Now to rescan the bus, use the following command # echo "-" > /sys/class/scsi_host/host0/scan You can use the echo command to scan each scsi host device as below. Before executing this command, keep the output of previous disks ( ioscan -f unC disk) handy. You can ask command to scan on hard disks with -C option i.e. In HPUX, we have dedicated ioscan command to scan new hardware.
If these utilities are not available, you still be able to scan them from OS. If the disk is from storage array then there are chances you have storage vendor utilities/scripts available to scan storage on server example: evainfo (for EVA storage), xpinfo (for XP12K storage), powermt (for EMC storage). To let the kernel know that a new disk is made available to server disk scanning is required. This tree needs to be updated with new disk information. The kernel has a know hardware tree with it. Once the disk / LUN is made available/visible to the server, the next step is to scan it.
If its a storage LUN then it’s masking and zoning at storage level to WWN of the server. If it’s a local then its an addition of disk in free disk slots attached to server. Adding a new disk to the system can be local or from storage. When you add a new disk to the system, you need to scan it so that kernel will be able to identify new hardware and assign a disk name to it.
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