Top on the MDS while OI_Scrub was running: ----8<---- Tasks: 2087 total, 2 running, 2084 sleeping, 0 stopped, 1 zombie Cpu(s): 0.2%us, 0.7%sy, 0.0%ni, 98.2%id, 1.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 65872364k total, 65376600k used, 495764k free, 45589240k buffers Swap: 20480460k total, 0k used, 20480460k free, 68636k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 22270 root 20 0 0 0 0 R 12.6 0.0 26:26.21 OI_scrub 310 root 20 0 0 0 0 S 9.0 0.0 1:12.51 kswapd3 5214 root 20 0 16612 2788 888 R 9.0 0.0 0:00.06 top 309 root 20 0 0 0 0 S 7.2 0.0 1:07.36 kswapd2 308 root 20 0 0 0 0 S 5.4 0.0 1:59.74 kswapd1 20618 root 20 0 165m 20m 1392 S 5.4 0.0 1:03.43 collectl 8972 root 20 0 0 0 0 S 1.8 0.0 0:52.41 kiblnd_sd_01_03 8976 root 20 0 0 0 0 S 1.8 0.0 2:38.67 kiblnd_sd_02_03 8978 root 20 0 0 0 0 S 1.8 0.0 0:50.81 kiblnd_sd_03_01 21878 root 20 0 0 0 0 S 1.8 0.0 0:06.54 mdt01_029 22005 root 20 0 0 0 0 S 1.8 0.0 0:17.01 mdt02_058 1 root 20 0 21436 1288 972 S 0.0 0.0 0:04.42 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.03 kthreadd 3 root RT 0 0 0 0 S 0.0 0.0 0:00.55 migration/0 4 root 20 0 0 0 0 S 0.0 0.0 0:00.63 ksoftirqd/0 5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 6 root RT 0 0 0 0 S 0.0 0.0 0:00.47 migration/1 7 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1 8 root 20 0 0 0 0 S 0.0 0.0 0:00.14 ksoftirqd/1 9 root RT 0 0 0 0 S 0.0 0.0 0:00.10 migration/2 10 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/2 11 root 20 0 0 0 0 S 0.0 0.0 0:00.46 ksoftirqd/2 12 root RT 0 0 0 0 S 0.0 0.0 0:00.75 migration/3 13 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/3 14 root 20 0 0 0 0 S 0.0 0.0 0:00.14 ksoftirqd/3 15 root RT 0 0 0 0 S 0.0 0.0 0:00.10 migration/4 16 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/4 17 root 20 0 0 0 0 S 0.0 0.0 0:00.22 ksoftirqd/4 18 root RT 0 0 0 0 S 0.0 0.0 0:00.40 migration/5 19 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/5 20 root 20 0 0 0 0 S 0.0 0.0 0:00.18 ksoftirqd/5 21 root RT 0 0 0 0 S 0.0 0.0 0:00.13 migration/6 ----8<----