Is my OCZ SSD aligned correctly? (Linux)
- by Barney Gumble
I have an OCZ Agility 2 SSD with 40 GB of space. I use it as a system drive in Debian Linux (Squeeze) and in my opinion it's really fast. But I've read a lot on aligning partitions and file systems... And I'm not sure if I succeeded in aligning the partitions correctly. Maybe the SSD could be even faster?? ;-)
I use ext4 and here is the output of fdisk -cul:
Disk /dev/sda: 40.0 GB, 40018599936 bytes
255 heads, 63 sectors/track, 4865 cylinders, total 78161328 sectors
Units = sectors of 1 * 512 = 512 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/sda1 * 2048 73242623 36620288 83 Linux
/dev/sda2 73244670 78159871 2457601 5 Extended
/dev/sda5 73244672 78159871 2457600 82 Linux swap / Solaris
My partitions were created just by the Debian Squeeze setup assistant. So I didn't care about the details of partitioning. But now I think maybe the installer didn't align it correctly? Actually, 2048 looks good to me (better than odd values like 63 or something like that) but I've no idea... ;-) Help plz!
According to some "SSD Alignment Calculator" I found on the web, the OCZ SSDs have a NAND Erase Block Size of 512kB and their NAND Page Size is 4kB.
2048 is divisible by 4 and 512. So are the partitions aligned correctly?
