Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thu, Apr 25, 2013 at 01:59:52PM +0000, Prater, James K. wrote: > We are using RHEL 6.4 this parameter set in the global common > configuration file and also on the haresources mount attributes. The > question is that I cannot change this parameter on the fly with the > "mount -o remount,barrier=1". With "tune2fs -l /dev/drbd0", > nobarrier is still enabled. The question is, does this parameter > propagates into the EXT4 attribute stack? Or do I have to clear it > in both drbd and the mount. Please don't hijack threads. The DRBD setting "barrier" has nothing to do with the file system mount option "barrier" -- other than that, if no volatile caches are involved, it is safe (and usually a performance gain) to disable both of them. You change the DRBD setting in the DRBD configuration, or with drbdadm/drbdsetup. You change mount options via fstab, or tune2fs and equivalents, and remount. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com