Jeff Garzik wrote: > > Speaking of alignment, when people were sending me 1K-sector > demonstration drives, they were making a big deal about even versus odd > alignment. Using the standard 512b sector interface on a 1K-sector disk > causes RMW as you expect -- but depending on the disk, the 1K may begin > on an odd sector rather than an even sector, because historically > partitions were often laid out on odd-numbered boundaries and/or offset > by one due to the boot sector. > > I can't say whether 1K drives are out there in production, or going to > make it into production, but Seagate was making a stink and sending out > samples, even asking me to present at IDEMA. > > However it is my -hope- that the industry goes straight to 4K sector > drives, and drops this even/odd nonsense. 4K-aligned should start at > zero, and anything else is uncivilized. > There is definitely RMW media out there, aplenty, sometimes with rather large physical sector sizes (128K, 256K). There is plenty of reason to align partitions. Doing odd alignment on the physical disk is obviously poison. Urk. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
