SSD Trim... Just to be sure.

[fpdragon]

Hi,

I switched to Linux Mint Maya Cinnamon on my Laptop with a Super Talent SSD.

I just want to be sure:
When I install this on default, are TRIM commands used to handle wear leveling and cleanup SSD? I don't want to reduce the lifetime of my SSD ...

thx...

[oobetimer]

This is good to read: http://translate.google.fi/translate?sl ... %C3%A4riin

[fpdragon]

This is good to read: http://translate.google.fi/translate?sl ... %C3%A4riin

Thanks for the reply but it seems that this article has nothing to do with the trim command...

[DrHu]

The link given mentions trim and there is a linked entry in the text for TRIM, which gets you to various web sites discussing trim on various OS, windows and Linux
--however a direct Internet search gets this data
https://en.wikipedia.org/wiki/TRIM_(SSD_command)#Operating_system_support

Enabling unsupported operating systems
Where TRIM is not automatically supported by the filesystem, there are utilities which can send TRIM commands manually. Usually they determine which blocks are free and then pass this list as a series of TRIM commands to the drive. These utilities are available from various manufacturers (Intel,[34] G.Skill[41]) or as general utilities (hdparm since v9.17[42][43]).

And more specific trim commands available within Linux OS..
http://techgage.com/article/enabling_an ... nder_linux

[eanfrid]

To enable automatic TRIM commands, your partition must be mounted/formatted either in ext4fs or in btrfs and have a "discard" option entry on its mount options line in /etc/fstab.

Edit ahem DrHu posted while I was writing my post

[fpdragon]

To enable automatic TRIM commands, your partition must be mounted/formatted either in ext4fs or in btrfs and have a "discard" option entry on its mount options line in /etc/fstab.

Edit ahem DrHu posted while I was writing my post

Interresting...

Thanks to all.

[jazz.h]

These are the options in fstab I'm using with my Patriot ssd:

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ext4    errors=remount-ro,noatime,discard

But as you say, I don't know how can one be sure...? But then, you're not sure even in windows, there's no way you can confirm if trim is really being utilized...

Besides the fact that ssd Mint is incredibly fast

[mintybits]

I use the same fstab mount options as jazz.h

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UUID=91327070-918a-4416-ac41-a95d9496c65e     /     ext4    noatime,discard,errors=remount-ro     0     1

Another performance thing is to make sure your partitions start on "erase block" boundaries. SSDs typically use 512KiB erase blocks so your partitions should start on multiples of 1024, 512 byte sectors. Note that Disk Utility starts the first disk partition at sector 63.
For example:

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Disk /dev/sde: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 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: 0x32f3bda0

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1            1024   234433535   117216256   83  Linux
/dev/sde2       234433536   234440703        3584   82  Linux swap / Solaris

[eanfrid]

And here for my Sandisk Extreme (/boot is a dedicated 512MB ext2 partition) :

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LABEL=system      /         ext4   discard,noatime,barrier=0,data=writeback,commit=60,errors=remount-ro   0   1
LABEL=boot      /boot         ext2   defaults,noatime   0   2
tmpfs         /run         tmpfs   nosuid,noexec,nodev,size=200M,mode=755   0   0
tmpfs         /tmp         tmpfs   noexec,noatime,nosuid,nodev,size=6G,mode=1777   0   0
tmpfs         /run/shm      tmpfs   noexec,noatime,nosuid,nodev,size=2G,mode=1777   0   0