos6 you can find out vi execute command below to get HBA ports

 cat /sys/class/fc_host/host

then with fdisk -l you should find the disk , if you are using MPIO then you should check /dev/mapper/mpath* or /dev/dm-*

When execute fdisk and save the new partition sometimes you can get “You should restart to host to use new partition” , don’t worry execute command below


but sometimes only execute this can work, sometimes no , then pls execute below

partprobe /dev/mapper/mpath1

Also sometime you need to remove such assigned partition , to do it pls unmount from OS, unassign from storage and read the last link under related links for short see below

# echo 1 > /sys/block/devName/device/delete
# echo 1 > /sys/block/sdc/device/delete

Extra ….

To find out HBA WWNs pls execute below

[root@kahin1 ~]# cat /sys/class/fc_host/host5/port_name

Related Links and many thanks to they

Pls command this article if something missing and not working or you do not find out what you are searching


Posted on 26/07/2012, in Linux and tagged , . Bookmark the permalink. Leave a comment.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: