Mac hard resets when mounting external HD

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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Wed Oct 10, 2012 2:11 am

Yeah... it's not working... the external drive is not even spinning...
see screen shot below:

The name of the drive was My Book
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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Wed Oct 10, 2012 2:14 am

I tried it once more (the zpool command)... and this time it did this really quickly (after a second or so)

I'm not sure if this is what you expected to see:
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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Wed Oct 10, 2012 2:18 am

But then again i did that diskutil list command... and I think USB controller got disabled again?? I plugged in my mouse into the other USB port and it's not working.

the drive is not listed

see screenshot...
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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Wed Oct 10, 2012 2:20 am

I unplugged and replugged in the external drive... ran the diskutil list command to make sure the Mac recognizes it.... then ran the sudo ZPOOL import command...

and it's stuck again with no progress.
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Re: Mac hard resets when mounting external HD

Post by grahamperrin » Wed Oct 10, 2012 2:24 am

collegeitdept wrote:… Only after I unplugged it and plugged it back in is it recognized by …


… external drive is not even spinning …


Another one line command that might help in this case:

Code: Select all
sudo pmset disksleep 0


It may not help at startup time etc., but … if there's a problem with spin up times for the disk, then the command above will prevent disks from sleeping (will prevent rotational disks from spinning down …). To that one-line command, expect to see a response something like this:

macbookpro08-centrim:bin gjp22$ sudo pmset disksleep 0
Password:
Warning: Idle sleep timings for "Battery Power" may not behave as expected.
- Disk sleep should be non-zero whenever system sleep is non-zero.
macbookpro08-centrim:bin gjp22$


(That warning is acceptable for now. Nothing to worry about. Make a mental note and written note to change things in the Energy Saver pane of System Preferences at a later date (after this topic reaches its conclusion).)

Disconnect the drive, run the one-line command above, restart the computer, reconnect the drive then when you're certain that the drive (but not its volume) is recognisable to the MacBook Pro: run

Code: Select all
sudo zpool import -d /dev -o readonly=on -N "My Book"


– this assumes that My Book was the name that you entered a few weeks or months ago when you used ZEVO Setup Assistant.
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Re: Mac hard resets when mounting external HD

Post by grahamperrin » Wed Oct 10, 2012 2:29 am

To Don or another expert (I'm not the expert): should we also

sudo mv /System/Library/Extensions/ZFSDriver.kext /var/tmp/

– or was that particular technical advice to avoid panic in the Community Edition 1.1.1 situation?

(Here we have Silver Edition 1.0.3, only temporarily, to avoid kernel panic for a less technical user.)
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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Wed Oct 10, 2012 8:51 am

It didn't work.

Nothing happened.

Please say there's a way to get my data back...please? I thought ZFS was support to protect against data errors etc... and was rock solid?

My use case is not out of the ordinary from an advanced home user.
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Re: Mac hard resets when mounting external HD

Post by collegeitdept » Thu Oct 11, 2012 12:28 am

Are there any other suggestions to get my data back please?
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cross reference

Post by grahamperrin » Thu Oct 11, 2012 1:56 pm

Whilst OS X alone can not report the S.M.A.R.T. status of an external USB drive such as your Western Digital, I guess that its status may become visible if you install a suitable driver. Please see:

OS X SAT SMART Driver
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Re: cross reference

Post by collegeitdept » Fri Oct 19, 2012 12:12 am

grahamperrin wrote:Whilst OS X alone can not report the S.M.A.R.T. status of an external USB drive such as your Western Digital, I guess that its status may become visible if you install a suitable driver. Please see:

OS X SAT SMART Driver





After installing OS X SMART Driver and opening Disk Utility... Here's what it shows:
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Screen Shot 2012-10-18 at 10.10.42 PM.png
Disk Utility - SMART Driver
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