Quite a bit of work is ongoing on this front. I'll list all that work in another email.
Meanwhile make a bz with the stat_sysdir output. We'll need that to determine the best way forward. David Johle wrote: > So in light of prior issues with lock contention and such due to > writing apache logs to shared files I have started storing them > locally on each node. I made a script to combine them nightly before > the statistics generator kicks off for the previous day's traffic analysis. > > This script, using logresolvemerge.pl, is actually writing the output > back to the shard volume for easy reference later. I figure I would > not have issues with this as it's a large amount of sequential writes > from a single node at off-peak time. However, It's been getting hung > with high CPU from the merger. > > I'm pretty sure I'm running into the famous "free space > fragmentation" problem, but wanted to confirm that this was the case > or see if there was additional troubleshooting I can do. > > Here's the disk, plenty of overall free space: > > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/mapper/mpath1 209725440 85311460 124413980 41% /san/live-websites > > > While my merging was going 100% of a CPU core, but the merged file > was not growing in size and not much I/O actually happening to the > shared volume, I did an strace to see what it was doing and got this: > > # strace -p 16844 > Process 16844 attached - interrupt to quit > read(3, "1\" 200 936 \"http://www.industria";..., 4096) = 4096 > write(1, ".NET CLR 1.1.4322; .NET CLR 2.0."..., 4096) = -1 ENOSPC (No > space left on device) > read(4, "oration&locationName=South+Jerse"..., 4096) = 4096 > write(1, "ivers=8&ngPipelines=600&kvtl230="..., 4096) = -1 ENOSPC (No > space left on device) > read(4, "1\" 200 936 \"http://www.industria";..., 4096) = 4096 > write(1, "gan+Boulevard&locationCSZ=Salem%"..., 4096) = -1 ENOSPC (No > space left on device) > read(3, "HTTP/1.0\" 200 4096 \"-\" \"WinampMP"..., 4096) = 4096 > write(1, "elta=.375&zoomlevel=6&label=Sout"..., 4096) = -1 ENOSPC (No > space left on device) > read(4, "HTTP/1.0\" 200 4096 \"-\" \"WinampMP"..., 4096) = 4096 > write(1, "ident/4.0; .NET CLR 1.1.4322; .N"..., 4096) = -1 ENOSPC (No > space left on device) > read(3, "0 36516 \"-\" \"Mozilla/5.0 (compat"..., 4096) = 4096 > > > Now I'm really worried about the cluster stability from other routine > writes that might fail soon. I know the typical workaround is to > reduce the node slots, but I don't have any excess slots to > spare. Are there any other tricks to improve/reduce freespace fragmentation? > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users@oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-users > _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-users
