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Date:      Thu, 4 Oct 2018 17:32:46 +0200
From:      Jean-Marc LACROIX <Jean-Marc.Lacroix@unice.fr>
To:        freebsd-fs@freebsd.org
Subject:   Problem with ZFSD when replacing a failed disk
Message-ID:  <96665eb8-9ff6-9050-bd7d-7f9f1d3fe737@unice.fr>

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Hello,

    we encounter a problem on our storage solution which is constituted of
1 R630 + 3 JOBS MD1420 sas connected.(DELL)

    Our system is : 11.0-RELEASE-p9

    We use ZFSD to manage Spare disks

The problem appear when we have to change a failed disk as explained below.
We don't understand why the second spare is activated when the replace 
command is done;

Thanks in advance for your help.
Regards
JM

root@math12:/ # zpool status
   pool: zpool
  state: DEGRADED
status: One or more devices could not be opened. Sufficient replicas 
exist for
     the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
    see: http://illumos.org/msg/ZFS-8000-2Q
   scan: resilvered 238G in 11h3m with 0 errors on Sat Sep 29 19:47:28 2018
config:

     NAME                       STATE     READ WRITE CKSUM
     zpool                      DEGRADED     0     0     0
       raidz2-0                 ONLINE       0     0     0
         label/e0s0             ONLINE       0     0     0
         label/e1s0             ONLINE       0     0     0
         label/e2s0             ONLINE       0     0     0
         label/e0s1             ONLINE       0     0     0
         label/e1s1             ONLINE       0     0     0
         label/e2s1             ONLINE       0     0     0
       raidz2-1                 ONLINE       0     0     0
         label/e0s2             ONLINE       0     0     0
         label/e1s2             ONLINE       0     0     0
         label/e2s2             ONLINE       0     0     0
         label/e0s3             ONLINE       0     0     0
         label/e1s3             ONLINE       0     0     0
         label/e2s3             ONLINE       0     0     0
       raidz2-2                 ONLINE       0     0     0
         label/e0s4             ONLINE       0     0     0
         label/e1s4             ONLINE       0     0     0
         label/e2s4             ONLINE       0     0     0
         label/e0s5             ONLINE       0     0     0
         label/e1s5             ONLINE       0     0     0
         label/e2s5             ONLINE       0     0     0
       raidz2-3                 ONLINE       0     0     0
         label/e0s6             ONLINE       0     0     0
         label/e1s6             ONLINE       0     0     0
         label/e2s6             ONLINE       0     0     0
         label/e0s7             ONLINE       0     0     0
         label/e1s7             ONLINE       0     0     0
         label/e2s7             ONLINE       0     0     0
       raidz2-4                 ONLINE       0     0     0
         label/e0s8             ONLINE       0     0     0
         label/e1s8             ONLINE       0     0     0
         label/e2s8             ONLINE       0     0     0
         label/e0s9             ONLINE       0     0     0
         label/e1s9             ONLINE       0     0     0
         label/e2s9             ONLINE       0     0     0
       raidz2-5                 DEGRADED     0     0     0
         label/e0s10            ONLINE       0     0     0
         label/e1s10            ONLINE       0     0     0
         label/e2s10            ONLINE       0     0     0
         label/e0s11            ONLINE       0     0     0
         spare-4                UNAVAIL      0     0     0
           9796387366129075446  UNAVAIL      0     0 0  was /dev/label/e1s11
           label/spare0         ONLINE       0     0     0
         label/e2s11            ONLINE       0     0     0
       raidz2-6                 ONLINE       0     0     0
         label/e0s12            ONLINE       0     0     0
         label/e1s12            ONLINE       0     0     0
         label/e2s12            ONLINE       0     0     0
         label/e0s13            ONLINE       0     0     0
         label/e1s13            ONLINE       0     0     0
         label/e2s13            ONLINE       0     0     0
       raidz2-7                 ONLINE       0     0     0
         label/e0s14            ONLINE       0     0     0
         label/e1s14            ONLINE       0     0     0
         label/e2s14            ONLINE       0     0     0
         label/e0s15            ONLINE       0     0     0
         label/e1s15            ONLINE       0     0     0
         label/e2s15            ONLINE       0     0     0
       raidz2-8                 ONLINE       0     0     0
         label/e0s16            ONLINE       0     0     0
         label/e1s16            ONLINE       0     0     0
         label/e2s16            ONLINE       0     0     0
         label/e0s17            ONLINE       0     0     0
         label/e1s17            ONLINE       0     0     0
         label/e2s17            ONLINE       0     0     0
     logs
       mirror-9                 ONLINE       0     0     0
         da2                    ONLINE       0     0     0
         da3                    ONLINE       0     0     0
     spares
       12553822586401141982     INUSE     was /dev/label/spare0
       label/spare1             AVAIL

errors: No known data errors

===========================================================================
STEPS DONE:

1) unplug the blinking UNAVAIL disk
2) plug the new disk in the free slot
    => the system console shows the new device name:

ugen0.4: <Avocent> at usbus0
umass0: <SCSI Transparent Interface 0> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0x4100
umass0:16:0: Attached to scbus16
da59 at umass-sim0 bus 0 scbus16 target 0 lun 0
da59: <iDRAC DRACRW 0329> Removable Direct Access SCSI device
da59: 40.000MB/s transfers
da59: 308MB (630784 512 byte sectors)
da59: quirks=0x2<NO_6_BYTE>
ugen0.4: <Avocent> at usbus0 (disconnected)
umass0: at uhub4, port 2, addr 4 (disconnected)
da59 at umass-sim0 bus 0 scbus16 target 0 lun 0
da59: <iDRAC DRACRW 0329> detached
(da59:umass-sim0:0:0:0): Periph destroyed
(da59:mrsas1:1:61:0): UNMAPPED
da59 at mrsas1 bus 1 scbus3 target 61 lun 0
da59: <SEAGATE ST91000640SS AS0B> Fixed Direct Access SPC-4 SCSI device
da59: Serial Number 9XG9RH37
da59: 150.000MB/s transfers
da59: 953869MB (1953525168 512 byte sectors)


glabel label e1s11 /dev/da59
glabel status da59
=> the disk is correctly labeled

zpool replace zpool 9796387366129075446 label/e1s11
zpool status
=> PROBLEM DESCRIBED BELOW
==========================================================================

AFTER the replace command, we can see that the second hotspare has been 
activated
as follow:

root@math12:/ # zpool status
   pool: zpool
  state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
     continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
   scan: resilver in progress since Thu Oct  4 15:39:49 2018
         214G scanned out of 12.6T at 191M/s, 18h49m to go
         7.89G resilvered, 1.66% done
config:

     NAME                           STATE     READ WRITE CKSUM
     zpool                          DEGRADED     0 0     0
       raidz2-0                     ONLINE       0 0     0
         label/e0s0                 ONLINE       0 0     0
         label/e1s0                 ONLINE       0 0     0
         label/e2s0                 ONLINE       0 0     0
         label/e0s1                 ONLINE       0 0     0
         label/e1s1                 ONLINE       0 0     0
         label/e2s1                 ONLINE       0 0     0
       raidz2-1                     ONLINE       0 0     0
         label/e0s2                 ONLINE       0 0     0
         label/e1s2                 ONLINE       0 0     0
         label/e2s2                 ONLINE       0 0     0
         label/e0s3                 ONLINE       0 0     0
         label/e1s3                 ONLINE       0 0     0
         label/e2s3                 ONLINE       0 0     0
       raidz2-2                     ONLINE       0 0     0
         label/e0s4                 ONLINE       0 0     0
         label/e1s4                 ONLINE       0 0     0
         label/e2s4                 ONLINE       0 0     0
         label/e0s5                 ONLINE       0 0     0
         label/e1s5                 ONLINE       0 0     0
         label/e2s5                 ONLINE       0 0     0
       raidz2-3                     ONLINE       0 0     0
         label/e0s6                 ONLINE       0 0     0
         label/e1s6                 ONLINE       0 0     0
         label/e2s6                 ONLINE       0 0     0
         label/e0s7                 ONLINE       0 0     0
         label/e1s7                 ONLINE       0 0     0
         label/e2s7                 ONLINE       0 0     0
       raidz2-4                     ONLINE       0 0     0
         label/e0s8                 ONLINE       0 0     0
         label/e1s8                 ONLINE       0 0     0
         label/e2s8                 ONLINE       0 0     0
         label/e0s9                 ONLINE       0 0     0
         label/e1s9                 ONLINE       0 0     0
         label/e2s9                 ONLINE       0 0     0
       raidz2-5                     DEGRADED     0 0     0
         label/e0s10                ONLINE       0 0     0
         label/e1s10                ONLINE       0 0     0
         label/e2s10                ONLINE       0 0     0
         label/e0s11                ONLINE       0 0     0
         spare-4                    UNAVAIL      0 0     0
           replacing-0              UNAVAIL      0 0     0
             spare-0                UNAVAIL      0 0     0
               9796387366129075446  UNAVAIL      0 0     0  was 
/dev/label/e1s11/old
               label/spare1         ONLINE       0 0     0  (resilvering)
             label/e1s11            ONLINE       0 0     0  (resilvering)
           label/spare0             ONLINE       0 0     0
         label/e2s11                ONLINE       0 0     0
       raidz2-6                     ONLINE       0 0     0
         label/e0s12                ONLINE       0 0     0
         label/e1s12                ONLINE       0 0     0
         label/e2s12                ONLINE       0 0     0
         label/e0s13                ONLINE       0 0     0
         label/e1s13                ONLINE       0 0     0
         label/e2s13                ONLINE       0 0     0
       raidz2-7                     ONLINE       0 0     0
         label/e0s14                ONLINE       0 0     0
         label/e1s14                ONLINE       0 0     0
         label/e2s14                ONLINE       0 0     0
         label/e0s15                ONLINE       0 0     0
         label/e1s15                ONLINE       0 0     0
         label/e2s15                ONLINE       0 0     0
       raidz2-8                     ONLINE       0 0     0
         label/e0s16                ONLINE       0 0     0
         label/e1s16                ONLINE       0 0     0
         label/e2s16                ONLINE       0 0     0
         label/e0s17                ONLINE       0 0     0
         label/e1s17                ONLINE       0 0     0
         label/e2s17                ONLINE       0 0     0
     logs
       mirror-9                     ONLINE       0 0     0
         da2                        ONLINE       0 0     0
         da3                        ONLINE       0 0     0
     spares
       12553822586401141982         INUSE     was /dev/label/spare0
       15637882846021217179         INUSE     was /dev/label/spare1

errors: No known data errors




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