Re-scan the disk after replacing the HBA card in Linux

The operation method to check the WWN number of the HBA card is as follows:

[root@361way ~]# cat /sys/class/fc_host/host*/port_name

0x10000090fa4849fe

0x10000090fa4849ff

You can also refer to the article to view the wwn number under linux.

After the WWN number is changed, the system cannot directly update the mounted backend storage disk. If you need to scan the disk again, you can use the following methods to scan the disk:

# cd /sys/class/scsi_host/host4/

# echo '- - - ' > scan

echo "1" > /sys/class/fc_host/host/issue_lip //Some storages or systems do not have scan files, which can be identified by the issue_lip file

Note:

You can run fdisk -l before scanning and compare the results of fdisk -l after scanning. If the replacement is successful, you will find that the latter can see more results than the former. Therefore, before such operations, it is best to make a backup of disk-related information such as df, fdisk, mount, fstab, etc. After scanning, it is safest to compare it with the original data.

It doesn't matter if you can't remember the above scan command, you can achieve the same effect by restarting the host.

Before and after scanning the disk, you can check the storage mount information by viewing /proc/scsi/scsi

[root@361way ~]# cat /proc/scsi/scsi

Attached devices:

Host: scsi0 Channel: 00 Id: 00 Lun: 00

Vendor: hp Model: DVD D DS8D3SH Rev: HHE8

Type: CD-ROM ANSI SCSI revision: 05

Host: scsi3 Channel: 03 Id: 00 Lun: 00

Vendor: HP Model: P410i Rev: 6.62

Type: RAID ANSI SCSI revision: 05

Host: scsi3 Channel: 00 Id: 00 Lun: 00

Vendor: HP Model: LOGICAL VOLUME Rev: 6.62