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[Vinay Prasad M <vpshelvankar@xxxxxxxxx>]

** Also affects: os-brick
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1493350

Title:
  Attach Volume fail : Cinder - ISCSI device symlinks under /dev/disk
  /by-path in hex.

Status in Cinder:
  Confirmed
Status in OpenStack Compute (nova):
  Opinion
Status in os-brick:
  New

Bug description:
  As part of POC for an enterprise storage we have implemented an ISCSIDriver.
  Volume operation works as expected.

  Facing an issue with attach volume. Request your help.

  1. If the volume lun id in backend storage is less than 255 attach volume works fine. Symlinks in /dev/disk/by-path is as below
  lrwxrwxrwx 1 root root   9 Jun 18 15:18 ip-192.168.5.100:3260-iscsi-iqn.1989-10.jp.co.xyz:storage.ttsp.2ec7fdda.ff5c4a16.0-lun-169 -> ../../sde
  lrwxrwxrwx 1 root root   9 Aug 26 14:47 ip-192.168.5.100:3260-iscsi-iqn.1989-10.jp.co.xyz:storage.ttsp.2ec7fdda.ff5c4a16.0-lun-172 -> ../../sdi

  2. If volume lun id is more than 255, /dev/disk/by-path is an hexadecimal number and hence attach volume is failing with message Volume path not found.  Symlinks in /dev/disk/by-path is as below [hexadecimal lun id  according to SCSI standard ( REPORT LUNS)]
  lrwxrwxrwx 1 root root   9 Aug 26 14:47 ip-192.168.5.100:3260-iscsi-iqn.1989-10.jp.co.xxx:storage.ttsp.2ec7fdda.ff5c4a16.0-lun-0x016b000000000000 -> ../../sdh
  lrwxrwxrwx 1 root root   9 Jun 18 15:18 ip-192.168.5.100:3260-iscsi-iqn.1989-10.jp.co.xxx:storage.ttsp.2ec7fdda.ff5c4a16.0-lun-0x0200000000000000 -> ../../sdc

  Please provide your suggession.

  I would suggest cinder utility to have a check of both with normal
  lun-id in /dev/disk/by-path as well as hexadecimal lunid.

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