[CentOS] home directory server performance issues

Tue Dec 11 09:48:21 UTC 2012
John Doe <jdmls at yahoo.com>

From: Matt Garman <matthew.garman at gmail.com>
> I’m fairly certain I did not align the partitions optimally:
> Number  Start    End        Size        Type    File system  Flags
> 1      63s      465884s    465822s    primary  ext2        boot
> 2      465885s  134207009s  133741125s  primary              lvm
> Number  Start  End          Size        File system  Name  Flags
> 1      34s    5720768606s  5720768573s                    lvm
> Can anyone confirm that the partitions are not aligned correctly, as I
> suspect?  If this is true, is there any way to *quantify* the effects
> of partition mis-alignment on performance?  In other words, what kind
> of improvement could I expect if I rebuilt this server with the
> partitions aligned optimally?

They indeed do not look like aligned...
First, I am no expert but:
At one point , the minimum to do was to at least start on 64 instead of 63.
Now, if you add RAID stripes, 4k disks... it is more complicated.

You can see the effects on non alignment by looking at such images:

Formatting also takes alignment parameters.  By example, stride and stripe-width for ext...