Hello all, Since commit 6402eb875488240a403c6d032b9e81d7802801eb "add NAA Locally Assigned designator to 0x83 VPD page" added generated NAA descriptors, the scsi_id field that I was assigning to each target lun is no longer seen on the initiator side.This in turn breaks multipathing on my initiators because it is seeing unique identifiers even though the targets are the same. This is a trivial example of the issue that I see. I have a target disk (wwm 0x50014ee6036945cb) that I export with tgtd. Below is the descriptor on the target from the host system: [root@cio-5 ~]# sg_inq --page=0x83 /dev/sdj VPD INQUIRY: Device Identification page Designation descriptor number 1, descriptor length: 12 designator_type: NAA, code_set: Binary associated with the addressed logical unit NAA 5, IEEE Company_id: 0x14ee Vendor Specific Identifier: 0x6036945cb [0x50014ee6036945cb] I run two instances of tgtd on two seperate Infiniband interfaces and export the target on both so that I can use multipathd to provide redundancy. I configure the lun using the following targets.conf file. default-driver iser <target iqn.2012-07.com.cacheio:cio-5.cio-ATA-WDC_WD5000LPVX-5-350014ee6036945cb> <backing-store /dev/disk/cacheio/ATA-WDC_WD5000LPVX-5-350014ee6036945cb> lun 1 vendor_id "ATA " product_id "WD5000LPVX-5" product_rev "1A01" scsi_sn "WX81A33E1930" scsi_id 350014ee6036945cb bs-type aio mode_page "0x0A:1:4:0x01:0x04:0x0:0x0" write-cache off </backing-store> </target> Then I connect the initiator to the lun over the two paths. They appear as sdb and sdc. Now when I look at the descriptors from the initiator, I see two descriptors for each lun: [root@cio-2 ~]# sg_inq --page=0x83 /dev/sdb VPD INQUIRY: Device Identification page Designation descriptor number 1, descriptor length: 40 designator_type: T10 vendor identification, code_set: ASCII associated with the addressed logical unit vendor id: 350014ee vendor specific: 6036945cb Designation descriptor number 2, descriptor length: 12 designator_type: NAA, code_set: Binary associated with the addressed logical unit NAA 3, Locally assigned: [0x3000000200000001] [root@cio-2 ~]# sg_inq --page=0x83 /dev/sdc VPD INQUIRY: Device Identification page Designation descriptor number 1, descriptor length: 40 designator_type: T10 vendor identification, code_set: ASCII associated with the addressed logical unit vendor id: 350014ee vendor specific: 6036945cb Designation descriptor number 2, descriptor length: 12 designator_type: NAA, code_set: Binary associated with the addressed logical unit NAA 3, Locally assigned: [0x3000000100000001] Notice that the NAA descriptors are now different even though the target is the same! [root@cio-2 tgt]# scsi_id --whitelisted --page=0x83 /dev/sdb 33000000200000001 [root@cio-2 tgt]# scsi_id --whitelisted --page=0x83 /dev/sdc 33000000100000001 This has the effect of breaking multipathd because the identifiers no longer match... [root@cio-2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 93.2G 0 disk ├─sda1 8:1 0 1000M 0 part /boot └─sda2 8:2 0 87.9G 0 part ├─vg_cio-lv_root (dm-0) 253:0 0 78.1G 0 lvm / └─vg_cio-lv_home (dm-1) 253:1 0 9.8G 0 lvm /home sdb 8:16 0 465.8G 0 disk └─33000000200000001 (dm-2) 253:2 0 465.8G 0 mpath sdc 8:32 0 465.8G 0 disk └─33000000100000001 (dm-3) 253:3 0 465.8G 0 mpath [root@cio-2 tgt]# multipath -ll 33000000100000001 dm-3 ATA,WD5000LPVX-5 size=466G features='0' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=-1 status=active `- 32:0:0:1 sdc 8:32 active ready running Oct 16 19:19:06 | sdb: alua not supported 33000000200000001 dm-2 ATA,WD5000LPVX-5 size=466G features='0' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=-1 status=active `- 31:0:0:1 sdb 8:16 active ready running I've reverted the commit for my local systems to restore the previous behavior. But I'm interested in correctly assigning the NAA instead of using the generated one. Eric
Attachment:
signature.asc
Description: OpenPGP digital signature
