[squid-users] aio_queue_request: WARNING - Disk I/O overloading

Using Squid 2.4STABLE1 the first day I got lots of this messages in cache.log.
I use "aufs". What's the problem? I think the disk is to slow.
iostat show often blocking processes and very long disk service times!
Should I use two cache directories on several disks instead of unsing only one (doews squid balance the load) ?

                    extended device statistics
    r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
 ...
    2.4 5.6 12.8 28.6 0.0 0.3 0.0 35.6 0 7 c0t1d0
...
                    extended device statistics
    r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
...
    0.2 6.8 1.6 37.2 0.0 0.3 0.0 38.3 0 6 c0t1d0
...
                    extended device statistics
...
    5.6 26.0 44.0 186.4 0.0 7.9 0.0 248.6 0 35 c0t1d0

Or maybe it helps to use another storage system like "diskd" to queue the write requests?

Thanks
        Uwe

ash-2.03# cat cache.log|grep aio_queue_request
2001/03/22 11:40:01| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:40:16| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:40:16| aio_queue_request: Queue Length: current=787, high=821, low=81, duration=20
2001/03/22 11:40:31| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:40:31| aio_queue_request: Queue Length: current=1419, high=1461, low=81, duration=35
2001/03/22 11:40:46| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:40:46| aio_queue_request: Queue Length: current=2001, high=2040, low=81, duration=50
2001/03/22 11:41:01| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:41:01| aio_queue_request: Queue Length: current=2694, high=2723, low=81, duration=65
2001/03/22 11:41:16| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:41:16| aio_queue_request: Queue Length: current=3271, high=3302, low=81, duration=80
2001/03/22 11:41:31| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:41:31| aio_queue_request: Queue Length: current=3872, high=3900, low=81, duration=95
2001/03/22 11:41:36| aio_queue_request: Async request queue growing uncontrollably!
2001/03/22 11:41:36| aio_queue_request: Syncing pending I/O operations.. (blocking)
2001/03/22 11:41:36| aio_queue_request: Synced
2001/03/22 11:43:46| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:44:01| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:44:01| aio_queue_request: Queue Length: current=793, high=827, low=81, duration=20
2001/03/22 11:44:16| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:44:16| aio_queue_request: Queue Length: current=1181, high=1235, low=81, duration=35
2001/03/22 11:44:31| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:44:31| aio_queue_request: Queue Length: current=1459, high=1519, low=81, duration=50
2001/03/22 11:44:46| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:44:46| aio_queue_request: Queue Length: current=1687, high=1731, low=81, duration=65
2001/03/22 11:45:01| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:45:01| aio_queue_request: Queue Length: current=1838, high=1885, low=81, duration=80
2001/03/22 11:45:16| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:45:16| aio_queue_request: Queue Length: current=2189, high=2229, low=81, duration=95
2001/03/22 11:45:31| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:45:31| aio_queue_request: Queue Length: current=2669, high=2709, low=81, duration=110
2001/03/22 11:45:46| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:45:46| aio_queue_request: Queue Length: current=3005, high=3035, low=81, duration=125
2001/03/22 11:46:01| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:46:01| aio_queue_request: Queue Length: current=3358, high=3389, low=81, duration=140
2001/03/22 11:46:16| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:46:16| aio_queue_request: Queue Length: current=3703, high=3744, low=81, duration=155
2001/03/22 11:46:28| aio_queue_request: Async request queue growing uncontrollably!
2001/03/22 11:46:28| aio_queue_request: Syncing pending I/O operations.. (blocking)
2001/03/22 11:46:28| aio_queue_request: Synced
2001/03/22 11:48:30| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:48:45| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:48:45| aio_queue_request: Queue Length: current=336, high=378, low=81, duration=20
2001/03/22 11:49:00| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:49:00| aio_queue_request: Queue Length: current=589, high=643, low=81, duration=35
2001/03/22 11:49:15| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:49:15| aio_queue_request: Queue Length: current=609, high=661, low=81, duration=50
2001/03/22 11:49:30| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:49:30| aio_queue_request: Queue Length: current=837, high=867, low=81, duration=65
2001/03/22 11:49:45| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:49:45| aio_queue_request: Queue Length: current=967, high=1004, low=81, duration=80
2001/03/22 11:50:00| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:50:00| aio_queue_request: Queue Length: current=1139, high=1166, low=81, duration=95
2001/03/22 11:50:15| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:50:15| aio_queue_request: Queue Length: current=1181, high=1225, low=81, duration=110
2001/03/22 11:50:30| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:50:30| aio_queue_request: Queue Length: current=1338, high=1371, low=81, duration=125
2001/03/22 11:50:45| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:50:45| aio_queue_request: Queue Length: current=1291, high=1378, low=81, duration=140
2001/03/22 11:51:00| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:51:00| aio_queue_request: Queue Length: current=1357, high=1432, low=81, duration=155
2001/03/22 11:51:15| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:51:15| aio_queue_request: Queue Length: current=1469, high=1493, low=81, duration=170
2001/03/22 11:51:30| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:51:30| aio_queue_request: Queue Length: current=1592, high=1630, low=81, duration=185
2001/03/22 11:51:45| aio_queue_request: WARNING - Disk I/O overloading
2001/03/22 11:51:45| aio_queue_request: Queue Length: current=1604, high=1632, low=81, duration=200
Received on Thu Mar 22 2001 - 05:30:37 MST