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Can't replace faulty disk

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Can't replace faulty disk

Postby atiras » Fri May 05, 2017 4:38 pm

I have an AS-604T running ADM 2.7.1 RFT5 and BIOS 1.11

It's configured as a single RAID5 volume (4 x 3TB) using Toshiba DT01ACA300 drives (compatibility should be OK).

Recently one of the disks (disk 4) showed a red light and was reported as "missing" in the Storage Manager. Data still accessible of course, but without redundancy so needs fixing. Log showed a sequence of media errors for that disk, followed by "There is a hardware error on the slot 4 disk". (Subsequently, removing and replugging this disk showed in the log, although obviously it didn't solve the hardware error; similarly, the system reports when other disks are removed and replugged).

I bought a new Western Digital Red 3TB disk (WD30EFRX so compatibility should be fine) -- I've always had a preference for WD but the NAS originally arrived pre-populated with Toshiba disks.

Took out the defunct disk, inserted the new disk. Green light now showing on that disk, so I was expecting it to resync over a long period and then the problem was solved.

:? Well, it didn't resync. The disk still shows as 'Missing"in the Storgae Manager (other disks are "Good"). The log doesn't report that the new disk has been plugged in. And if I go to Storage Manager > Volume 1 the Management button is greyed out.

What (if anything) am I doing wrong? What else should I check? I can try the new disk in another NAS but that holds got the data-backup for the first NAS and doesn;t have any spare slots, so I'm loathe to mess around with it as a first resort.

I'll raise a support ticket with Asustor as soon as I know I'm not being a total idiot!
atiras
 
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Re: Can't replace faulty disk

Postby orion » Fri May 05, 2017 5:16 pm

I guess WD30EFRX size is slightly smaller than Toshiba DT01ACA300. So NAS will not rebuild RAID-5 volume.
If you are familiar with linux command, gdisk, you can check total sector count on each disk. (example: gdisk -l /dev/sda)

The new disk size should be equal to or larger than original disk.
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Re: Can't replace faulty disk

Postby atiras » Fri May 05, 2017 6:28 pm

I can see that might be a ossibility -- I shall have to learn how to use the linux command.

However, does that explain why the disk is not seen at all? Shouldn't I be able to see it at least, and add it as a second volume? Or is the RAID5 configuration preventing that?
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Re: Can't replace faulty disk

Postby orion » Fri May 05, 2017 6:36 pm

I believe so (management button is grayed). Your RAID-5 volume occupies 4 disks. However you should be able to see the new disk under ADM web -> Storage Manager -> Disk. There should be 4 disks (with information: model name, temperature, ...).
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Re: Can't replace faulty disk

Postby atiras » Fri May 05, 2017 7:15 pm

Only three disks shown.
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Re: Can't replace faulty disk

Postby atiras » Fri May 05, 2017 9:17 pm

It may be the new disk is DOA -- another identical WD disk is now synchroning without a problem. It's a stopgap, as the disk now in use was pulled from another Asustor because it was reporting errors, but it has helped the diagnosis...
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Re: Can't replace faulty disk

Postby atiras » Sun May 07, 2017 4:06 pm

Yeah, the original replacement disk was faulty. New disk went in without any problem and has finished synching.
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