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Re: [dm-devel] Multipath and HSG80 phase 2



Please check!!!

in main.c no zalloc of mpp structure before using it why?
in dmparser.c in the merge_words you assume the return of realloc was the
same of the passed ptr ?, if it is not the value of p may points to a gangle
reference, so you may write a "space" char in an undefined memory
location...

Howewer, after fixing the tools this is the result:


after multipathd startup:

Dec  9 12:17:34 m3 multipathd: --------start up--------
Dec  9 12:17:34 m3 multipathd: read /etc/multipath.conf
Dec  9 12:17:34 m3 multipathd: add /sbin/multipath to binvec
Dec  9 12:17:34 m3 multipathd: add /sbin/scsi_id to binvec
Dec  9 12:17:34 m3 multipathd: add /bin/false to binvec
Dec  9 12:17:34 m3 multipathd: --------start up--------
Dec  9 12:17:34 m3 multipathd: already running : out
Dec  9 12:17:34 m3 multipathd: start DM events thread
Dec  9 12:17:34 m3 multipathd: initial reconfigure multipath maps
Dec  9 12:17:34 m3 multipathd: path checkers start up
Dec  9 12:17:34 m3 multipathd: checking paths
Dec  9 12:17:34 m3 udev[1563]: creating device node '/dev/vcsa2'
Dec  9 12:17:34 m3 udev[1562]: creating device node '/dev/vcs2'
Dec  9 12:17:34 m3 multipathd: refresh devmaps list
Dec  9 12:17:34 m3 udev[1579]: creating device node '/dev/vcs3'
Dec  9 12:17:34 m3 multipathd: devmap disk1 :
Dec  9 12:17:34 m3 multipathd: \_ 0 71114623 multipath
Dec  9 12:17:34 m3 multipathd: refresh failpaths list
Dec  9 12:17:34 m3 multipathd: cciss!c0d0 blacklisted
Dec  9 12:17:34 m3 multipathd: dm-0 blacklisted
Dec  9 12:17:34 m3 multipathd: fd0 blacklisted
Dec  9 12:17:34 m3 udev[1605]: creating device node '/dev/vcsa3'
Dec  9 12:17:34 m3 multipathd: hda blacklisted
Dec  9 12:17:34 m3 udev[1610]: creating device node '/dev/vcs4'
Dec  9 12:17:34 m3 udev[1615]: creating device node '/dev/vcsa4'
Dec  9 12:17:34 m3 udev[1617]: creating device node '/dev/vcsa5'
Dec  9 12:17:34 m3 udev[1616]: creating device node '/dev/vcs5'
Dec  9 12:17:34 m3 udev[1625]: creating device node '/dev/vcs6'
Dec  9 12:17:34 m3 udev[1630]: creating device node '/dev/vcsa6'
Dec  9 12:17:34 m3 multipathd: loop0 blacklisted
Dec  9 12:17:34 m3 multipathd: loop1 blacklisted
Dec  9 12:17:34 m3 multipathd: loop2 blacklisted
Dec  9 12:17:34 m3 multipathd: loop3 blacklisted
Dec  9 12:17:34 m3 multipathd: loop4 blacklisted
Dec  9 12:17:34 m3 multipathd: loop5 blacklisted
Dec  9 12:17:34 m3 multipathd: loop6 blacklisted
Dec  9 12:17:34 m3 multipathd: loop7 blacklisted
Dec  9 12:17:34 m3 multipathd: set tur path checker for sda
Dec  9 12:17:34 m3 multipathd: path checker startup : 8:0
Dec  9 12:17:34 m3 multipathd: set tur path checker for sdb
Dec  9 12:17:34 m3 multipathd: path checker startup : 8:16
Dec  9 12:17:34 m3 multipathd: start up event loops
Dec  9 12:17:34 m3 multipathd: event checker startup : disk1
Dec  9 12:17:34 m3 multipathd: waiter->event_nr = 0

multipath -l -v3 shows:

disk1 (360001fe1001613800009205005470164)
[size=34723 MB][features="1 queue_if_no_path"][hwhandler="0"]
\_ øHbin [enabled]
 \_ 0:0:0:2 sda  8:0     [faulty][active]
\_ øHbin [first][enabled]
 \_ 0:0:1:2 sdb  8:16    [ready ][active]

(what's the mean of øHbin ?)

and dmsetup table shows:

disk1: 0 71114623 multipath 1 queue_if_no_path 0 2 2 round-robin 0 1 1 8:0 1000 round-robin 0 1 1 8:16 1000

now mount disk1 and begin random write, "restart other" on the hsg80 console:

Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 598616
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 597592
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 596568
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 595544
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 598624
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 599648
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 multipathd: /sbin/multipath -v 0 -S disk1
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 600672
Dec 9 12:21:08 m3 multipathd: devmap event on disk1
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 multipathd: disk1 : reconfigure multipath map
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 601696
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 601704
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 602208
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 603232
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 604256
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 604264
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 595544
Dec 9 12:21:08 m3 kernel: Buffer I/O error on device dm-0, logical block 74444
Dec 9 12:21:08 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:21:08 m3 kernel: Buffer I/O error on device dm-0, logical block 74445
Dec 9 12:21:08 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 605288
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 596568
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 606312
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 597592
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 598624
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 607336
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 598632
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 599656
Dec 9 12:21:08 m3 kernel: Device sda not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sda, sector 600680
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 607344
Dec 9 12:21:08 m3 kernel: Device sdb not ready.
Dec 9 12:21:08 m3 kernel: end_request: I/O error, dev sdb, sector 608096


after a while

Dec 9 12:21:14 m3 multipathd: checking paths
Dec 9 12:21:41 m3 multipathd: 8:16 : tur checker reports path is down
Dec 9 12:21:51 m3 multipathd: checking paths
Dec 9 12:22:00 m3 kernel: SCSI error : <0 0 1 2> return code = 0x10000
Dec 9 12:22:00 m3 last message repeated 2 times
Dec 9 12:22:00 m3 multipathd: refresh devmaps list
Dec 9 12:22:00 m3 multipathd: devmap disk1 :
Dec 9 12:22:00 m3 multipathd: \_ 0 71114623 multipath
Dec 9 12:22:00 m3 multipathd: refresh failpaths list
Dec 9 12:22:00 m3 multipathd: cciss!c0d0 blacklisted
Dec 9 12:22:00 m3 multipathd: dm-0 blacklisted
Dec 9 12:22:00 m3 multipathd: fd0 blacklisted
Dec 9 12:22:00 m3 multipathd: hda blacklisted
Dec 9 12:22:00 m3 multipathd: loop0 blacklisted
Dec 9 12:22:00 m3 multipathd: loop1 blacklisted
Dec 9 12:22:00 m3 kernel: Incorrect number of segments after building list
Dec 9 12:22:00 m3 multipathd: loop2 blacklisted
Dec 9 12:22:00 m3 kernel: counted 8, received 1
Dec 9 12:22:00 m3 multipathd: loop3 blacklisted
Dec 9 12:22:00 m3 kernel: req nr_sec 1024, cur_nr_sec 8
Dec 9 12:22:00 m3 multipathd: loop4 blacklisted
Dec 9 12:22:00 m3 kernel: printk: 1042 messages suppressed.
Dec 9 12:22:00 m3 multipathd: loop5 blacklisted
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75138
Dec 9 12:22:00 m3 multipathd: loop6 blacklisted
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 multipathd: loop7 blacklisted
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75139
Dec 9 12:22:00 m3 multipathd: path checker already active : 8:0
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 multipathd: path checker already active : 8:16
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75140
Dec 9 12:22:00 m3 multipathd: start up event loops
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 multipathd: event checker startup : disk1
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75141
Dec 9 12:22:00 m3 multipathd: waiter->event_nr = 4
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75142
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75143
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75144
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75145
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75146
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:00 m3 kernel: Buffer I/O error on device dm-0, logical block 75147
Dec 9 12:22:00 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:01 m3 multipathd: checking paths
Dec 9 12:22:01 m3 multipathd: 8:0 : tur checker reports path is up
Dec 9 12:22:01 m3 multipathd: /sbin/multipath -v 0 -S -D 8:0
Dec 9 12:22:01 m3 multipathd: reconfigure multipath map
Dec 9 12:22:01 m3 kernel: SCSI error : <0 0 1 2> return code = 0x10000
Dec 9 12:22:01 m3 last message repeated 2 times
Dec 9 12:22:01 m3 multipathd: /sbin/multipath -v 0 -S disk1
Dec 9 12:22:01 m3 multipathd: devmap event on disk1
Dec 9 12:22:01 m3 multipathd: disk1 : reconfigure multipath map
Dec 9 12:22:03 m3 multipathd: refresh devmaps list
Dec 9 12:22:03 m3 multipathd: devmap disk1 :
Dec 9 12:22:03 m3 multipathd: \_ 0 71114623 multipath
Dec 9 12:22:03 m3 multipathd: refresh failpaths list
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1002232
Dec 9 12:22:10 m3 kernel: printk: 117 messages suppressed.
Dec 9 12:22:10 m3 kernel: Buffer I/O error on device dm-0, logical block 142960
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1002240
Dec 9 12:22:10 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:10 m3 kernel: Buffer I/O error on device dm-0, logical block 125280
Dec 9 12:22:10 m3 kernel: lost page write due to I/O error on dm-0
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1003256
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1003264
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1004280
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1004288
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1005304
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1005312
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1006328
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1006336
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1007360
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1007368
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1008384
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1008392
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1009408
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1009416
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1010432
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1010440
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1011456
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1011464
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1012480
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1012488
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1013504
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1013512
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1014528
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1014536
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1015560
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1015568
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1016584
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1016592
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1017608
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1017616
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1018632
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1018640
Dec 9 12:22:10 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1019656
Dec 9 12:22:10 m3 kernel: end_request: I/O error, dev sda, sector 1019664
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1020680
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1020688
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1021704
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1021712
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1022728
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1022736
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1023752
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1023760
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1024776
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1024784
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1025800
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1025808
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1026824
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1026832
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1027848
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1027856
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1028872
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1028880
Dec 9 12:22:11 m3 kernel: SCSI error : <0 0 0 2> return code = 0x20000
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1029896
Dec 9 12:22:11 m3 kernel: end_request: I/O error, dev sda, sector 1029904
Dec 9 12:22:12 m3 kernel: REISERFS: abort (device dm-0): Journal write error in flush_commit_list
Dec 9 12:22:12 m3 kernel: REISERFS: Aborting journal for filesystem on dm-0
Dec 9 12:22:14 m3 multipathd: cciss!c0d0 blacklisted
Dec 9 12:22:14 m3 multipathd: dm-0 blacklisted
Dec 9 12:22:14 m3 multipathd: fd0 blacklisted
Dec 9 12:22:14 m3 multipathd: hda blacklisted
Dec 9 12:22:14 m3 multipathd: loop0 blacklisted
Dec 9 12:22:14 m3 multipathd: loop1 blacklisted
Dec 9 12:22:14 m3 multipathd: loop2 blacklisted
Dec 9 12:22:14 m3 multipathd: loop3 blacklisted
Dec 9 12:22:14 m3 multipathd: loop4 blacklisted
Dec 9 12:22:14 m3 multipathd: loop5 blacklisted
Dec 9 12:22:14 m3 multipathd: loop6 blacklisted
Dec 9 12:22:14 m3 multipathd: loop7 blacklisted
Dec 9 12:22:14 m3 multipathd: path checker already active : 8:0
Dec 9 12:22:14 m3 multipathd: path checker already active : 8:16
Dec 9 12:22:14 m3 multipathd: start up event loops
Dec 9 12:22:14 m3 multipathd: event checker startup : disk1
Dec 9 12:22:14 m3 multipathd: waiter->event_nr = 6
Dec 9 12:22:24 m3 multipathd: checking paths


now multipath -l -v3 shows:

disk1 (360001fe1001613800009205005470164)
[size=34723 MB][features="1 queue_if_no_path"][hwhandler="0"]
\_  [first][enabled]
 \_ 0:0:0:2 sda  8:0     [ready ][active]

and dmsetup table show:

disk1: 0 71114623 multipath 1 queue_if_no_path 0 1 1 round-robin 0 1 1 8:0 1000

howewer it seems the multipath target is unable to continue to write on /dev/sda where /dev/sdb goes down..
and multipathd does not recognize when /dev/sdb path returns up!
(in effect killing and restarting multipathd restores both paths)


thank you

Nicola Ranaldo



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