[dm-devel] Dealing with constantly failing paths

[Özkan Göksu]

Hello.
I'm sorry to have e-mailed you here but I did not really find the answer.

When a disk starts to die slowly multipath starts to Failing & Reinstating
paths and this keeps forever.. (I'm using LSI-3008HBA card with SAS-JBOD
not FC-Network)
Because kernel do not echo to offline faulted disk. This is causing
terrible problems to me.

I'm using: multipath-tools 0.7.4-1
Linux DEV2 4.14.67-1-lts #1


Dmesg;
    Sep 13 11:20:17 DEV2 kernel: sd 0:0:190:0: attempting task abort!
scmd(ffff88110e632948)
    Sep 13 11:20:17 DEV2 kernel: sd 0:0:190:0: [sdft] tag#3 CDB: opcode=0x0
00 00 00 00 00 00
    Sep 13 11:20:17 DEV2 kernel: scsi target0:0:190: handle(0x0037),
sas_address(0x5000c50093d4e7c6), phy(38)
    Sep 13 11:20:17 DEV2 kernel: scsi target0:0:190:
enclosure_logical_id(0x500304800929ec7f), slot(37)
    Sep 13 11:20:17 DEV2 kernel: scsi target0:0:190: enclosure
level(0x0001),connector name(1   )
    Sep 13 11:20:17 DEV2 kernel: sd 0:0:190:0: task abort: SUCCESS
scmd(ffff88110e632948)
    Sep 13 11:20:18 DEV2 kernel: device-mapper: multipath: Failing path
130:240.
    Sep 13 11:25:34 DEV2 kernel: device-mapper: multipath: Reinstating path
130:240.
Full dmesg example: https://paste.ubuntu.com/p/H9NMWxNfgD/

As you can see kernel aborted the mission and after that multipath failed.
So I want to get rid of this problem via telling Multipath "do not
Reinstate the path".
This method will keep dead the zombie disk.
If I dont kick the disk out its causing HBA reset and I'm losing all disk
in my pool and ZFS pool suspending.

I'm not saying this problem related to multipathd, I'm just thinking this
will save me.

So how can I tell the multipath do not Reinstate X times failed path?
Thank you.
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