linuxaudio.org

On 7/7/06, Pieter Palmers  wrote:

quoted text
> Loki Davison wrote:

>

> > On 7/7/06, Pieter Palmers  wrote:

> >

> >> carmen wrote:

> >> > On Thu Jul 06, 2006 at 02:00:05PM -0400, Dan Easley wrote:

> >> >> On 7/6/06, Pieter Palmers  wrote:

> >> >>> Paul Winkler wrote:

> >> >>>> On Thu, Jul 06, 2006 at 01:43:40PM +0200, Pieter Palmers wrote:

> >> >>>>> Modern harddisks use a lot of write caching on the controller to

> >> achieve

> >> >>>>> decent performance. So when power goes down when there is data

> >> in the

> >> >>>>> write cache, it is lost. The file system however 'thinks' that

> >> data

> >> has

> >> >>>>> been written correctly. This hence results in file system

> >> corruption.

> >> >> Thanks much for this whole thread.  It's added substance to what I

> >> >> previously thought was just personal paranoia and suspicion.

> >> >>

> >> >> I've been under the impression it's cheaper to buy used UPS's and buy

> >> >> replacement batteries for them.  Has anyone done this to good

> >> results?

> >> >

> >> > im guessing 2 drives , synched nightly via rsync, or in a RAID

> >> configuration, is cheaper, and friendlier for the environment than

> >> huge/heavy UPS batteries. i guess i'd invest in that if the electricity

> >> infrastructure in my area was particularly bad. or in combination with

> >> daytime solar replenishing to run completely off-grid.

> >> >

> >> The RAID does *not* help against power failures. been there, done that.

> >>

> >> rsync will do, but then you have to make sure that the outage does not

> >> occur when running rsync. Anyway it lowers the chance that you'll have

> >> problems.

> >>

> >> > soudns like overkill as a hedge against drive failure though.

> >> drives will

> >> fail.

> >>

> >> UPS'es don't prevent mechanical drive failure, but they do prevent

> >> 'soft' bad sectors. My belief is that these are the most common.

> >>

> >> I wouldn't think a 100€ UPS is more overkill than an extra 160G drive

> >> (costing about the same) for RAID/rsync mirroring.

> >>

> >> I've made up my mind about this: 'this UPS is to stay', but feel free

> >> not to agree of course ;)

> >>

> >> Pieter

> >>

> >

> > 100 euro! for 160G ouch! my 300 gb 16 mb cache sata2 drive was much

> > less than that!  I don't really have anything that vitial that loosing

> > it would really suck... guess if i ever make some decent recordings...

>

> I have the bad luck of living in an expensive country I guess:

>

> WD Caviar 1600JS : 160 Gb S-ATA II (7200/300-8Mb): 86 euro

> Seagate Barracuda 7200.9 160Gb S-ATA II 8Mb: 88 euro

> Maxtor 6V160E0 : 160Gb (7200/300-8Mb) SATA II: 78 euro

>

> MGE Protection Center 420: 89 euro

> MGE Protection Center 500 USB: 102 euro

>

> The 300Gb disks are around 120 euro here.

>

> Probably the you'll be able to get a UPS for less then too.

>

> Greets,

>

> Pieter

>

> PS: where did you get these prices?

>

>

135.00 AUD Australia Dollars   =  78.9844 EUR Euro

Maxtor 300gb
http://www.msy.com.au/Parts/PARTS.pdf
Good prices there on most stuff. Though probably more handy if you

live in Australia ;)
Loki