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

-- 
Matus UHLAR - fantomas, [email protected] ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Micro$oft random number generator: 0, 0, 0, 4.33e+67, 0, 0, 0...