Carlos E. R. wrote:
The Tuesday 2007-06-19 at 16:17 +0200, Joachim Schrod wrote:
I bought an external USB disk, Seagate FreeAgent, [...]
After some time, the disk puts itself in some "sleep" mode.
All hardddisks made have that feature: after some minutes (15') without
any activity, they spin down. The time is configurable, and can be
activated/dissabled.
Now, external drives... that's interesting. I would report the problem to
bugzilla, the kernel should survive a disk sleep.
I'll think about that -- have to judge the entry writing effort
with the anticipated results of a 10.0 kernel error report.
But anyhow, you helped me further a lot:
In fact, I have reproduced your problem in my system (or a related
problem):
The command to enable/disable the sleep mode is hdparm:
nimrodel:~ # hdparm -C /dev/sdb
/dev/sdb:
drive state is: unknown
This did not work here either, but I got reminded that there is
sdparm to check and change the SCSI disk parameters. And voila,
here we are:
sdparm --command=ready /dev/sdc # check ready state
sdparm --command=start /dev/sdc # start a sleeping disk
sdparm --command=stop /dev/sdc # put a disk in standby
sdparm -al -f /dev/sdc # list all known mode flags
sdparm -6 -p po --clear=STANDBY /dev/sdc # turn off standby feature
sdparm -6 -p po --defaults /dev/sdc # establish it again
Now I just need to observe if the disk gets too hot after I turned
off the standby feature. Sadly, smartctl doesn't work for that
disk, so I have no reliable method of checking its temperature.
But that's a minor inconvenience compared to the state before.
Muchas gracias!
Joachim
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Joachim Schrod Email: [EMAIL PROTECTED]
Roedermark, Germany
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