Re: hard drive problem
- From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
- Date: Sun, 27 Aug 2006 10:50:06 GMT
Aragorn wrote (in part):
IDE hard disks are intended to be used only about 8 hours per day, with
about 2 hours in total during that 8-hour timespan of being under heavy
load.
SCSI hard disks are intended to be up 24/7, with about 80% of that time
being under heavy load. Their MTBF - I know, it's just a number - is
usually around 1'000'000 hours, which boils down to about 138 years under
continuous service.
I tend to believe the MTTF number. MTBF is not important, since you never
get a second failure as hard drives are not reparable anymore. But most
people do not seem to know what MTTF is. Assuming 1 million hour MTTF, if
you have 138 hard drives in your system, you will be averaging a failure per
year.
My personal advice would be this... *Always* make backups, regardless of
the type of hard disks you're using, and regardless of whether they're used
as standalone disks or in RAID arrays. Use SCSI disks for systems that
require a standalone disk - e.g. because you can't afford two SCSI disks -
in a mission-critical environment - with the word "mission-critical" in a
very subjective context.
I am not sure about this. My big machine has 4 SCSI hard drives and 2 EIDE
drives. I already have 2 more SCSI drives on hand to replace the EIDE ones,
but I am too busy to change them. Changing the hardware is pretty simple,
but I want to move some partitions around, and one of them is the boot
drive, so that is somewhat harder, so I am putting it off (still). I think I
will change them when my kitchen remodelling project is complete.
I would rather use SCSI drives because I do not want to bother with RAID,
Most people find SCSI far too expensive. So plainly and simply, buy IDE
disks and use RAID. They're dirt-cheap these days, so best is to make use
of it while you can...
and because I want to know what is on each drive for optimization of seeks
and transfers when running IBM's DB2 dbms. But I recognize that what one
does with the hard drives depends critically on what one plans to do with
the entire system.
--
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