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Andreas Dilger <adilger@clusterfs.com> wrote: >> On Jan 18, 2006 22:06 +0900, Takashi Sato wrote:> > As a disk tends to get large, a disk storage has had a capacity to > > supply multi-TB. But now, ext3 can't support more than 8TB filesystem > > when blocksize is 4KB. That's why I think ext3 needs to be > > more than 8TB.> > > > Therefore I think filesystem size can increase on architectures > > which has more than 4KB pagesize by extending blocksize to pagesize on > > ext3. For example, the following is in case of ia64. (Blocksize have > > already been supported up to pagesize on ext2. Why is the max blocksize > > restricted to 4KB on ext3?)> > > > Max filesystem size on ia64:> > Original :4096(blocksize) * 2^31 = 8TB > > After modification [pagesize=16KB(default)]:16384(blocksize) * 2^31 = 32TB > > After modification [pagesize=64KB(max)] :65536(blocksize) * 2^31 = 128TB> > Just for others' info - the fill_super change has been tested in the past > by Sonny Rao at IBM also. e2fsprogs has supported this for a long time > already. I have a vague memory that there's some piece of metadata (per-block-group info, I think) which will overflow at 8kb blocksize. I say this in the hope that you'll remmeber what it was ;) > > - ext3_readdir> > Currently read-ahead 16 sectors when reading a directory, but not > > if blocksize is more than 8KB. Then I modified to read-ahead > > one fs-block if blocksize is more than 8KB. I've rewritten ext3 directory readahead to use the generic pagecache functions, so changes here shouldn't be needed. But I haven't yet got around to performance-testing it. ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.16-rc1/2.6.16-rc1-mm2/broken-out/ext3_readdir-use-generic-readahead.patch - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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