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Forum Discussion
ReadyNAS Ultra 6 hot swap resync error
Hello,
I am running a ReadyNAS Ultra 6 with RAIDiator 4.2.31. I have been running with all 6 disk bays full for years, and I had started to approach the capacity of the RAID array (91%). I had a new-ish spare 3TB WD Red hard drive kicking around, so I decided to hot swap it in place of an old 2TB WD Green hard drive in bay 6. When I did so, the NAS begin to restripe but quit after reporting that the HDD in Bay 1 was dead. I found this suspicious, because HDD 1 had been operating fine until I removed HDD 6. Anyway, I'm pretty sure that I next tried removing and re-installing HDD 6 a second time, and I received the same error. Then I tried installing the original 2TB HDD back into Bay 6, but I received an error saying that the "Disk attempted to add is too small." So I purchased a new 4TB drive and installed it in Bay 6 tonight, but I again received an error after some amount of resyncing saying that HDD1 was dead.
Here is the full log: (Note that the last resync failure with the 4TB drive in Bay 6 should be listed at the top but isn't)
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Thu Oct 12 23:46:10 PDT 2017 System is up.
Thu Oct 12 19:54:53 PDT 2017 RAID sync started on volume C.
Thu Oct 12 19:53:50 PDT 2017 Data volume will be rebuilt with disk 6.
Thu Oct 12 19:51:40 PDT 2017 New disk detected. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time. [Disk 6]
Thu Oct 12 19:49:08 PDT 2017 A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Thu Oct 12 19:49:08 PDT 2017 Disk removal detected. [Disk 6]
Thu Oct 12 10:09:38 PDT 2017 Disk attempted to add is too small. Please check the size of disk 6.
Thu Oct 12 09:18:47 PDT 2017 System is up.
Thu Oct 12 08:31:48 PDT 2017 If the failed disk is used in a RAID level 1, 5, or X-RAID volume, please note that volume is now unprotected, and an additional disk failure may render that volume dead. If this disk is a part of a RAID 6 volume, your volume is still protected if this is your first failure. A 2nd disk failure will make your volume unprotected. If this disk is a part of a RAID 10 volume, a failure of this disk's mirror partner will render the volume dead. It is recommended that you replace the failed disk as soon as possible to maintain optimal protection of your volume.
Thu Oct 12 08:31:47 PDT 2017 Disk failure detected.
Thu Oct 12 00:56:16 PDT 2017 RAID sync finished on volume C. The array is still in degraded mode, however. This can be caused by a disk sync failure or failed disks in a multi-parity disk array.
Thu Oct 12 00:53:11 PDT 2017 System is up.
Thu Oct 12 00:50:19 PDT 2017 Please close this browser session and use RAIDar to reconnect to the device. System rebooting...
Thu Oct 12 00:43:50 PDT 2017 RAID sync finished on volume C. The array is still in degraded mode, however. This can be caused by a disk sync failure or failed disks in a multi-parity disk array.
Thu Oct 12 00:39:47 PDT 2017 RAID sync started on volume C.
Thu Oct 12 00:39:24 PDT 2017 Data volume will be rebuilt with disk 6.
Thu Oct 12 00:37:13 PDT 2017 New disk detected. If multiple disks have been added, they will be processed one at a time. Please do not remove any added disk(s) during this time. [Disk 6]
Thu Oct 12 00:34:33 PDT 2017 A disk was removed from the ReadyNAS. One or more RAID volumes are currently unprotected, and an additional disk failure or removal may result in data loss. Please add a replacement disk as soon as possible.
Thu Oct 12 00:34:33 PDT 2017 Disk removal detected. [Disk 6]
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What's strange is that HDD1 seems to perform fine when I restart and there is no drive in HDD6. However, I do see that HDD1 has a non-zero Raw Read Error Rate (30) and a non-zero Current Pending Sector, whereas all of my other drives report zero for both. I don't know what to do, because in my current configuration I'm not redundant. But if I try to replace HDD1 without HDD6 present, won't I lose everything? I'm attaching a screenshot of my Status>Health page. Any advice is greatly appreciated!
6 Replies
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I'd love to hear any suggestions before I swap out HDD 1 and likely lose the entire data array. Many thanks for sharing any thoughts.
Is HDD1 also a green drive? I have seen drives declared "dead" in OS4.2.x because they failed to spin up as fast as the rest. If HDD1 is now the only green drive, that could be the issue. There certainly does seem to be a big risk of losing the array if you swap out HDD1, but I don't think you have a lot of options. You could try cloning HDD1 to another drive, but there is still some risk there. Just make sure your backup is up to date and hope you don't have to take the time to reestore it.
Thank you for the reply, Sandshark! Strangely, HDD1 is actually a 4TB WD Red drive that I installed within the last year. Bad luck on this early failure while hot swapping another drive, I suppose.
Sadly, I think that you are correct that I don't have many options here. I'll look into cloning HDD1; thanks for the advice. Luckily, I do have a current backup of all data. I'm just not looking forward to spending many days (weeks?) restoring everything.
Cheers,
S
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