Hello all, I recently deployed a new CentOS 6.3 file server, and soon after I noticed that the load was consistenly at around 4, even with no obvious activity. After checking around a bit, the only unusual thing I could find is that the xfsaild threads are all consistently in D state: root 1744 0.0 0.0 0 0 ? D Nov16 7:46 [xfsaild/dm-2] root 1756 0.0 0.0 0 0 ? D Nov16 7:44 [xfsaild/dm-1] root 1759 0.0 0.0 0 0 ? D Nov16 7:57 [xfsaild/dm-3] root 1762 0.0 0.0 0 0 ? D Nov16 5:59 [xfsaild/dm-0] On another CentOS 6.2 box, I don't see this symptom; the xfsaild threads are all in S state. I checked around for many other things that I'd normally expect to be pegging the load, but didn't find anything out of the ordinary. (See https://groups.google.com/group/comp.os.linux.misc/browse_thread/thread/c9b2a1d60eb25fac for more details.) The new box is an up to date CentOS 6.3 box with the stock kernel: Linux xxxxxxxx 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux The storage backends are a software RAID1 (three of the filesystems) and a 3ware 9750-backed 11-disk RAID6. I don't have any unusual mount options, and the filesystems were created with mkfs.xfs with no options. I searched the web and the list archives, and did find some issues with xfsaild, but they all either seemed out of date (one thread mentioned that an issue would be fixed in 2.6.30) or with more complicated symptoms (other processes hanging in D state). But this server seems perfectly fine from what I can tell; I've noticed no performance issues either in informal observations or with actual measured read/write speeds, and the smbd and nfsd processes are all generally in S, so they are not waiting on IO. The big question is, is this actually a problem, or is it nothing to worry about? If it's a problem, is it in XFS, or if not, what other steps can I take to try to determine the root cause? Thanks, --keith -- kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
