I just want to share some things I've found out about ssd drives.
I installed the ssd drive as /dev/sdc and created a gpt partition table
with parted. The fist partition, /dev/sdc1, is about 11G.
I created a ext4 filesystem and mounted as /mnt/ssd.
Next I created the root directories: bin, boot, dev, etc, home,
lib, media, mnt, opt, proc, root, sbin, srv, sys, tmp, usr, var.
Then a symbolic link: lib64 -> lib
[/mnt/ssd] $ cp -a /etc/* etc
I did the same for bin, sbin, lib, usr, root
I updated /boot/grub/grub.cfg and found I needed some parameters on the
boot line:
linux /vmlinuz-3.3.6-lfs-20120515 root=/dev/sdc1 rootfstype=ext4 ro
raid=noautodetect rootflags=data=writeback
The new items were rootfstype=ext4 and rootflags=data=writeback.
I did not initially create /run because I thought it was created in the
first bootscript, but found that it couldn't be created because the
filesystem is mounted as read only. I'll need to remove that line in
the boot script because it doesn't do anything. (mkdir -p /run)
I also had problems initially because I forgot to create
/dev/{console,null}.
I created separate partitions for /tmp and /var and copied the current
/var to the new partition.
The fstab now looks like:
/dev/sdc1 / ext4 noatime,discard,data=writeback 1 1
/dev/sda3 swap swap pri=1 0 0
/dev/sda1 /boot ext3 defaults 1 2
/dev/sda9 /usr/src ext3 defaults 1 2
/dev/sda11 /home ext3 defaults 1 2
/dev/sdb5 /var ext3 defaults 1 2
/dev/sdb6 /tmp ext3 defaults 1 2
The kernel messages stopped at 3.998941 seconds and the bootscripts
started. The start time for all scripts was 6 seconds starting at
16:45:15 for mountkernfs and finishing at 16:45:20 for sshd.
Previously the kernel was about about the same with the bootscripts
running about 10 seconds.
I don't think putting /boot on the ssd would make much of a difference.
From the time I hit enter in grub to the time the kernel messages
start is a second or less.
I then did a benchmark on rsync without the make check. When building
on /tmp, the CMMI time was 20 seconds. When I changed the build to /mnt
(on the ssd) the build time was 7.9 seconds.
Not bad.
-- Bruce
--
http://linuxfromscratch.org/mailman/listinfo/blfs-dev
FAQ: http://www.linuxfromscratch.org/blfs/faq.html
Unsubscribe: See the above information page
