RN314 Capacity upgrade failure (Message "unfreeze_partials.isra.75+4d")

Dear Community,

RN314 running OS 6.6

Had 4*2TB drives moving to 4*6TB drives on HCL.

First three drives upgraded successfully, will include my notes below.

Fourth drive appears to have completed the rebuild phase (drive number flashing... messgae says Degraded->Redundant .. drive number no longer flashing) but did not indicate the second Resync (to vertical expand?)

On returning to the site I note "unfreeze_partials.isra.75+4d" on the device display.

Initial attempts to view the admin gui page were successful and the Overview status indicated "Healthy"

The volumes tab only showd the "busy spinner".

SSH works: top, ls, ps, cd commands work... can view log files

however disk status commands like df and btrfs hang.

Other devices on the hetwork can access the shares.

After some short time, reinvoking the admin page shows only the splash screen, timeout, then try to load the "admin" page.  Get "ReadyNAS Admion Page is offline."

I am looking for guidance.  I hesitate just to reboot hoping someone more experienced might be able to further information gathering.

My notes and log excerpts follow:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

Dec 19 2016
Upgrading disks
Started with
Data 3.47TB
Snapshots 231.45Gb
Free 1.74Tb
Type: RAID5

Removed Drive4: (right hand unit) was Toshiba DT01ACA200 2.0TB SN Z31UNVEKS TZ5
WD Red wd6002FFWX 6.0TB SN K1GPNP0D
Log Excerpt
Mon Dec 19 2016 20:40:42 Volume: Volume data health changed from Degraded to Redundant.
Mon Dec 19 2016 20:40:42 Volume: Volume data is resynced.
Mon Dec 19 2016 15:36:00 Volume: Resyncing started for Volume data.
Mon Dec 19 2016 15:35:44 Disk: Disk Model:WDC WD6002FFWX-68TZ4N0 Serial:K1GPNP0D was added to Channel 4 of the head unit.
Mon Dec 19 2016 15:22:06 Volume: Volume data health changed from Redundant to Degraded.
Mon Dec 19 2016 15:21:46 Disk: Disk Model:TOSHIBA DT01ACA200 Serial:Z31UNVEKS was removed from Channel 4 of the head unit.

Same size info
Removed drive3 (right middle unit) was Toshiba DT01ACA200 2.0TB SN Y36UW8MGS
WD Red WD6002FFWX 6.0TB SN K1GSYNYWD

Tue Dec 20 2016 2:44:43 Volume: Resyncing started for Volume data.
Tue Dec 20 2016 2:44:32 Volume: Volume data health changed from Degraded to Redundant.
Tue Dec 20 2016 2:44:32 Volume: Volume data is resynced.
Tue Dec 20 2016 1:00:05 Volume: Volume data is Degraded.
Tue Dec 20 2016 0:48:43 Snapshot: Snapshot prune worker successfully deleted snapshot 2016_11_22__00_00_17 from share or LUN Videos.
...
Tue Dec 20 2016 0:00:32 Miscellaneous: Snapshot c_1482210028 was successfully created for share or LUN Videos.
...
Mon Dec 19 2016 21:45:52 Volume: Resyncing started for Volume data.
Mon Dec 19 2016 21:45:28 Disk: Disk Model:WDC WD6002FFWX-68TZ4N0 Serial:K1GSNYWD was added to Channel 3 of the head unit.
Mon Dec 19 2016 21:41:05 Volume: Volume data health changed from Redundant to Degraded.
Mon Dec 19 2016 21:41:02 Disk: Disk Model:TOSHIBA DT01ACA200 Serial:Y3SUW8MGS was removed from Channel 3 of the head unit.

I do NOT understand the 2:44:43 Resync starting.
Also capacity figures are:
Data 3.47Tb
Snapshots 231.45 Gb
Free 5.38Tb
At 08:10 all four green lights are on solid for the four drives.
Overview page shows "Healthy, resyncing"
I didn't think I would get more free space until all four drives were replaced.
Time will tell.
The data icon on the overview page says 5.38Tb of 9.08 Tb
Status window on the Volumes tab of System page says:
Resyncing in progress 85.12% complete
Remaining time 1:50:06

I returned to find the sync was complete

Log:
Tue Dec 20 2016 10:24:55 Volume: Volume data is resynced.

Removed drive 2 (left middle unit) was Toshiba DT01ACA200 SN Y3OT4SGS
WE Red WD6002FFWX K1GV6LD8

Wed Dec 21 2016 12:30:46 Volume: Volume data is resynced.
Tue Dec 20 2016 17:07:37 Volume: Resyncing started for Volume data.
Tue Dec 20 2016 17:06:51 Volume: Volume data health changed from Degraded to Redundant.
Tue Dec 20 2016 17:06:50 Volume: Volume data is resynced.
Tue Dec 20 2016 13:36:23 System: Antivirus scanner definition file was updated to 201612201741.
Tue Dec 20 2016 12:03:21 Volume: Resyncing started for Volume data.
Tue Dec 20 2016 12:03:02 Disk: Disk Model:WDC WD6002FFWX-68TZ4N0 Serial:K1GV6LDB was added to Channel 2 of the head unit.
Tue Dec 20 2016 12:00:08 Volume: Volume data health changed from Redundant to Degraded.
Tue Dec 20 2016 11:59:50 isk: Disk Model:TOSHIBA DT01ACA200 Serial:Y3OT4XSGS was removed from Channel 2 of the head unit.

Once again as with the second drive replacement, after the first sync is done, and the array moves from Degraded back to Redundant, a second sync takes place (to make the new extra space usable??)

After the second resync the capacity sizes are:
Data 3.47Tb
Snapshots 231.45Gb
Free 9.02Tb

Removed drive 1 (right unit) was Toshiba DT01ACA200 SN Y30SWMSGS
WD Red WD6002RRWX SN K1GT6BGD
Wed Dec 21 2016 19:04:57 Volume: Volume data health changed from Degraded to Redundant.
Wed Dec 21 2016 19:04:57 Volume: Volume data is resynced.
Wed Dec 21 2016 14:11:54 Volume: Resyncing started for Volume data.
Wed Dec 21 2016 14:11:34 Disk: Disk Model:WDC WD6002FFWX-68TZ4N0 Serial:K1GT6BGD was added to Channel 1 of the head unit.
Wed Dec 21 2016 14:09:32 Volume: Volume data health changed from Redundant to Degraded.
Wed Dec 21 2016 14:09:26 Disk: Disk Model:TOSHIBA DT01ACA200 Serial:Y3OSWMSGS was removed from Channel 1 of the head unit.

Returned to find log message showing change from Degraded to Redundant.
But no second resync started.
Machine display shows "unfreeze partials.isra.74+4d"
All four disk device lights on solid.
Overview shows Status: Healthy
Volumes tab: just shows wait spinner
Performance tab shows believable numbers for all catagories except utilization which is blank.

As I tried more things the admin page access only shows the splash screen.
SSH access still works, and other devices can still see the shares.

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Thanks.