Messages in this thread | | | Date | Sat, 9 Aug 2008 15:21:44 +0200 | From | Pavel Machek <> | Subject | Re: tools support for non-512 byte sector sizes |
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Hi!
> > - some disk makers have sort of agreed not to do that, and > > expect forever to hide the larger underlying sector size > > behind a virtual 512 (of course, this imposes alignment > > restrictions, but that's a smaller problem) > > yes, this is happening also. > > There will be 3 types of disks eventually: > 1) those that report a 512-byte sector size, and are really a 512-byte > size. This is nearly all disks today. > > 2) those that report a 512-byte sector size, but are really a > 4096-byte size, and the drive does the conversions and > read/modify/write. T10 and T13 are looking to add commands to > expose this different underlying physical sector size so the OS > could be aware of it. This is primarily being driven to mitigate > any problems that may happen with "legacy" OSs that are not aware > of the difference.
How is this going to work with journaling? This has nasty property that if you are writing to sector n during powerfail, disk may also kill sectors n-3, n-2 and n-1..... and that's bad right?
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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