Messages in this thread | | | Date | Sun, 27 Jun 1999 17:07:40 +0300 | From | Matti Aarnio <> | Subject | Re: [patch] pagecache-2.3.9-H3, bmap & ext2fs cleanup patch |
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On Sun, Jun 27, 1999 at 03:37:28PM +0200, Ingo Molnar wrote: > On Sun, 27 Jun 1999, Andrea Arcangeli wrote: > > BTW, I think that a filesystem that span over multiple devices could make > > better choices than raid, right? > > no, RAID is really a different concept, and it's filesystem independent. > multi-device filesystems _might_ be useful but the cleanest way of > handling striping and/or redundancy is IMO MD at the block device layer. > Caching and block allocation decisions are best done on the filesystem > level.
Right. They are orthogonal issues.
However do remember that our current blockdevice level limitation is 2G (or 4G ?) worth of 512 byte blocks, that is, 1 TB (maybe 2) for any given block device size.
Your filesystem can't grow over that if you are limited to single blockdevice per filesystem.
All that RAID supplies for a filesystem is single block device, however large/redundant/etc. that might be.
I am inclined to think that what we need out of the future file- systems is much more in multi-device spanning style, than any RAID/LVM/MD creation.
> -- mingo
/Matti Aarnio <matti.aarnio@sonera.fi>
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