Hard disk keeps turning off or disconnecting?

[Gilles Gravier]

Hi!

On 12/08/2012 20:51, Colin Law wrote:
> On 12 August 2012 18:58, Gilles Gravier <ggravier at fsfe.org> wrote:
>> Hi!
>>
>> I have a strange problem. Ubuntu 12.04. All latest updates and kernel. I
>> used to have a 2TB disk connected by USB 2.0 port. I replaced this disk
>> (a Western Digital) with a 3TB (same brand, connected on same USB port).
>> Now, every 3 or 4 days, suddenly, the disk gets disconnected. As if it
>> wasn't mounted anymore. Didn't have the problem with the 2TB.
>>
>> But... I seem to recall having had that a long time ago on another
>> disk... and that this was due to some power management mode on the
>> disk... that had to be turned off...
>>
>> Does that ring a bell to anybody on this list? Any magical command to
>> tell the machine to tell the disk that this is a server and I don't want
>> spin-downs?
>>
>> Luckily, this is an ext4 volume... so I don't lose any data. I just have
>> to turn off the machine, turn off the disk, then turn everything back
>> on... But this is clearly sub-optimal. I would like the machine to keep
>> running...
> Does dmesg tell you anything after it goes off?
>

Next time it turns off... I will check. :) Forgot to do that today. :(

Gilles.