From: Matt Garman matthew.garman@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. https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
You can see the effects on non alignment by looking at such images: http://www.ateamsystems.com/blog/FreeBSD-Partition-Alignment-RAID-SSD-4k-Dri...
Formatting also takes alignment parameters. By example, stride and stripe-width for ext...
JD