SSD In Linux

Posted on Mon 19 September 2011 in misc

In an effort to make my Dual Core 1.6 Centrino laptop perform abit better I thought I would splash out on a SSD. I picked this up for £75 By the way my laptop is only SATA 1.

A quick google of SSD Linux shows alot of different ideas and I thought I would record the ones I used.

BTW a quick benchmark of my previous SATA 1 Toshiba 60GB 5400 2.5 drive with[ hdparm -t]{.Apple-style-span} showed about 30MB/S.

Here's the steps I used.

1. Disk alignment

I used this guide which basically says, make sure each partition starts on a sector that is divisible by 512.

I quickly knocked up a OpenSUSE live usb stick (dd_rescue openSUSE-11.4-KDE-LiveCD-x86_64.iso /dev/sdX)

I then fired up fdisk with sudo fdisk -H 32 -S 32 /dev/sda and created a 3 partition layout. fdisk offered to start the partition on a sector divisible by 512 so very little work was needed here.

NB On a fresh install of OpenSUSE 11.4 and no optimisations hdparm -t was giving 117.45 MB/sec - already almost 4 times quicker!

2. Change Disk Scheduler

Given that disks have been on various patters before SSD's, operating systems have therefore been optimised for them by default. This describe them all. You can see which one your are currently using by doing

cat /sys/block/sda/queue/scheduler

based on I am going to use deadline scheduler and set the /sys/block/sda/queue/iosched/fifo_batch to 1

So in /etc/rc.d/boot.local I added:-

echo deadline > /sys/block/sda/queue/scheduler

echo 1 > /sys/block/sda/queue/iosched/fifo_batch

3. Enable TRIM (

This is easily enabled in any >= 2.6.33 kenel via fstab. Here's my entry for /

/dev/disk/by-id/ata-OCZ-VERTEX2_OCZ-F1B8655OI4BKW33W-part2 / ext4 noatime,acl,user_xattr,discard 1 1

4. Disable noatime <

Add the noatime option to fstab (see above example)