Am 02.08.2015 um 19:12 schrieb Ken Smith kens@kensnet.org:
Chris Murphy wrote:
On Sat, Aug 1, 2015 at 3:34 PM, Robert Nichols rnicholsNOSPAM@comcast.net wrote:
On 08/01/2015 12:05 PM, Chris Murphy wrote:
The problem with gparted is that it works only in units of megabytes. There is no way to move a partition to a particular sector or, for that matter, do much of anything _exactly_.
I'm not sure why granularity finer than 1MiB is necessary. But setting that aside, with a rotational drive with 4KiB sectors, you're better off with 1MiB alignment than not being 4KiB aligned at all. Depending on the drive and workload misalignment can cause a brutally bad performance hit. And if it doesn't then I wouldn't worry about changing anything.
Thanks everyone. That's the advice I need. The partition is ext4. I'll copy it to other media and rearrange the partitions and copy it back.
the alignment can be checked with:
blockdev --getalignoff /dev/foo
if a '0' is returned, the partition is aligned
-- LF