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ReadyNAS NV+ disc replacement failure using identical disk type
My ReadyNAS NV+ is equipped with 4 identical 2 TB drives. Seagate Model ST2000DM001. I am running XRAID. Was receiving notices of increasing bad sectors, in increasing numbers on Drive 4. Purchased a...
GeorgeYYZ wrote:
The Ultra 4 is currently running under X-RAID2. I assume that this is equivalent to X-RAID...
Yes. On the Sparc NAS (NV+, etc) they called it X-RAID, then with Ultra/Pro they rebranded it to X-RAID2. With OS-6 they went back to XRAID.
In all cases it is "expandible raid", the details on expansion vary, depending on which platform you have.
GeorgeYYZ wrote:
but I will revise my upgrade plans to 4x4TB, since that is a suitable match for my Synology DS918+ .
It'd be sensible to match their capacities. You can then use one to back up the other (I use my older-but still working ReadyNAS as backups).
I realize it's been almost 5 months since I last responded to your suggestion that I replace the failed (brand new) WD20EFRX 2 TB disk that I had previously purchased with a new one for my 4-disk ReadyNAS NV+ . I followed up on your advice immediately with the seller, and they replaced the failed drive within a few days at no expense whatsoever.
In the meantime, I had copied all its critical files to my ReadyNAS Ultra 4 (also a 4-disk model), which uses the Seagate ST3000DM001 3 TB drives that you warned me about. Sure enough, one of them failed almost immediately after copying the files from my NV+ so that now I had TWO non-redundant ReadyNAS servers!
Given the severity of your warning, and the higher capacity of the newer NAS, I expedited the replacement of the 3 TB Seagate drive with a newer model (ST3000DM008), which survived the sync process without complaint. My intention now is to go about replacing all of those drives, one by one, and I am hoping you can confirm that the ST3000DM008 is a better, more durable 3 TB drive than its predecessor, or recommend a superior 3 TB drive, (WD30EFRX ?) since 12 TB is the upper limit of the Ultra 4.
As for my NV+, although I had acquired a new 2 TB drive fairly quickly, I had already been through two very lengthy (5-days each) unsuccessful attempts at resyncing and didn't want to postpone migration of critical files until after a third (possibly failed, possibly very lengthy, and, should a second drive fail, possibly disastrous resyncing attempt.
But then, since the Ultra 4 was newly redundant and all the files had been copied from the NV+, I procrastinated and didn't attempt resyncing the NV+ until last night.
The good news is that is came off without a hitch, starting from a "Power Off" condition, and I am now planning to replace all the 2 TB drives in the NV+ with WD20EFRX drives.
I am planning to do the same for my Ultra 4, but not until I've got your recommendations for a solid-performing 3 TB drive. (My suspicion is that you'll recommend the WD30EFRX :)
As a postscript, I should mention that while all of this was going on, I went out and purchased yet another NAS - a Synology DS916+ - which I have populated with WD40EFRX drives!
Lastly, I want to thank you very much for your help and advice in getting my NV+ back to its original status, and I invite you to make any additional suggestions regarding backup processes, drive replacements, or any other issues that I might overlook in the future. You have been an immense help, and I appreciate your input very much!
I'm glad you are back up again.
GeorgeYYZ wrote:
I am hoping you can confirm that the ST3000DM008 is a better, more durable 3 TB drive than its predecessor, or recommend a superior 3 TB drive, (WD30EFRX ?) since 12 TB is the upper limit of the Ultra 4.
Generally I recommend either enterprise-class drives or NAS-purposed drives (WDC Red or Seagate IronWolf). I don't know how the DM008 compares with the older models, hopefully Seagate has improved the reliability in RAID arrays along the way.
On sizes, the total XRAID volume size can't exceed 16 TiB on an Ultra 4. You can use up to 4x5TB drives without hitting that limit. Or deploy 3x8 TB with one slot empty. You aren't limited to 3 TB drives.
Although Netgear doesn't support it, you can convert the ultra 4 to run OS-6 which has no known expansion limits (allowing you to use 4x12TB for instance).
Thanks, once again, for the information regarding the Ultra 4. I don't remember how I arrived at the upper limit of 4x3TB drives (maybe it was my budget?), but I will revise my upgrade plans to 4x4TB, since that is a suitable match for my Synology DS918+ . The Ultra 4 is currently running under X-RAID2. I assume that this is equivalent to X-RAID in terms of the storage limit?
GeorgeYYZ wrote:
The Ultra 4 is currently running under X-RAID2. I assume that this is equivalent to X-RAID...
Yes. On the Sparc NAS (NV+, etc) they called it X-RAID, then with Ultra/Pro they rebranded it to X-RAID2. With OS-6 they went back to XRAID.
In all cases it is "expandible raid", the details on expansion vary, depending on which platform you have.
GeorgeYYZ wrote:
but I will revise my upgrade plans to 4x4TB, since that is a suitable match for my Synology DS918+ .
It'd be sensible to match their capacities. You can then use one to back up the other (I use my older-but still working ReadyNAS as backups).
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