I think the MTBF has much do with the load which is on the disk; the
more reads and especially the more writes you have on one disk, so
sooner it will be broken.
The MTBF seems to be a very theoretical value which is given by
manufacturers, because if you follow the guess (the pratice) that 80% of
all reads and writes are done on the same sectors of a hdd, you have to
divide the MTBF by 8; you will not get 30000 MTBF (300000 MTBF from
manufacturer) but it is very close.
Greetings, Dietmar
A James Lewis wrote:
>
> That's interesting because my figures 15000 - 30000 hours is 2 - 4
> years... that's fairly similar!
>
> On 12 May 1999 [EMAIL PROTECTED] wrote:
>
> > Hi
> >
> > experience has shown that the disks in our HP machines live for round about 2
>years minimum and 5 years maximum, operating day by day.
> > The air condition within the machines is very different and belongs to the
>surrounding; but I haven't seen any differences between the MTBF of hot and cold
>rooms (maybe they are to close to each other here).
> >
> > Mostly (the data disks) start to have read and write errors, which increase from
>week to week.
> >
> > Greetings, Dietmar
> >
> > >----- Urspr�ngliche Nachricht -----
> > >Absender: [EMAIL PROTECTED]
> > >Betreff: Re: Swap on raid
> > >Empf�nger: Dietmar Stein
> > >Kopie-Empf�nger: [EMAIL PROTECTED] , [EMAIL PROTECTED]
> > >Datum: 12. Mai 1999 01:13
> > >
> > >
> > > Do other people have opinions on the "Lifetime" MTBF of a harddrive... My
> > > experience is about 15000 hours continuous operation.
> > >
> > > I've seen manufacturers claim 300000 hours MTBF, but that's not realistic
> > > in my experience... mabe 30000 in a more controlled environment with good
> > > aircon etc....
> > >
> > > Any other opinions?
> > >
> > >
> > > On Tue, 11 May 1999, Dietmar Stein wrote:
> > >
> > > > Hi
> > > >
> > > > Ok - I understand what you are meaning; I think we have just different
> > > > opinions towards lifetime of a harddrive.
> > > > Maybe, I will go on using only one disk for swap - but it is interesting
> > > > seeing other opinions concerning lifetime of a hdd and security.
> > > >
> > > > Greetings, Dietmar
> > > >
> > > > Luca Berra wrote:
> > > > >
> > > > > On Mon, May 10, 1999 at 07:26:53PM +0200, Dietmar Stein wrote:
> > > > > > Hi
> > > > > >
> > > > > > At work we got much HP-Workstations and -Servers; everyone got a
> > > > > > swap-partition which is of same size as physical memory (or even
> > > > > > bigger).
> > > > > hp-ux uses swap partitions as a dump device, something i'd love
> > > > > to see on linux systems sooner or later.
> > > > >
> > > > > anyway some swap space may be needed since there are process that allocate
> > > > > tons of virtual memory, and they don't use it.
> > > > > if the machine swaps occasionally i think it is acceptable
> > > > > if i have to use swap i wan't it on a raid device.
> > > > >
> > > > > L.
> > > > >
> > > > > --
> > > > > Luca Berra -- [EMAIL PROTECTED]
> > > > > Communications Media & Services S.r.l.
> > > >
> > > > --
> > > > "For those about to rock - we salute you!"
> > > > Dietmar Stein, Systemadministrator UNIX/Linux
> > > > http://home.t-online.de/home/dstein2203
> > > > [EMAIL PROTECTED], [EMAIL PROTECTED]
> > > >
> > >
> > > A.J. ([EMAIL PROTECTED])
> > > Linux boots, Windows Re-Boots.
> > > Linux - Commoditising Operating Systems since 1991.
> > >
> > >
> >
>
> A.J. ([EMAIL PROTECTED])
> Linux boots, Windows Re-Boots.
> Linux - Commoditising Operating Systems since 1991.
--
"For those about to rock - we salute you!"
Dietmar Stein, Systemadministrator UNIX/Linux
http://home.t-online.de/home/dstein2203
[EMAIL PROTECTED], [EMAIL PROTECTED]
