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Date: Sun, 5 Nov 2006 00:38:11 +0100 (CET) From: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz> To: Albert Cahalan <acahalan@...il.com> Cc: kangur@...com.net, linux-kernel@...r.kernel.org Subject: Re: New filesystem for Linux > Re: New filesystem for Linux > > kangur@...com.net, mikulas@...ax.karlin.mff.cuni.cz, > linux-kernel@...r.kernel.org > > > Grzegorz Kulewski writes: >> On Thu, 2 Nov 2006, Mikulas Patocka wrote: >>> As my PhD thesis, I am designing and writing a filesystem, >>> and it's now in a state that it can be released. You can >>> download it from http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/ >> >> "Disk that can atomically write one sector (512 bytes) so that >> the sector contains either old or new content in case of crash." > > New drives will soon use 4096-byte sectors. This is a better > match for the normal (non-VAX!) page size and reduces overhead. The drive (IDE model, SCSI can have larger sector size) will do read-modify-write for smaller writes. So there should be no compatibility issues. (this possibility is in new ATA standard and there is a way how to detect physical sector size) But how will fdisk deal with it? Fdisk by default aligns partitions on 63-sector boundary, so it will make all sectors misaligned and seriously kill performance even if filesystem uses proper 8-sector aligned accesses. Mikulas - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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