On 05/27/2016 04:52 AM, Martin K. Petersen wrote:
"Peter" == Peter Rabbitson <rabbit+list@xxxxxxxxx> writes:
I want to disable trim on my system for good - yet there seems to be
no kernel boot parameter for this.
There's no global way to disable TRIM but you can disable it on a
per-device basis by setting /sys/block/sdN/queue/discard_max_bytes to
0.
That would be sufficient for me - I can enforce this with a udev rule.
However what you propose does not currently work:
root@Ahasver:~# cat /sys/block/sda/queue/discard_max_bytes
2147450880
root@Ahasver:~# echo 0 > /sys/block/sda/queue/discard_max_bytes
-bash: /sys/block/sda/queue/discard_max_bytes: Permission denied
root@Ahasver:~# uname -a
Linux Ahasver 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u4
(2016-02-29) x86_64 GNU/Linux
root@Ahasver:~# dpkg -l linux-image-3.16.0-4-amd64 | grep ii
ii linux-image-3.16.0-4-amd64 3.16.7-ckt20-1+deb8u4 amd64 Linux
3.16 for 64-bit PCs
What am I missing?
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
