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Does EXT4 really wear out a SSD after time?

post #1 of 14
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Hi,

Yesterday I dualbooted Win7 and Ubuntu on my SSD, (see thread: http://www.overclock.net/linux-unix/...her-drive.html ) Someone said that I should never use ext4 on my SSD, and some said that it was okay, one also said that I should use NILFS instead. Right now I'm really confused, I'm even scared to boot Ubuntu now :S I get different answers around the web, so really, does ext4 wear out my SSD? I'm not that concerned if the drive only begins to wear out after 10 years, because by then it has already been replaced... But if it's already wearing out right now, when I got ubuntu open, then I see it as a serious problem...
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post #2 of 14
There are some settings in Ubuntu to make in order to minimise wear to an SSD. Well, this was true of 9.10, not sure about 10.04. I'll do some googling and come back with a link
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post #3 of 14
Ok, here it is (from here
Quote:
OPTIMIZING SSD PERFORMANCE:

*

Note: (Skip this step if you have the hard disk Acer Aspire One)

The performance of the SSD drive can be significantly improved by a few tweaks described in an article by Jason Perlow (But ignore Tweak #1, which does not apply.). The most important of these are described here.

Change the file system mount options on SSDs to “noatime”

Edit /etc/fstab (gksudo gedit /etc/fstab) and change the the option “relatime” to “noatime”. The line for the root partition should then be something like:

UUID=f0ae2c59-83d2-42e7-81c4-2e870b6b255d / ext2 noatime,errors=remount-ro 0 1

Use the “noop” I/O scheduler

Edit /boot/grub/menu.lst using your favorite editor, and add "elevator=noop" as an option. The default kernel configuration, found in the last part of the file should be something like:

title Ubuntu 8.04.1, kernel 2.6.24-19-generic
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-19-generic root=UUID=f0ae2c59-83d2-42e7-81c4-2e870b6b255d ro quiet splash elevator=noop
initrd /boot/initrd.img-2.6.24-19-generic
quiet

In order for the changes to remain when updating the kernel, also in menu.lst, find the line

# defoptions=quiet splash

and add "elevator=noop" as an option:

# defoptions=elevator=noop quiet splash

REDUCING SSD WEAR:

*

Note: (Skip this step if you have the hard disk Acer Aspire One)

Frequent writes to the SSD will cause failure eventually. We can reduce the number of writes to the SSD by moving our logs to a temporary filesystem in RAM that gets destroyed at ever reboot. Now this means your logs will not be persistent across reboots making debugging difficult in some cases. This step is optional of course, so if you need the logs for an extended period of time do not follow these steps.

Open your fstab again, and add the following lines:

gksudo gedit /etc/fstab
tmpfs /var/log tmpfs defaults 0 0
tmpfs /tmp tmpfs defaults 0 0
tmpfs /var/tmp tmpfs defaults 0 0

There is currently a bug in sysklogd where it cannot handle booting with an empty /var/log directory (bug #290127). This can be fixed by modifying /etc/init.d/sysklogd:

Find this function:

fix_log_ownership()
for l in `syslogd-listfiles -a`
do
chown ${USER}:adm $l
done
}

..and replace it with this:

fix_log_ownership()
{
for l in `syslogd-listfiles -a --news`
do
# Create directory for logfile if required
ldir=$(echo ${l} | sed 's/[^\\/]*$//g')
if [ ! -e $ldir ] ; then
mkdir -p $ldir
fi
# Touch logfile and chown
touch $l && chown ${USER}:adm $l
done
}

Warning: this will cause some packages to fail mysteriously when they cannot access the log directories that were installed with the packages and then disappeared at reboot.

To rebuild the rest of the directory structure inside /var/log on each reboot, add these lines to /etc/rc.local above the 'exit 0' line:

for dir in apparmor apt ConsoleKit cups dist-upgrade fsck gdm installer news ntpstats samba unattended-upgrades ; do
if [ ! -e /var/log/$dir ] ; then
mkdir /var/log/$dir
fi
done

Note: discovered ATA 40-wire cable misdetection after resume (currently 2.6.27), causing hdparm down from 40MB/s to 25MB/s: filed http://bugzilla.kernel.org/show_bug.cgi?id=11879 for this issue -AndiM

Note: you may have to specify more directories if you have applications which use them, check the contents of /var/log/ for directories before rebooting/deleting them.

DISABLE SCROLLKEEPER:

(Skip this step if you have the hard disk Acer Aspire One)

ScrollKeeper is a cataloging system for documentation on open systems. Hardly anyone ever uses it and on the AAO's slow SSD it takes ages every time you install anything. Disable it and your installs will fly! Finally add a diversion to stop dpkg from overwriting your changes.

sudo mv /usr/bin/scrollkeeper-update /usr/bin/scrollkeeper-update.real
sudo ln -s /bin/true /usr/bin/scrollkeeper-update
sudo find /var/lib/scrollkeeper/ -name \\*.xml -type f -exec rm -f '{}' \\;
sudo dpkg-divert --local --divert /usr/bin/scrollkeeper-update.real --add /usr/bin/scrollkeeper-update
PLEASE NOTE!!!!!!!!!!!

This was supplied for the Acer Aspire One laptop, on 8.04. 2 years ago. This information is probably out of date, so more investigation is required
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by chemicalfan View Post
There are some settings in Ubuntu to make in order to minimise wear to an SSD. Well, this was true of 9.10, not sure about 10.04. I'll do some googling and come back with a link
But really, I know a SSD wears out all the time, but in real world performance, will I feel a difference?
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post #5 of 14
Ok, this link is even better (but again, I'm not sure about the latest Ubuntu)
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post #6 of 14
Oh, and the latest kernel (with TRIM support) hasn't been backported to Ubuntu yet, meaning your SSD's performance will decline over time. The only way round it is to get the latest source from kernel.org and compile it yourself. I'd hesitate to go down this road unless you're sure of the consequences (like, the lack of official support for this action)
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post #7 of 14
ext2 will be better on an SSD. Especially with the no-op elevator / I/O scheduler (or even better with the Simple I/O scheduler, but I don't think that's in mainline yet). btrfs will be even better, and is reliable enough to use for home use. In kernel version 2.6.34 there will be a ton of btrfs updates that will not only fix a lot of bugs, but also improve performance, especially for SSD's.

I don't know how well-supported btrfs is on Ubuntu, but I know it's fairly easy to switch to btrfs from ext{2,3,4}.
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post #8 of 14
Quote:
Originally Posted by LTC View Post
But really, I know a SSD wears out all the time, but in real world performance, will I feel a difference?
You won't feel a thing if your SSD has trim.

Quote:
Originally Posted by gonX View Post
ext2 will be better on an SSD. Especially with the no-op elevator / I/O scheduler (or even better with the Simple I/O scheduler, but I don't think that's in mainline yet). btrfs will be even better, and is reliable enough to use for home use. In kernel version 2.6.34 there will be a ton of btrfs updates that will not only fix a lot of bugs, but also improve performance, especially for SSD's.
I don't know how well-supported btrfs is on Ubuntu, but I know it's fairly easy to switch to btrfs from ext{2,3,4}.
Ext2 should only be used for /boot. Journaling file-systems are the way to go unless you want to wait forever for your disk for finish checking ever time you crash and if you do lose data it won't take forever to get it back.
http://www.dataclinic.co.uk/linux-fi...journaling.htm

Btrfs performance is getter better but it still isn't on par with the other more mature file-systems and at this point in time and it's still unstable.
http://www.phoronix.com/scan.php?pag...s_nilfs2&num=4
Edited by EpicToast - 5/11/10 at 2:46pm
post #9 of 14
As for the log files. The advice to mount them to tmpfs is stupid (that is unless you only have an SSD and no backup spin drive). If you have a spin drive, just create a separate /var partition on it and the log files will be written there.
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post #10 of 14
Her's an article I came across from Linux Magazine in 2009 touting a newer file system apparently better for SSDs. I have no experience with the hardware but this is pretty fascinating.

http://www.linux-mag.com/cache/7345/1.html
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