dwmw2 at infradead.org
Wed Dec 8 04:54:12 EST 1999
Orono at m-sys.com said:
> The only way to be resistant to power failures in the file system
> level is to use a log-structured file system.
> I heard ext3 is log-structured but I am sure one of the Linux guys here
> knows more about this,
ext3 is a journalling filesystem. I believe that it's not log-structured.
Journalling is sufficient for protection from power failures. Stephen,
would you care to elaborate on the difference?
> Any other file system that takes power failures into account, (I am afraid
> to guess NFTL ????).
I believe that NTFS is also journalling but not log-structured.
> Some of our customers use their own home brewed LFSs and do it successfully.
Personally, I'm inclined to believe that we should run a filesystem directly
on the flash device - rather than faking a block device and running a 'normal'
filesystem on top of that.
I've been rushed off my feet here with other things for a while, but as soon as
I get back to it, after I've fixed the NFTL and DiskOnChip Millennium support,
that's what I'm intending to look at.
If you're running ext2 on a DiskOnChip you should mount it with the noatime
option if you can - this will eliminate a lot of write activity.
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