Rebuild taking forever.

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  • Last Post 1 weeks ago
Darren Teasdale posted this 3 weeks ago

I have an 18tb Pegasus 2 R8 and one of the drives died. I replaced it and hit rebuild. 48hrs later it was at 2%. Left it another 5 days and it never moved past 2%

I checked Events and it says the drives are Idle as well as saying the Power Saving mode of the Physical Drive is changed to STOPPED. It says this for both my replacement drive and the spare drive PD 6 and PD 7 in my system.

I searched further and I now have an error of PD 4 for a bad sector that was registered straight after I replaced the dead physical drive.

I paused and then restarted the rebuild and it now says 0% - Running

Is there a way to force the rebuild or have I lost everything?

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R P posted this 2 weeks ago

Hi Darren,

I have an 18tb Pegasus 2 R8 and one of the drives died. I replaced it and hit rebuild. 48hrs later it was at 2%. Left it another 5 days and it never moved past 2%

If I had to guess, and I do have to guess here, chances are that another disk is going bad and that's why the rebuild is hanging.

But it would be better if we had some data.

Could you use the Promise Utility to generate a service report, zip it, then attach it to your comment? 

Darren Teasdale posted this 2 weeks ago

Thank you for the reply.

What is the best way to generate a report? I tried the Save Report option from the Subsystem Information tab but it just says please wait and then nothing happens.

Looking through admin options it shows all physical drives as OK and green tick.

It says the Disk Array is Degraded with Yellow Exlamation

It also says the Logical Drive is Critical, Degraded, Rebuilding with Yellow Exclamation

The front of the drive shows all blue lights for each bay and the lower light for PD 4 (which has a bad sector) is flashing to show activity

When I look at the Physical drive list it shows all drives a s working and OK with green ticks.

From what I have found online, the rebuild is hanging because of the bad sector on PD 4. I'm hoping the drive is being remapped to avoid the sector so that the redbuild can still take place. I saw an article that said this remapping can takes days to weeks to perform.

 

R P posted this 2 weeks ago

Hi Darren,

What is the best way to generate a report? I tried the Save Report option from the Subsystem Information tab but it just says please wait and then nothing happens.

Most likely you are using a very old version of the Promise Utility, they do not work properly on the modern macOS.

Please use this version of the Promise Utility.

From what I have found online, the rebuild is hanging because of the bad sector on PD 4. I'm hoping the drive is being remapped to avoid the sector so that the redbuild can still take place. I saw an article that said this remapping can takes days to weeks to perform.

I'm not sure what you were reading, but if a drive hits a sector it cannot read it does read retries and at some point tries to reconstruct the sector using ECC, at which point it remaps that sector to a reserved block and marks that block as bad. If there is a bad area on the disk platter and thousand of bad blocks then this can take a very long time. Also, I'm told that modern disks have about 1000 reserved sectors, if there are more bad blocks than reserved sectors this is a problem. The SMART data will help sort this out.

Darren Teasdale posted this 2 weeks ago

Thanks again for helping.

I do have the latest version of the utility. I have left the device to run for the last 3 days and the progress bar is still at 0% In the Physical Drive list all drives except the replacment drive show as Ok. The replacement drive shows as Yello Exclamation and says Rebuidling.

Front led lights for all drives are solid blue and replacment drive is flashing orange indicating activity, The Disk Array is showing as OK and the Logical Drive shows as rebuilding.

I followed some advice on the forum to pause the rebuild and resume it but it won't let me pause citing another rebuild request coomand is pending.

The drive in slot 4 apparently has a bad sector according to the event log but still shows as Ok in Physical Drive list. There is also a Command Time out on disk 4 in the Events tab. This comes just after it says bad sector. I think maybe the drive is failing to bypass the bad sector and locks up.

All drives were running perfectly until drive 6 died. I replaced it and now can't rebuild because of the above issues. All drives are WD3tb and there's 6 in total plus 1 spare. I have it set to Raid10 because it was supposed to be able to handle 2 drives failing but I am beginnong to think that's not true since I had one drive fail and then suddenly a bad sector on another drive and the whole system has gone down.

As I am typing this I suddenly got a pop-up saying the disk i attached is not readable by this computer and the 3 options to eject, ignore or initialise. I chose ignore and I can now see the Promise Drive in Disk Utility. I can't access the drives or data though.

I am not sure what else to do. Should I leave it running or try something else? What is an acceptable amount of time to leave this 'rebuilding' bwith zero sign of progress?

I appreciate any info or answers.

R P posted this 2 weeks ago

Hi Darren,

> I do have the latest version of the utility.

Then which macOS version are you using? And is it Intel macOS or Apple Silicon macOS?

And the link I gave was not to the latest Promise Utility, it was to an older version which is fully compatible with the Pegasus 1 and Pegasus 2.

We will need a service report to proceed further, so you need to get a version of the Promise Utiity compatible with whatever version of macOS you are using.

 

Darren Teasdale posted this 1 weeks ago

Hello

 

I am using a imac Retina 5K 2017 with 32gb ram and operating on Ventura 13.7.8. I also have a macbook air M1 if you think I should try on that. I updated the Promise software via the app update function and it is the latest version.

Should I try the older app version to see if there's a difference?

 

Appreciate the help.

R P posted this 1 weeks ago

Hi Darren,

I am using a imac Retina 5K 2017 with 32gb ram and operating on Ventura 13.7.8.

I also have a macbook air M1

This should work for either.

If you are having issues please fully uninstall the old Promise Utility first. Open Finder in the Applications folder and drag the Promise Utility into the trash, you will have to be sure it is not running and you will need to enter your password. Then install the Promise Utility linked to above.

 

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