Re: [POT] Which journalised filesystem ?

From: Alessandro Suardi <alessandro.suardi@oracle.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "André Dahlqvist" <andre.dahlqvist@telia.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [POT] Which journalised filesystem ?
Date: Thu, 04 Oct 2001 23:53:29 +0200	[thread overview]
Message-ID: <3BBCDA59.55A5E247@oracle.com> (raw)
In-Reply-To: <E15pFzU-0004H7-00@the-village.bc.nu>

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')