JBOD across two disks, one fails

[HAL_9000]

Hello Community:

I have a ReadyNAS RN102 with two 2TByte disks configured as a single JBOD volume across both disks (Yes, I know). One is now failing with the effect that the NAS's web interface is hardly accessible. I would like to try to copy as much data as possible to a USB drive, but without the web interface being accessible, this is difficult. After a boot, it sometimes loads, sometimes it does not. When it loads and I navigate to another tab, sometimes it works, sometimes it does not. 

Does anyone have a suggestion? 

I really do not want to hear, that my configuration is risky, I knew that and I still had my reasons. And it is not a catastrophy, if the data on the NAS is lost. 

But still, if somone has an idea, let me know. 

HAL. 

[Sandshark · Accepted solution]

If you can, turn on SSH as soon as you have any GUI access.  Then, you can use the Linux command prompt to copy your files to USB.

It is a shame that Netgear has such a stern warning about SSH, as many suffer the catch 22 of not having SSH enabled when there is a potential fix, or at least work-around via SSH to their issue, had it only already been enabled.

[Sandshark · Accepted solution]

If you can, turn on SSH as soon as you have any GUI access.  Then, you can use the Linux command prompt to copy your files to USB.

It is a shame that Netgear has such a stern warning about SSH, as many suffer the catch 22 of not having SSH enabled when there is a potential fix, or at least work-around via SSH to their issue, had it only already been enabled.

[HAL_9000]

I had the same thought. I was not able to switch on SSH via the web interface, but with an app called NAS Utils on my iPhone. Now -- as a Unix novice -- I need to figure out, who to copy the data. At least I can see the disks and partitions via lsbkl now. 

[StephenB]

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@HAL_9000 wrote:

I had the same thought. I was not able to switch on SSH via the web interface, but with an app called NAS Utils on my iPhone. Now -- as a Unix novice -- I need to figure out, who to copy the data. At least I can see the disks and partitions via lsbkl now. 

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Can you first check to see how full the OS partition is?

Start by entering 

# mount --bind / /mnt
# df -h /mnt

That mounts sysroot as /mnt, and then shows you the OS partition usage.  Normally it will be 25-30% full.

If it is full, then let us know and we can give some guidance on cleaning it.

When done, you unmount with 

# umount /mnt

Note the spelling - umount, not unmount.

BTW, make sure you log in as root using the NAS admin password.

[HAL_9000]

Filesystem      Size  Used Avail Use% Mounted on

/dev/md0        4.0G  748M  3.0G  20% /mnt

[HAL_9000]

And this is how lsblk looks. 

NAME      MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda         8:0    0  1.8T  0 disk  
├─sda1      8:1    0    4G  0 part  
│ └─md0     9:0    0    4G  0 raid1 /
├─sda2      8:2    0  512M  0 part  
│ └─md1     9:1    0  511M  0 raid1 [SWAP]
└─sda3      8:3    0  1.8T  0 part  
  └─md126   9:126  0  1.8T  0 raid1 /NAS_Bak
sdb         8:16   0  1.8T  0 disk  
├─sdb1      8:17   0    4G  0 part  
│ └─md0     9:0    0    4G  0 raid1 /
├─sdb2      8:18   0  512M  0 part  
│ └─md1     9:1    0  511M  0 raid1 [SWAP]
└─sdb3      8:19   0  1.8T  0 part  
  └─md127   9:127  0  1.8T  0 raid0 
sdc         8:32   0  4.6T  0 disk  
└─sdc1      8:33   0  4.6T  0 part  /run/nfs4/media/USB_HDD_1
mtdblock0  31:0    0  1.5M  1 disk  
mtdblock1  31:1    0  512K  1 disk  
mtdblock2  31:2    0    6M  1 disk  
mtdblock3  31:3    0    4M  1 disk  
mtdblock4  31:4    0  116M  1 disk

What's next? rsync?

[StephenB]

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@HAL_9000 wrote:

What's next? rsync?

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That will work.  Or you can just use cp -r