From 46e08a159a86d993a44830d70da442cd073859c2 Mon Sep 17 00:00:00 2001 From: "Richard W.M. Jones" Date: Thu, 27 Oct 2011 13:30:22 +0100 Subject: [PATCH] virt-alignment-scan: Add additional data for 4K sector drives (thanks Matt Booth). --- align/virt-alignment-scan.pod | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/align/virt-alignment-scan.pod b/align/virt-alignment-scan.pod index 3b6828b..601c5e8 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 -[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 -- 1.8.3.1