csi-lib-iscsi rescan

[Paul Monday]

I am using csi-lib-iscsi for a new CSI driver with a remote appliance that has multiple LUNs per target

For example, the following session has 7 different LUNs with different assigned numbers

iscsiadm -m session

tcp: [1] 10.80.44.165:3260,2 iqn.1986-03.com.sun:02:ab7b55fa-53ee-e5ab-98e1-fad3cc29ae57 (non-flash)

In my CSI driver when I hit the CreateVolume, I go to the remote appliance and create the new LUN.

On the ControllerPublish, I have to rescan the target (you can see what happens below)

It would be really helpful if I could add something like:

// Rescan sessions rescans all existing sessions for LUNs

func RescanSessions() (string, error) {

debug.Println("Rescan sessions...")

out, err := iscsiCmd("-m", "session", "--rescan")

return out, err

}

I think if I wanted to make it more 'localized' to the session id I would have to uplevel getCurrentSessions as well so I could grab the ID from the session.

As I'm new to the group and the github repo, I would appreciate any thoughts :-)

Still working through the contributor guidelines but this seemed to be the right place to start.

[root@paul ~]# lsscsi -d

[0:0:0:0]    disk    ATA      SAMSUNG MZ7LN512 2L6Q  /dev/sda [8:0]

[1:0:0:0]    disk    ATA      ST1000DM003-1SB1 CC63  /dev/sdb [8:16]

[6:0:0:1]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdc [8:32]

[6:0:0:3]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdd [8:48]

[6:0:0:5]    disk    SUN      ZFS Storage 7330 1.0   /dev/sde [8:64]

[6:0:0:7]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdf [8:80]

[6:0:0:9]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdg [8:96]

[6:0:0:11]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdh [8:112]

[6:0:0:13]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdi [8:128]

[root@paul ~]# iscsiadm -m session --rescan

Rescanning session [sid: 1, target: iqn.1986-03.com.sun:02:ab7b55fa-53ee-e5ab-98e1-fad3cc29ae57, portal: 10.80.44.165,3260]

[root@paul ~]# lsscsi -d

[0:0:0:0]    disk    ATA      SAMSUNG MZ7LN512 2L6Q  /dev/sda [8:0]

[1:0:0:0]    disk    ATA      ST1000DM003-1SB1 CC63  /dev/sdb [8:16]

[6:0:0:1]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdc [8:32]

[6:0:0:3]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdd [8:48]

[6:0:0:5]    disk    SUN      ZFS Storage 7330 1.0   /dev/sde [8:64]

[6:0:0:7]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdf [8:80]

[6:0:0:9]    disk    SUN      ZFS Storage 7330 1.0   /dev/sdg [8:96]

[6:0:0:11]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdh [8:112]

[6:0:0:13]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdi [8:128]

[6:0:0:15]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdj [8:144]

[6:0:0:17]   disk    SUN      ZFS Storage 7330 1.0   /dev/sdk [8:160]

[John Griffith]

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Hey Paul,

Not sure if you've seen this [1], but I think this will fix up your use case of multiple luns and rescans.  Let me know if this doesn't work for you for some reason but based on what you describe this should work I think.

[1]: https://github.com/kubernetes-csi/csi-lib-iscsi/pull/12

Thanks,

John