Hi All,
I'm running into a problem when I use the external journal option along with
ACLs. Without ACLs, I can see a significant performance delta between the
use of an internal journal and an external one. Under Netbench, the
difference is as much 2x to 3x. So, I definitely want to use this
capability. However, all of my testing was without ACLs being set. When I
went back and turned ACLs, the performance turned upside down on me.
Basically, the there is very little performance difference between internal
or external journal. And, in some cases, the external journal is slower
than the internal journal.
Any tips on how I should configure the ACLs so as to not degrade
performance?
To set the journaling up for external placement, I'm using "mkfs.xfs
/dev/md1 -l logdev=/dev/md0,size=10000b". For ACLs, I'm just using getfacl
to store the acls in a file till I can reapply them to the new directories
using "setfacl -set-file".
Thanks for the help,
-Mike
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