[Tfug] And another one down

[Bexley Hall]

Hi Timothy,

On 9/9/2013 2:55 PM, Timothy D. Lenz wrote:
> I posted on the raid group asking about mixing a WD red with the segates
> that are there now and it doesn't sound good. First response was about
> drives being kicked out when they are still good until they where all
> changed to reds.

Did they say what the *criteria* was that caused the drives to
be "kicked out"?  I.e., are they seeing higher error rates
(one would think that would be a configurable threshold)?
Or, just "seagatophobia" on the part of the software??

> Also, they are saying that enterprise drives are more touchy about
> vibrations. That some high speed fans can cause them troubles. I would
> expect them to be more resistant to vibrations because in big servers
> you are going to have more drives and fans and things to cause
> vibrations and resonant vibrations which are even stronger.

I've never heard of drives being upset by (what amounts to)
"fan noise".  A fair number of machines, here, have been
"servers" over the years.  Never had any of them complain that
certain types of drives were "required".  As you said, all had
buckets of fans inside (I think one of my current servers has
12? fans)

Disks are considerably more tolerant of vibration than they
used to be; both "in use" and "in storage".

Any "hard data" that people want to offer?  Or, is this just
random "conclusions" that someone came up with to explain a problem
*they* were having (that they couldn't trace to anything else)?

I.e., to *prove* such an assertion, leave the "problem" drive
in place and replace the fan with other cooling mechanisms.
If doing this -- AND ONLY THIS -- causes the drive to "work
reliably" then you have an argument supporting that premise.

OTOH, replacing the drive and leaving the fans in place just
tells you that the (original) drive "didn't work" (-- in that
system).