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SubjectRe: [ANNOUNCE] util-linux-ng v2.17 (stable)
On 2010-01-08, at 14:43, H. Peter Anvin wrote:
> On 01/08/2010 01:33 AM, Karel Zak wrote:
>> fdisk:
>> - the fdisk command aligns newly created partitions to
>> minimum_io_size
>> boundary ("minimum_io_size" is physical sector size or stripe
>> chunk
>> size on RAIDs).
>> - the fdisk command supports disks with alignment_offset now.
> I think we should align, by default, much more aggressively than
> that --
> because frequently we just don't know what the real physical alignment
> is (think of flash media, which uses large erase blocks underneath.)
> Windows aligns partitions 1 MB boundaries by default now -- I think
> that's probably a reasonably good idea, at least for any disk that's
> not
> tiny, say 256 MB or less.

I agree whole heartedly. We steer users very sharply away from using
partitions at all, because on h/w RAID devices the 512-byte offset
from fdisk completely kills RAID-5/6 performance.

Making the default minimum alignment for DOS/GPT partitions makes a
lot of sense, and LVM PEs should be on 1MB boundaries as well (I don't
think that is the case today either).

Cheers, Andreas
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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