Re: USB external hard drive disconnecting

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2008/2/15 Mikkel L. Ellertson <mikkel@xxxxxxxxxxxxxxxx>:
>  How hot is "pretty hot"? Is it possible that the drive electronics
>  are overheating? You might need a better external case.

Hi Mikkel.  I may have exaggerated a bit.  I wouldn't guess that it's
hot enough to cause problems; more like noticeably very warm to the
touch.  But I'm not sure how hot a drive needs to get before it causes
problems.  I have a firewire drive right next to it that works fine,
so I'll do a little touch test to see if they're comparable when I get
home.  (The USB drive is the self-contained kind with its own
enclosure, by the way.  Cavalry brand.)

>  It would be nice if you could change the power save settings of the
>  drive, but I have not figured out how to do that on a USB connected
>  drive. I wish I could be of more help...

No problem, I appreciate your feedback!  It does seem like keeping it
awake is necessary.  And yet, I assume that drives that go to sleep
under Windows work okay.  I wonder how it works there?  Ideally, the
linux kernel drivers would work the same way.  I didn't realize it was
important to check for compatibility issues when getting a hard drive!

The latest: To keep it from going to sleep, I reinstated my cron job
that runs every minute, copying a dummy file on the USB drive:

* * * * * /bin/cp -f /misc/disk2/.dummy /misc/disk2/.dummy2 > /dev/null

I also am using autofs to handle mounting the drive.  I configured it
to timeout after 90 seconds.  My messages log is getting entries like
these:

Feb 15 10:48:08 pigpen kernel: kjournald starting.  Commit interval 5 seconds
Feb 15 10:48:08 pigpen kernel: EXT3 FS on sdd1, internal journal
Feb 15 10:48:08 pigpen kernel: EXT3-fs: mounted filesystem with
ordered data mode.
Feb 15 10:49:45 pigpen kernel: kjournald starting.  Commit interval 5 seconds
Feb 15 10:49:45 pigpen kernel: EXT3 FS on sdd1, internal journal
Feb 15 10:49:45 pigpen kernel: EXT3-fs: mounted filesystem with
ordered data mode.

I figured the cron job would keep autofs from timing out, but
apparently not.  I'm confused.  I changed the timeout to 210 seconds
and will see if anything's different....

reid

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