SSDで遊ぼう

せっていをめも

cf. http://wiki.centos.org/HowTos/Disk_Optimization
cf. http://www.nuclex.org/blog/personal/80-aligning-an-ssd-on-linux

kouhei@lion:~$ sudo fdisk -S32 -H 32 /dev/sdd
Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-305255, default 1): 2
Last cylinder, +cylinders or +size{K,M,G} (2-305255, default 305255): 
Using default value 305255

Command (m for help): p

Disk /dev/sdd: 160.0 GB, 160041885696 bytes
32 heads, 32 sectors/track, 305255 cylinders
Units = cylinders of 1024 * 512 = 524288 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: ****************

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               2      305255   156290048   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

kouhei@lion:~$ sudo mkfs.ext4 -b 4096 -E stride=32,stripe-width=32 /dev/sdd1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=32 blocks, Stripe width=32 blocks
9773056 inodes, 39072512 blocks
1953625 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
1193 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.