Re: [POT] Which journalised filesystem ?

Alessandro Suardi
2001-10-04T21:51:05Z

Alan Cox wrote:
>
> > > Alan mentioned this was something to do with the IBM hard disk
> > > having strange write-cache properties that confuse ext3.
> >
> > Which IBM harddrive(s) does this? How can one check if it does?
>
> Its not specifically IBM, there are two sets of things to watch out for
>
> - Cache flush as a nop/unimplemented. This is legal in all but the
> most recent ATA specification. The spec has been tightened so that
> problem will go in time
>
> - Some IBM laptop drives appeared to fail to write back the cache on
> machine shutdown/suspend etc. The exact rights/wrongs/details on
> that one haven't been pinned down because the folks concerned
> swapped a couple of drives for different ones, saw the problem
> vanish and being a large organisation had the supplier replace the
> other fifty odd.

[asuardi@dolphin asuardi]$ dmesg | grep hda
ide0: BM-DMA at 0x0860-0x0867, BIOS settings: hda:DMA, hdb:pio
hda: IBM-DJSA-220, ATA DISK drive
hda: 39070080 sectors (20004 MB) w/1874KiB Cache, CHS=2432/255/63, UDMA(33)
hda: hda1 hda2 hda3 hda4 < hda5 hda6 hda7 hda8 >

This one has been used in the last 4 months without any issue
doing lots of shutdowns, suspends, kernel rebuilds etc. ;)

--alessandro

"this is no time to get cute, it's a mad dog's promenade
so walk tall, or baby don't walk at all"
(Bruce Springsteen, 'New York City Serenade')