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virt-alignment-scan: Add additional data for 4K sector drives

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(thanks Matt Booth).
This commit is contained in:
Richard W.M. Jones
2011-10-27 13:30:22 +01:00
parent d9c4b702e7
commit 46e08a159a
1 changed files with 18 additions and 3 deletions
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21
align/virt-alignment-scan.pod
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@@ -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