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RN104 Extremely Slow Rebuild Time.
G'day,
I am trying to expand my RN104 and it is taking an extremely long time. It is set to X-RAID2, with 2 3TB drives. I have added a third, and it is taking an way to long to rebuild. So far it has been going for over a week (8 days actually) and it is still only 73% of the way through and says there is another 41 hours to go. My question is basically, should I just wait for it to finish?
From everything I have read, this does not seem like a typical rebuild time, so I am concerned there may be something else going on with the unit? If it is going to take this long to rebuild every time I need to replace a disk in the future, then that sort of defeats the purpose of a RAID?
A few more details,
I originally purchased the NAS, with the idea to use all the old spare Hard Disks I had accumulated in one big volume with some redundancy, for when they inevitably failed. After setting it up, and dealing with slow speeds and other instabilities, I realised the foolishness of that decision. So Is et it up, with just the 3TB WD Red, and the 3TB Seagate Barracuda I had lying around (in X-RAID2, i.e. RAID1). Big mistake, as the Barracuda drive was old, and on the way out. I got it all set up fine, but then the Seagate drive was showing increasing command timeouts, before it fell out of the array, and prompted a re-sync. Rather than wait for the resync to finish, I pulled the drive, and replaced it with another 3TB WD Red, and let it re-sync.
When that finished, and I had checked al the data was fine, I then added another drive, this time a 3TB WD GREEN. (I know it is not on the HCL, but the NAS only had 500GB free, and I had the 3TB Green lying around, so figured it would be right to chuck it in there.)
That was 8 days ago, and I am still waiting for it to finish reshaping the data. Is this normal? Can I expect it to take this long EVERTIME I try to expand the volume? Am I better of waiting for it to finish? Or backing up my data and doing a factory reset?
Is the problem the WD Green drive? Surely it can't be making the NAS take so long to expand?
I am trying to expand my RN104 and it is taking an extremely long time. It is set to X-RAID2, with 2 3TB drives. I have added a third, and it is taking an way to long to rebuild. So far it has been going for over a week (8 days actually) and it is still only 73% of the way through and says there is another 41 hours to go. My question is basically, should I just wait for it to finish?
From everything I have read, this does not seem like a typical rebuild time, so I am concerned there may be something else going on with the unit? If it is going to take this long to rebuild every time I need to replace a disk in the future, then that sort of defeats the purpose of a RAID?
A few more details,
I originally purchased the NAS, with the idea to use all the old spare Hard Disks I had accumulated in one big volume with some redundancy, for when they inevitably failed. After setting it up, and dealing with slow speeds and other instabilities, I realised the foolishness of that decision. So Is et it up, with just the 3TB WD Red, and the 3TB Seagate Barracuda I had lying around (in X-RAID2, i.e. RAID1). Big mistake, as the Barracuda drive was old, and on the way out. I got it all set up fine, but then the Seagate drive was showing increasing command timeouts, before it fell out of the array, and prompted a re-sync. Rather than wait for the resync to finish, I pulled the drive, and replaced it with another 3TB WD Red, and let it re-sync.
When that finished, and I had checked al the data was fine, I then added another drive, this time a 3TB WD GREEN. (I know it is not on the HCL, but the NAS only had 500GB free, and I had the 3TB Green lying around, so figured it would be right to chuck it in there.)
That was 8 days ago, and I am still waiting for it to finish reshaping the data. Is this normal? Can I expect it to take this long EVERTIME I try to expand the volume? Am I better of waiting for it to finish? Or backing up my data and doing a factory reset?
Is the problem the WD Green drive? Surely it can't be making the NAS take so long to expand?
13 Replies
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- WD Green drives will park the heads excessively. It's possible you may have a failing disk or high load on the NAS for other reasons.
Can you send in your logs (see the Sending Logs link in my sig)? mdgm wrote: WD Green drives will park the heads excessively.
Yeah, I know. I had a spare (almost brand new) WD Green lying around, so figured I would put it to good use. If the Green Drive dies, it dies.mdgm wrote: It's possible you may have a failing disk
I hope not, two of the drives are brand new, and the other WD Red is only about a year old. None of them are showing any errors.mdgm wrote: or high load on the NAS for other reasons.
I have been away for the past 5 days, and purposely shut down all my computers before I left, only leaving the NAS on, precisely so that I could make sure there wasn't anything accessing the NAS.mdgm wrote: Can you send in your logs (see the Sending Logs link in my sig)?
Done- Looking at your logs I'm not sure why it is taking so long.
mdgm wrote: Looking at your logs I'm not sure why it is taking so long.
Yeah, it has me baffled.
Once I've finished copying my data off, I'll do a full factory reset, and start again from scratch, and see if that makes any difference. It'll take a while (still got 14 hours of data left to copy off), but I'll see how we go.- I Think I have solved the problem.
After finally getting all my data off (that was worth the effort to keep), I powered the unit down, then went to pull the drives to rearrange them - and I was planning to start again with just the 2 WD Reds.
When I went to remove the bay containing the WD Green drive, the drive got "stuck" in the unit. As I pulled the tray out, the drive began to disengage from the tray. I had to "re-lock" the drive back into the drive tray, and then remove it carefully.
I then put the Green Drive in a different tray, rearranged the drives in the NAS, (leaving the bay the Green Drive was in free), and restarted the NAS.
At reboot, it was reporting 19.87% completed with 24hrs to go.
It has been 2 hours since, and it is now up to 25.35% with a touch over 20hrs to go.
So the problem is solved, but now I am left with working out what was wrong in the first place. I think the Green Drive was just not quite connecting properly. Leading to slow performance (due to read / write errors?)? But was the problem the tray, or the bay in the NAS? IS there an easy way to test, that isn't going to put my data at risk again?
I'm pretty sure the drive was not the problem, since it is now seems to be syncing fine. - Read/write errors should have shown up in the smart data (in addition to power cycles if that were happening). I think you are actually meaning retries on the SATA bus, but they should be tracked in SMART as well. Should being the key word I guess. I'm not sure what would happen if the drive was simply receiving out-of-spec power, but had a solid bus connection. But I can imagine poor performance with no errors if the power were marginal.
After the rebuild completes, perhaps try powering down the NAS (from the UI), and move the green drive back to the questionable slot. Then power up. If there is no performance problem, then its probably the seating issue, and not the slot itself. If it is a bad slot, you should RMA the unit, since at some point in the future you will want to use all slots. - Looks like you found a solution. One thing to try is disabling the DLNA server during re-sync. I had a similar problem when I started my 4x3TB drives on an RN104. It showed 8 days or so to finish the re-sync. I read a thread that told me to disable the DLNA server, and the last 25% took about 8 hours.
Hope that helps!
Resync is a background activity so it is much slower when there is competing access going on. Plus that other access will result in disk thrashing, which will slow things down more.mads0100 wrote: Looks like you found a solution. One thing to try is disabling the DLNA server during re-sync. I had a similar problem when I started my 4x3TB drives on an RN104. It showed 8 days or so to finish the re-sync. I read a thread that told me to disable the DLNA server, and the last 25% took about 8 hours. StephenB wrote: Read/write errors should have shown up in the smart data (in addition to power cycles if that were happening). I think you are actually meaning retries on the SATA bus, but they should be tracked in SMART as well. Should being the key word I guess. I'm not sure what would happen if the drive was simply receiving out-of-spec power, but had a solid bus connection. But I can imagine poor performance with no errors if the power were marginal.
That all sounds much more likely than what I was thinking - and actually explains what might have been happening. Thanks.StephenB wrote: After the rebuild completes, perhaps try powering down the NAS (from the UI), and move the green drive back to the questionable slot. Then power up. If there is no performance problem, then its probably the seating issue, and not the slot itself. If it is a bad slot, you should RMA the unit, since at some point in the future you will want to use all slots.
I didn't wait for the rebuild to finish, I powered down the NAS, moved the Green drive back to the questionable slot, then powered back up. On first glance, seems to be moving at the same rate, Still says about 8hrs to go. I'll keep an eye on it through the afternoon.- Looks like I have solved the problem. After moving the Green drive back to the questionable slot, the resent proceeded as normal. Unfortunately, before it could finish, we had a blackout, and so when the power cam back on, the resent started - again. (I am planning to get a UPS ASAP). Anyway, the important point is that the resync completed in about 30 - 31 hours, which seems about normal for a the RN104.
Since I have already copied most of my data off, I'm just copying the last few GBs off, and then I'll perform a factory reset. Probably not needed, but given the hassles I have had so far (including 2 firmware upgrades in the past month or so), that should get rid of any issues that have kept up (or are lingering), and perhaps just as importantly, give me the peace of mind that I should get many years of trouble free service.
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