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--- correct_way_to_enable_trim_for_ssd_s_on_centos_6.5 [2014/05/26 07:22] – admin
+++ correct_way_to_enable_trim_for_ssd_s_on_centos_6.5 [2014/05/26 08:01] – [Correct way to enable trim] admin
@@ Line 1: / Line 1: @@
 =====Correct way to enable trim=====
-Use a more recent kernel, for example ELRepo's kernel-ml 3.14. Full support for TRIM was not added to the Linux kernel until version 3.7. But... since TRIM is officially supported on CentOS 6, you could assume that RH have backported all the necessary fixes for it to work properly.
+Use a more recent kernel. Full support for TRIM was not added to the Linux kernel until version 3.7. But... since TRIM is officially supported on CentOS 6, you could assume that RH have backported all the necessary fixes for it to work properly.
 ====Filesystem====
 Realtime discards can slow down performance, use scheduled fstrim instead.
@@ Line 7: / Line 7: @@
 ===Scheduled trim with fstrim===
-For example, configure a weekly fstrim job. Create **/etc/cron.weekly/fstrim**. This script will run fstrim on ext filesystems which are non removable and not rotational.<code>#! /bin/sh
+For example, configure a weekly fstrim job. Create **/etc/cron.weekly/fstrim**. This script will run fstrim on ext filesystems which are non removable and not rotational.<code>#!/bin/sh
+#this script will run weekly, will overwrite log.
+trimlog=/var/log/fstrim.log
+echo > $trimlog
 for mount in `lsblk -ro "rota,rm,fstype,mountpoint" | egrep "0 0 ext[2|3|4]" | cut -d " " -f4`; do
-	fstrim $mount
+  printf "`date` - `fstrim -v $mount`\n" >>$trimlog
 done</code>