In order to try to find the cause of the problem, I've set the atop interval to 1 second. It seems that when the problem occurs, there doesn't seem to be a particular activity of the processes (no additional RDDSK or WRDSK). Just when the disk becomes busy, atop shows that the "slab" value suddenly increases, then the disk becomes busy for several seconds with writes only. During this time, the "slab" value decreases.
For instance: ATOP - xvii 2012/02/21 10:40:25 1 seconds elapsed PRC | sys 0.07s | user 0.03s | #proc 186 | #zombie 0 | #exit 0 | CPU | sys 4% | user 1% | irq 0% | idle 180% | wait 15% | cpu | sys 3% | user 1% | irq 0% | idle 96% | cpu000 w 0% | cpu | sys 2% | user 1% | irq 1% | idle 82% | cpu001 w 14% | CPL | avg1 0.03 | avg5 0.20 | avg15 0.22 | csw 290 | intr 203 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 268.7M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 16% | read 0 | write 123 | avio 1 ms | ATOP - xvii 2012/02/21 10:40:26 1 seconds elapsed PRC | sys 0.11s | user 0.00s | #proc 186 | #zombie 0 | #exit 0 | CPU | sys 11% | user 2% | irq 0% | idle 27% | wait 160% | cpu | sys 6% | user 1% | irq 0% | idle 12% | cpu001 w 81% | cpu | sys 4% | user 1% | irq 0% | idle 15% | cpu000 w 80% | CPL | avg1 0.03 | avg5 0.20 | avg15 0.22 | csw 2489 | intr 511 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 271.4M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 83% | read 0 | write 380 | avio 2 ms | ATOP - xvii 2012/02/21 10:40:27 1 seconds elapsed PRC | sys 0.02s | user 0.02s | #proc 186 | #zombie 0 | #exit 0 | CPU | sys 5% | user 1% | irq 0% | idle 0% | wait 194% | cpu | sys 2% | user 0% | irq 0% | idle 0% | cpu001 w 98% | cpu | sys 3% | user 0% | irq 0% | idle 0% | cpu000 w 97% | CPL | avg1 0.03 | avg5 0.20 | avg15 0.22 | csw 116 | intr 325 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 271.4M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 100% | read 0 | write 245 | avio 4 ms | ATOP - xvii 2012/02/21 10:40:28 1 seconds elapsed PRC | sys 0.03s | user 0.00s | #proc 186 | #zombie 0 | #exit 0 | CPU | sys 3% | user 1% | irq 0% | idle 0% | wait 196% | cpu | sys 2% | user 1% | irq 0% | idle 0% | cpu000 w 97% | cpu | sys 1% | user 1% | irq 0% | idle 0% | cpu001 w 98% | CPL | avg1 0.03 | avg5 0.20 | avg15 0.22 | csw 72 | intr 255 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 271.3M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 100% | read 0 | write 211 | avio 4 ms | ATOP - xvii 2012/02/21 10:40:29 1 seconds elapsed PRC | sys 0.08s | user 0.02s | #proc 187 | #zombie 0 | #exit 0 | CPU | sys 9% | user 2% | irq 0% | idle 0% | wait 189% | cpu | sys 8% | user 1% | irq 0% | idle 0% | cpu000 w 91% | cpu | sys 2% | user 1% | irq 0% | idle 0% | cpu001 w 97% | CPL | avg1 0.27 | avg5 0.24 | avg15 0.24 | csw 815 | intr 699 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 271.0M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 100% | read 0 | write 291 | avio 3 ms | ATOP - xvii 2012/02/21 10:40:30 1 seconds elapsed PRC | sys 0.05s | user 0.02s | #proc 187 | #zombie 0 | #exit 1 | CPU | sys 3% | user 2% | irq 0% | idle 0% | wait 195% | cpu | sys 2% | user 1% | irq 0% | idle 0% | cpu000 w 97% | cpu | sys 1% | user 0% | irq 0% | idle 0% | cpu001 w 99% | CPL | avg1 0.27 | avg5 0.24 | avg15 0.24 | csw 143 | intr 455 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 270.6M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 101% | read 0 | write 368 | avio 2 ms | NET | transport | tcpi 1 | tcpo 1 | udpi 0 | udpo 0 | NET | network | ipi 1 | ipo 1 | ipfrw 0 | deliv 1 | NET | eth0 0% | pcki 1 | pcko 1 | si 0 Kbps | so 1 Kbps | ATOP - xvii 2012/02/21 10:40:31 1 seconds elapsed PRC | sys 0.06s | user 0.01s | #proc 187 | #zombie 0 | #exit 0 | CPU | sys 5% | user 1% | irq 0% | idle 0% | wait 194% | cpu | sys 2% | user 1% | irq 0% | idle 0% | cpu000 w 97% | cpu | sys 2% | user 0% | irq 0% | idle 0% | cpu001 w 98% | CPL | avg1 0.27 | avg5 0.24 | avg15 0.24 | csw 343 | intr 659 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 270.2M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 101% | read 0 | write 466 | avio 2 ms | NET | transport | tcpi 7 | tcpo 12 | udpi 0 | udpo 0 | NET | network | ipi 7 | ipo 12 | ipfrw 0 | deliv 7 | NET | eth0 0% | pcki 7 | pcko 12 | si 7 Kbps | so 12 Kbps | ATOP - xvii 2012/02/21 10:40:32 1 seconds elapsed PRC | sys 0.06s | user 0.00s | #proc 187 | #zombie 0 | #exit 0 | CPU | sys 3% | user 0% | irq 1% | idle 66% | wait 130% | cpu | sys 2% | user 0% | irq 0% | idle 66% | cpu000 w 32% | cpu | sys 1% | user 1% | irq 0% | idle 0% | cpu001 w 98% | CPL | avg1 0.27 | avg5 0.24 | avg15 0.24 | csw 252 | intr 566 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 269.7M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 101% | read 0 | write 425 | avio 2 ms | NET | transport | tcpi 5 | tcpo 9 | udpi 0 | udpo 0 | NET | network | ipi 5 | ipo 9 | ipfrw 0 | deliv 5 | NET | eth0 0% | pcki 5 | pcko 9 | si 6 Kbps | so 8 Kbps | ATOP - xvii 2012/02/21 10:40:33 1 seconds elapsed PRC | sys 0.04s | user 0.01s | #proc 188 | #zombie 0 | #exit 0 | CPU | sys 6% | user 2% | irq 0% | idle 75% | wait 117% | cpu | sys 2% | user 2% | irq 0% | idle 76% | cpu000 w 20% | cpu | sys 4% | user 0% | irq 0% | idle 0% | cpu001 w 96% | CPL | avg1 0.27 | avg5 0.24 | avg15 0.24 | csw 272 | intr 367 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 269.4M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | DSK | sda | busy 99% | read 3 | write 273 | avio 3 ms | ATOP - xvii 2012/02/21 10:40:34 1 seconds elapsed PRC | sys 0.04s | user 0.03s | #proc 191 | #zombie 0 | #exit 14 | CPU | sys 6% | user 2% | irq 0% | idle 15% | wait 178% | cpu | sys 5% | user 1% | irq 0% | idle 6% | cpu000 w 88% | cpu | sys 2% | user 0% | irq 0% | idle 8% | cpu001 w 90% | CPL | avg1 0.48 | avg5 0.29 | avg15 0.25 | csw 734 | intr 394 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 269.1M | SWP | tot 9.5G | free 9.4G | | vmcom 1.4G | vmlim 11.4G | DSK | sda | busy 98% | read 23 | write 133 | avio 6 ms | NET | transport | tcpi 1 | tcpo 2 | udpi 2 | udpo 6 | NET | network | ipi 3 | ipo 8 | ipfrw 0 | deliv 3 | NET | eth0 0% | pcki 1 | pcko 6 | si 3 Kbps | so 4 Kbps | NET | lo ---- | pcki 2 | pcko 2 | si 0 Kbps | so 0 Kbps | ATOP - xvii 2012/02/21 10:40:35 1 seconds elapsed PRC | sys 0.06s | user 0.04s | #proc 191 | #zombie 0 | #exit 0 | CPU | sys 4% | user 5% | irq 0% | idle 192% | wait 0% | cpu | sys 2% | user 4% | irq 0% | idle 94% | cpu000 w 0% | cpu | sys 1% | user 1% | irq 0% | idle 98% | cpu001 w 0% | CPL | avg1 0.48 | avg5 0.29 | avg15 0.25 | csw 310 | intr 168 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 269.0M | SWP | tot 9.5G | free 9.4G | | vmcom 1.3G | vmlim 11.4G | NET | transport | tcpi 13 | tcpo 14 | udpi 9 | udpo 7 | NET | network | ipi 22 | ipo 21 | ipfrw 0 | deliv 22 | NET | eth0 0% | pcki 20 | pcko 19 | si 48 Kbps | so 32 Kbps | NET | lo ---- | pcki 2 | pcko 2 | si 2 Kbps | so 2 Kbps | ATOP - xvii 2012/02/21 10:40:36 1 seconds elapsed PRC | sys 0.02s | user 0.04s | #proc 191 | #zombie 0 | #exit 0 | CPU | sys 4% | user 4% | irq 0% | idle 193% | wait 0% | cpu | sys 3% | user 4% | irq 0% | idle 93% | cpu000 w 0% | cpu | sys 2% | user 1% | irq 0% | idle 97% | cpu001 w 0% | CPL | avg1 0.48 | avg5 0.29 | avg15 0.25 | csw 276 | intr 203 | MEM | tot 3.9G | free 1.8G | cache 1.1G | buff 171.4M | slab 269.0M | SWP | tot 9.5G | free 9.4G | | vmcom 1.4G | vmlim 11.4G | DSK | sda | busy 0% | read 0 | write 1 | avio 0 ms | NET | transport | tcpi 16 | tcpo 16 | udpi 1 | udpo 0 | NET | network | ipi 17 | ipo 16 | ipfrw 0 | deliv 17 | NET | eth0 0% | pcki 17 | pcko 16 | si 34 Kbps | so 43 Kbps | -- Vincent Lefèvre <vinc...@vinc17.net> - 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