Duo v1 hangs during sync and losses network

Question

Hi,&nbsp;I have a ReadyNas Duo v1 with two 2 TB disks &nbsp;in RAID configuration (don't remember which), The 2TB disk space is almost full, ~95%.Maximum memory.&nbsp;I also have a UPS connected to the NAS. Mostly video and music files.The NAS has the latest RAIDiator release and has been working fine for several years. Disk upgrade some years ago.&nbsp;Problem description:&nbsp;I suddenly noticed that I didn't have access to the NAS anymore using web interface, nor ping responding to pings.Both disk LEDs are green. The activity LED blinks now and then (10 -15 s between blinks). Power button LED is blue.I have ssh activated.&nbsp;I can't turn off the NAS using the power button, non responsive to short or long pressing.Obviously I can't log in with ssh, due to no network connection.&nbsp;I pulled the power cord and waited a while and then turned it on agin.The NAS start syncing the disks. I can see that this happens in RAIDar.I can ping it during the sync and log in with ssh.&nbsp;When the sync has reached about 77% it loses network connection and becomes non responsive agin, as above.&nbsp;I have mounted the disks on Windows PC and backed up what could be read out from disk 1, disk 2 seems not to have any paritions.Most file on disk 1 seems to ok. Some directories that should contain file are empy, some has a file(name) but I can't recover a file.&nbsp;Questions:&nbsp;Q1: Any idea why sync stops and NAS gets unresponsive?Q2: How can I determince which RAID type I am usnig by looking at some file when logging in with SSH?Q3: Any specific log file I should &nbsp;look in (filename and path plese)?Q4: Should disk 2 be without any parition, seem strange to me (parity disk?)?Q5. Any idea how to recover files?Q6; Should I have frontview access during sync?&nbsp;&nbsp;Thanks in advance!&nbsp;&nbsp;

StephenB · Answer

Monteverde wrote:
&nbsp;
&nbsp;
Will try to backup to external disks from NAS during later tonight.

Great. &nbsp;That simplifies the next steps (and you should have all your data).
&nbsp;
The fastest way to back up your data is to attach the external disk to your PC and back up over a wired ethernet network. &nbsp;That is a lot faster than attaching the USB drives directly to the NAS. &nbsp;I like to use robocopy or teracopy, and not windows drag and drop. &nbsp;Teracopy has a verify option, which is probably worth using (though it will take longer). &nbsp;
&nbsp;
Once that is done, install the replacement disk for disk 1. &nbsp;I like to test it with vendor diags in a PC first. Don't format it- &nbsp;just hot-insert it into the NAS unformatted.&nbsp; Keep in mind that your duo has a size limit of 2 TB or less. &nbsp;I recommend WDC Red drives (wd20efrx or wd10efrx). &nbsp;If you prefer seagate, use a drive from their VN line (not a DM drive). &nbsp;
&nbsp;
The compatibility list for the duo is stale, &nbsp;so it isn't very useful anymore.
&nbsp;
Obviously one lesson here is that RAID isn't enough to keep your data safe, so you should set yourself a regular backup schedule once everything is running again.

StephenB · Answer

Disk 2 has an OS partition but no data partition. &nbsp;Data is mirrored there none the less.
&nbsp;
It sounds like you must have RAID-1, but that could be either xraid or flexraid. &nbsp;What tool did you use to extract the data on the PC? &nbsp;With xraid, I suggest linux reader (&nbsp;http://www.diskinternals.com/linux-reader/ )
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When you can access via ssh, did you check OS partition fullness?
df . -h
df . -i
&nbsp;
Note you can also remove disk 2 and boot the NAS w/o it. &nbsp;Then it can't sync. &nbsp;It might still lock up.
&nbsp;
Be careful not to insert a disk with the NAS running right now though - it will format it, and that is not what you want.

Monteverde · Answer

Hi,&nbsp;Yes, I used the linux-reader tool from diskinternals.com as recommmend in other threads in this forum.I definitly think I use&nbsp;X-RAID and not Flex-RAID.&nbsp;&nbsp;Removed disk2 when nas was down and start up. Logged in with ssh and checked the proposed commands, see below:&nbsp;&nbsp;Filesystem            Size  Used Avail Use% Mounted on
/dev/hdc1             1.9G  608M  1.3G  31% /
nas-76-26-27:/# df . -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/hdc1             128000   12157  115843   10% /&nbsp;&nbsp;Should I have had disk2 inserted?&nbsp;I only find the following log files updated in the system, see below. Shouldn't other logfiles have updates?&nbsp;nas-76-26-27:/# cat /var/log/frontview/memory.log
SZ: 1024
AT: 2.5-3-3-7
ID: 7f98000000000000
PN: 4b0000000000000000000000000000000000
RV: 0000
DT: 0921
SN: a1147869

nas-76-26-27:/# cat /var/log/frontview/enclosure.log
fan!!1!!status=ok::descr=1744RPM
ups!!1!!status=fail::descr=APC Back-UPS CS 350 Battery charge: 100%, 77 min
volume!!1!!status=ok::descr=Volume C: RAID Level X, Redundant; 1751 GB (94%) of 1853 GB used
disk!!1!!status=ok::descr=Channel 1: SAMSUNG HD204UI 1863 GB, 34C/93F
disk!!2!!status=ok::descr=Channel 2: SAMSUNG HD204UI 1863 GB, 31C/87F
model!!0!!mode=home::descr=ReadyNAS Duo::arch=nsp
Boot!!FS_CHECK!! 53%
nas-76-26-27:/# cat /tmp/fsck.log
***** File system check performed at Fri Jan 29 23:57:15 CET 2016 *****
fsck 1.40.11 (17-June-2008)
e2fsck 1.40.11 (17-June-2008)
c was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes&nbsp;It locked again at ~70% into the file checking&nbsp;I ran the &nbsp;top command just to see if there were any resources were low, but I don't think it looks strange&nbsp;&nbsp;Any ideas?

StephenB · Answer

Your OS partition is fine. You must be using xraid, because linux reader wouldn't see the files if you were using flexraid.
&nbsp;
I think you have a corrupt file system (and that the lockup is in fsck, not raid resync). &nbsp;Though I can't rule out a failing disk.
&nbsp;
You could shut down, and insert disk 2 alone (in the second slot) and see if you get the same behavior. &nbsp;My guess is that you will, but it is worth a try.
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It is also worth testing the disks with vendor diags in a PC (seatools for seagate, lifeguard for western digital).
&nbsp;
Assuming the lockup happens with only disk 2 installed, the options are to&nbsp;
(a) attempt to repair the file system yourself
(b) contract with Netgear for data recovery
(c) accept the data loss - do a factory reset on the NAS, reconfigure it, and restore the data from a backup.
&nbsp;
No matter what option you pick, create a backup on your PC first - &nbsp;using linux reader (copying the files linux reader sees to a USB disk or an NTFS internal disk).

Monteverde · Answer

Tried to boot up with only&nbsp;disk 2 plugged in.&nbsp;The system came up after finishing the file checks, i.e. no hanging during fsck phase as with both disks or only disk 1 in.So problem seems to be related to disk 1.&nbsp;FrontView access, shares etc came up.&nbsp;Did a controlled shutdown since I have to go away for a while.&nbsp;&nbsp;Will try to backup to external disks from NAS during later tonight.

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Duo v1 hangs during sync and losses network

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