Is my boot pool mirror OK?

[danb35]

I didn't see that this question really fit any of the sub-forums here, so here it goes. I installed 9.3-RELEASE to two mirrored 8-GB USB sticks a week or two ago. A few days ago, I ran a scrub of the boot pool, which showed lots of errors on one of the devices and eventually kicked it out of the pool. I got a new USB stick and installed it today, replacing the old stick through the web GUI. A couple of things seemed odd to me in the process, though. First, the resilver took two hours. This seems really slow; I'd expect it should have taken on the order of single-digit minutes. Second, the following showed in the log during the process:

Code:

Jan  3 14:19:18 freenas2 ugen1.4: <PNY Technologies> at usbus1
Jan  3 14:19:18 freenas2 umass1: <PNY Technologies USB 2.0 FD, class 0/0, rev 2.00/11.00, addr 4> on usbus1
Jan  3 14:19:18 freenas2 umass1:  SCSI over Bulk-Only; quirks = 0x0100
Jan  3 14:19:18 freenas2 umass1:9:1:-1: Attached to scbus9
Jan  3 14:19:18 freenas2 da9 at umass-sim1 bus 1 scbus9 target 0 lun 0
Jan  3 14:19:18 freenas2 da9: <PNY USB 2.0 FD 1100> Removable Direct Access SCSI-4 device 
Jan  3 14:19:18 freenas2 da9: Serial Number AE91H04YE120002109
Jan  3 14:19:18 freenas2 da9: 40.000MB/s transfers
Jan  3 14:19:18 freenas2 da9: 15600MB (31950720 512 byte sectors: 255H 63S/T 1988C)
Jan  3 14:19:18 freenas2 da9: quirks=0x2<NO_6_BYTE>
Jan  3 14:19:37 freenas2 notifier: 1+0 records in
Jan  3 14:19:37 freenas2 notifier: 1+0 records out
Jan  3 14:19:37 freenas2 notifier: 1048576 bytes transferred in 0.072384 secs (14486271 bytes/sec)
Jan  3 14:19:37 freenas2 notifier: dd: /dev/da9: short write on character device
Jan  3 14:19:37 freenas2 notifier: dd: /dev/da9: end of device
Jan  3 14:19:37 freenas2 notifier: 5+0 records in
Jan  3 14:19:37 freenas2 notifier: 4+1 records out
Jan  3 14:19:37 freenas2 notifier: 5177344 bytes transferred in 0.209109 secs (24759060 bytes/sec)
Jan  3 14:20:28 freenas2 notifier: Installing for i386-pc platform.
Jan  3 14:24:14 freenas2 notifier: /usr/local/sbin/grub-install: error: unknown filesystem.

The pool status, however, shows just fine:

Code:

[root@freenas2] ~# zpool status
  pool: freenas-boot
 state: ONLINE
  scan: scrub repaired 0 in 0h6m with 0 errors on Sat Jan  3 16:41:43 2015
config:

    NAME                                            STATE     READ WRITE CKSUM
    freenas-boot                                    ONLINE       0     0     0
     mirror-0                                      ONLINE       0     0     0
       da9p2                                       ONLINE       0     0     0
       gptid/40f57662-894c-11e4-b767-0cc47a01304d  ONLINE       0     0     0

errors: No known data errors

No warnings are shown in the web GUI, either. Is my boot mirror OK, or does it need fixing?

 

[danb35]

Any ideas on this? Everything seems to be working OK, so I'm not too worried, but the extremely slow resilver and the grub-install error didn't seem right.