Hi there I have a 4-node GlusterFS (3.0.2 -- the one bundled with Ubuntu 10.04) cluster set up in RAID 10, and it's working beautifully. I have an rsync job that is busy copying about 7TB onto that cluster, and I can mount the cluster and browse etc., so it seems to be configured correctly. I am having big issues with Apache, though. Whenever I try to access the cluster or write to it -- even small files -- the Apache process hangs. After 2 minutes, I get this in /var/log/messages: [ 6120.883314] INFO: task apache2:3349 blocked for more than 120 seconds. [ 6120.883321] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 6120.883326] apache2 D 0000000000000000 0 3349 1 0x00000004 [ 6120.883342] ffff8801ddaa7e48 0000000000000282 ffffffff81662ca0 ffff8801ddaa7dc8 [ 6120.883345] 0000000000000000 ffff8801ddaa7e10 ffff8801a1386478 ffff8801ddaa7fd8 [ 6120.883347] ffff8801a13860c0 ffff8801a13860c0 ffff8801a13860c0 ffff8801ddaa7fd8 [ 6120.883350] Call Trace: [ 6120.883352] [<ffffffff81059e80>] ? autoremove_wake_function+0x0/0x40 [ 6120.883357] [<ffffffffa005ebd5>] request_wait_answer+0xd5/0x290 [fuse] [ 6120.883360] [<ffffffff81059e80>] ? autoremove_wake_function+0x0/0x40 [ 6120.883364] [<ffffffffa005ee14>] fuse_request_send+0x84/0xa0 [fuse] [ 6120.883368] [<ffffffffa00627d4>] fuse_setlk+0x164/0x1b0 [fuse] [ 6120.883372] [<ffffffffa0062a44>] fuse_file_flock+0x34/0x50 [fuse] [ 6120.883375] [<ffffffff8112f3df>] sys_flock+0x10f/0x1d0 [ 6120.883378] [<ffffffff81009ba8>] system_call_fastpath+0x16/0x1b [ 6120.883381] [<ffffffff81009b40>] ? system_call+0x0/0x52 I have mounted the cluster on that Apache server using the glusterfs command without --disable-direct-io-mode. I have done some searching and found mod_glusterfs, but I've also read that that's deprecated. Can anyone see something that I'm doing wrong? - Neil
