first of all, thanks for your reply.
in my program, it will use 128 LUNS at the most each target, so LUNS id will
not outnumber 255.
here is some syslog when the problem occur. you can search [sdf] to find some
info, like "[sdf] READ CAPACITY(16) failed" or "[sdf] Unit Not Ready", and "sdf: detected capacity change from 9664266240 to 0",
"Sense Key : Illegal Request [current]", "Add. Sense: Logical unit not supported"
------------------------------------------------------------------------------------------
#:~/tgt_debug$ cat syslog |grep -C 1 -e "sdf\|sd 7:0:0:4"
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.426520] sd 7:0:0:4: [sdf] 18875520 512-byte logical blocks: (9.66 GB/9.00 GiB)
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.426629] sd 7:0:0:3: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
--
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427236] sd 7:0:0:5: Attached scsi generic sg12 type 0
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427409] sd 7:0:0:4: [sdf] Write Protect is off
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427414] sd 7:0:0:4: [sdf] Mode Sense: 69 00 00 08
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427545] sd 7:0:0:5: [sdg] 2097280 512-byte logical blocks: (1.07 GB/1.00 GiB)
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427875] sd 7:0:0:4: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.427926] scsi 7:0:0:7: Direct-Access IET VIRTUAL-DISK 0001 PQ: 0 ANSI: 5
--
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.443681] sd 7:0:0:5: [sdg] Attached SCSI disk
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.458714] sdf: unknown partition table
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.460786] sd 7:0:0:4: [sdf] Attached SCSI disk
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.476316] sdh: unknown partition table
--
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.701790] Add. Sense: Reported luns data has changed
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.703810] sd 7:0:0:4: [sdf] Unit Not Ready
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.703814] sd 7:0:0:4: [sdf]
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.703815] Sense Key : Unit Attention [current]
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.703818] sd 7:0:0:4: [sdf]
Aug 26 16:02:25 10-120-120-35 kernel: [1144399.703821] Add. Sense: Reported luns data has changed
--
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.336478] Add. Sense: Reported luns data has changed
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.338547] sd 7:0:0:4: [sdf] Unit Not Ready
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.338552] sd 7:0:0:4: [sdf]
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.338554] Sense Key : Unit Attention [current]
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.338558] sd 7:0:0:4: [sdf]
Aug 26 16:02:26 10-120-120-35 kernel: [1144400.338561] Add. Sense: Reported luns data has changed
--
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752462] sdd: detected capacity change from 1073807360 to 0
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752987] sd 7:0:0:4: [sdf] Unit Not Ready
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752990] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752991] Sense Key : Unit Attention [current]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752994] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.752997] Add. Sense: Reported luns data has changed
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753254] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753472] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753655] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753666] sd 7:0:0:4: [sdf] READ CAPACITY(16) failed
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753672] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753674] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753676] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753677] Sense Key : Unit Attention [current]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753680] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753682] Add. Sense: Reported luns data has changed
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.753883] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754075] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754275] sd 7:0:0:4: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754286] sd 7:0:0:4: [sdf] READ CAPACITY failed
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754291] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754292] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754295] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754296] Sense Key : Unit Attention [current]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754299] sd 7:0:0:4: [sdf]
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.754301] Add. Sense: Reported luns data has changed
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.756150] sdf: detected capacity change from 9664266240 to 0
Aug 26 16:02:28 10-120-120-35 kernel: [1144402.756639] sd 7:0:0:5: [sdg] Unit Not Ready
--
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.925588] scsi 3:0:0:21: Direct-Access IET VIRTUAL-DISK 0001 PQ: 0 ANSI: 5
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.925959] sd 7:0:0:4: [sdf] 18875520 512-byte logical blocks: (9.66 GB/9.00 GiB)
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.926000] sd 3:0:0:21: Attached scsi generic sg59 type 0
--
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.927749] sd 3:0:0:22: [sdbc] 18875520 512-byte logical blocks: (9.66 GB/9.00 GiB)
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.927762] sdf: detected capacity change from 0 to 9664266240
Aug 26 16:02:29 10-120-120-35 kernel: [1144402.927843] scsi 3:0:0:23: Direct-Access IET VIRTUAL-DISK 0001 PQ: 0 ANSI: 5
--
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.191743] Add. Sense: Reported luns data has changed
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.195776] sd 7:0:0:4: [sdf] Unit Not Ready
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.195779] sd 7:0:0:4: [sdf]
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.195780] Sense Key : Unit Attention [current]
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.195784] sd 7:0:0:4: [sdf]
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.195786] Add. Sense: Reported luns data has changed
--
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.592427] sd 7:0:0:39: [sdbx] Mode Sense: 69 00 00 08
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.592809] sd 7:0:0:40: Attached scsi generic sg82 type 0
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.594486] sd 7:0:0:39: [sdbx] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.594696] sd 7:0:0:40: [sdby] 18875520 512-byte logical blocks: (9.66 GB/9.00 GiB)
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.595825] sd 7:0:0:40: [sdby] Write Protect is off
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.595831] sd 7:0:0:40: [sdby] Mode Sense: 69 00 00 08
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.596261] sd 7:0:0:40: [sdby] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.605687] sdbx: unknown partition table
--
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.610455] sd 7:0:0:39: [sdbx] Attached SCSI disk
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.613057] sd 7:0:0:40: [sdby] Attached SCSI disk
Aug 26 16:02:29 10-120-120-35 kernel: [1144403.617631] sd 3:0:0:13: [sdaf] Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
--
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.432518] md113: unknown partition table
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.662356] sd 7:0:0:4: [sdf] Synchronizing SCSI cache
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663163] sd 7:0:0:4: [sdf]
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663167] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663170] sd 7:0:0:4: [sdf]
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663172] Sense Key : Illegal Request [current]
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663175] sd 7:0:0:4: [sdf]
Aug 26 16:02:33 10-120-120-35 kernel: [1144407.663178] Add. Sense: Logical unit not supported
At 2014-09-11 02:21:59, "ronnie sahlberg" <ronniesahlberg@xxxxxxxxx> wrote:
>When you say "many devices" exactly how many are you referring to?
>Can you check if this problem you have only occur when you go from 255
>LUNs to something higher?
>
>
>The default LUN addressing scheme only allows LUNs numbered 0 to 255.
>To go to higher LUN numbers, which TGTD supports, doe require that you
>switch to a different addressing format
>and it may be that your initiator can not handle those other modes.
>
>Often it might look like you have LUNs 0-255 and then there is a jump
>to the next LUN which has the number 16640 if the initiator can not
>handle addressing modes properly.
>
>
>I do not know how IET does the LUN numbering.
>
>If you can collect a wireshark trace of iscsiadm --login from both
>STGT and IET then I can take a quick look and see if that is the issue
>you are facing.
>
>
>
>regards
>ronnie sahlberg
>
>
>On Mon, Sep 1, 2014 at 11:00 PM, 席智勇 <xizhiyong18@xxxxxxx> wrote:
>>
>> when i export many block device by tgt , in one single target , this means many exported lun in one target, to another
>> machine by iscsi。
>>
>> in another machine , attach the devices by open-iscsi。when i wait the
>> size of the device attached change from 0 to correct size， i create raid1 with two devices by mdadm。at this time, mdadm report like
>> "/dev/sdem is not suitable for this array.", i read the code of mdadm ,that because it cannot open the device。sometime it even report
>> "failed to open /dev/** after earlier success - aborting "。
>>
>> i do not know whether it's because i used the device when it's not ready yet, or the problem of tgt。
>>
>> all the above said happened when many target lun(tgt) created at the same
>> time concurrently。it do not happen in nomal time. when i change tgt to iet, it
>> do not happen either。
>>
>>
>>
>> tgt version: 1.0.48
>>
>> open-iscsi version:iscsiadm version 2.0-873
>>
>> linux system: Linux 3.10.40-amd64 GNU/Linux
>>
>>
>>
>>
>>
>> -------------
>>
>> Zhiyong Xi
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