diff options
Diffstat (limited to 'align/virt-alignment-scan.pod')
| -rwxr-xr-x | align/virt-alignment-scan.pod | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/align/virt-alignment-scan.pod b/align/virt-alignment-scan.pod index 3b6828b7..601c5e84 100755 --- a/align/virt-alignment-scan.pod +++ b/align/virt-alignment-scan.pod @@ -229,8 +229,10 @@ data combined, and the two blocks written back (4x I/O). New versions of the Linux kernel expose the physical and logical block size, and minimum and recommended I/O size. -For a typical hard drive with 512 byte sectors: +For a typical consumer hard drive with 512 byte sectors: + $ cat /sys/block/sda/queue/hw_sector_size + 512 $ cat /sys/block/sda/queue/physical_block_size 512 $ cat /sys/block/sda/queue/logical_block_size @@ -240,6 +242,19 @@ For a typical hard drive with 512 byte sectors: $ cat /sys/block/sda/queue/optimal_io_size 0 +For a new consumer hard drive with 4Kbyte sectors: + + $ cat /sys/block/sda/queue/hw_sector_size + 4096 + $ cat /sys/block/sda/queue/physical_block_size + 4096 + $ cat /sys/block/sda/queue/logical_block_size + 4096 + $ cat /sys/block/sda/queue/minimum_io_size + 4096 + $ cat /sys/block/sda/queue/optimal_io_size + 0 + For a NetApp LUN: $ cat /sys/block/sdc/queue/logical_block_size @@ -258,8 +273,8 @@ is 64K. For detailed information about what these numbers mean, see L<http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/newstorage-iolimits.html> -[Thanks to Mike Snitzer for providing NetApp data and additional -information.] +[Thanks to Matt Booth for providing 4K drive data. Thanks to Mike +Snitzer for providing NetApp data and additional information.] =head2 1 MB PARTITION ALIGNMENT |