[CentOS] ext4, 4k sector alignment
John R Pierce
pierce at hogranch.com
Mon Jul 25 23:35:48 UTC 2011
On 07/25/11 3:54 PM, Les Mikesell wrote:
> Device Boot Start End Blocks Id System
> /dev/sdh1 1 91201 732572001 fd Linux raid autodetect
>
> It doesn't need to boot. And the 3rd member doesn't need to
> autodetect, although I do want to be able to mount it independently if
> needed. Should it work to use the raw disk instead of a partition?
thats by "cylinder", which is an old MSDOS legacy thing. I believe
parted and probably some other programs let you partition by sector instead.
you previously wrote...
On 07/25/11 2:44 PM, Les Mikesell wrote:
> >> 255 heads, 63 sectors/track, 91201 cylinders
> >> Units = cylinders of 16065 * 512 = 8225280 bytes
so, a 'cylinder' is 8225 kbytes per that. simply cutting that down by
a few kbytes will get you on your 4K boundary. right now a cylinder is
255*63 = 16065 sectors. which is most certainly not divisible by 8 (8
512 byte sectors is 4K bytes)
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
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