Re: slow lvm
On Thursday 11 August 2011 07:48:45 Keith Edmunds wrote:
Do the disks have 1K sectors or 4K sectors?
On 11.08.11 11:37, mimo wrote:
fdisk -l /dev/sdd
hmmm, since when does fdisk show that?
Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes
It's 2T, it should be 4k/sec
Sector size (logical/physical): 512 bytes / 4096 bytes
See? It is...
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
that's why partisions should be rounded on 4K limit.
Device Boot Start End Blocks Id System
/dev/sdd1 * 1 1216 9764864 fd Linux raid autodetect
/dev/sdd2 1216 2432 9765888 fd Linux raid autodetect
/dev/sdd3 2432 8511 48828416 fd Linux raid autodetect
/dev/sdd4 8511 243201 1885151840+ fd Linux raid autodetect
the 'fdisk -lu /dev/sdd' will tell you boundaris on sector range.
fdisk -l /dev/sda
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
This disk tells it has 512B sectors, but that may be just configuration
and reality might be different.
Therefore you could try with 4K rounding too.
Disk identifier: 0x000e0666
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1216 9764864 fd Linux raid autodetect
/dev/sda2 1216 2432 9765888 fd Linux raid autodetect
/dev/sda3 2432 8511 48828416 fd Linux raid autodetect
/dev/sda4 8511 243201 1885151840+ fd Linux raid autodetect
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