Adding storage to servers is part of every day work. this can be anything from a virtual disk on a virtual machine, to LUN’s presented from some external storage system.

When the new disk has been added, ususally nothing happens. You need to scan for the new disk/disks in order to operate them. Theres a tool called for doing this specific task, but sometimes you don’t have that, then you need to do it manually, and it’s actually not that difficult.

You then need to echo “- – -” to the scsi system. I have found a lot of different methods to do the same thing, a lot of them telling you to do something like: echo “- – -” >> /sys/class/scsi_host/hostxx/scan where xx can be anything, and sometimes there’s a lot, so typing all the different host numbers is not optimal. Then someone suggests a for loop, like: for i in $(/sys/class/scsi_host/hosts); do echo “- – -” /sys/class/scsi_host/host$i/scan; done

I have tried them all (I think) but in my opinion, the best and easiest solution is the one below, as it is pretty easy to remember:

echo "- - -" | sudo tee /sys/class/scsi_host/host*/scan

List your newly installed disk with lsblk and partition them with fdisk

One Responses

  • Pourya

    Thank you.
    It was perfect and really saved me 🙂


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