Pdflush грузит ядро на 100%

Да, диск скорее всего бедовый.

Где лог dmesg?

Здесь:

md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 1073741632k. md: md2: data-check done. md: data-check of RAID array md0 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 16777088k. md: md0: data-check done. md: data-check of RAID array md1 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 524224k. md: delaying data-check of md0 until md1 has finished (they share one or more physical units) md: delaying data-check of md3 until md1 has finished (they share one or more physical units) md: delaying data-check of md2 until md1 has finished (they share one or more physical units) md: md1: data-check done. md: delaying data-check of md2 until md0 has finished (they share one or more physical units) md: delaying data-check of md0 until md3 has finished (they share one or more physical units) md: delaying data-check of md3 until md2 has finished (they share one or more physical units) md: delaying data-check of md2 until md3 has finished (they share one or more physical units) md: delaying data-check of md0 until md3 has finished (they share one or more physical units) md: data-check of RAID array md3 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 1839216960k. md: md3: data-check done. md: delaying data-check of md0 until md2 has finished (they share one or more physical units) md: data-check of RAID array md2 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 1073741632k. md: md2: data-check done. md: data-check of RAID array md0 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 16777088k. md: md0: data-check done. md: data-check of RAID array md1 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 524224k. md: delaying data-check of md0 until md1 has finished (they share one or more physical units) md: delaying data-check of md3 until md1 has finished (they share one or more physical units) md: delaying data-check of md2 until md1 has finished (they share one or more physical units) md: md1: data-check done. md: delaying data-check of md3 until md0 has finished (they share one or more physical units) md: delaying data-check of md0 until md3 has finished (they share one or more physical units) md: delaying data-check of md2 until md3 has finished (they share one or more physical units) md: delaying data-check of md0 until md3 has finished (they share one or more physical units) md: data-check of RAID array md3 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 1839216960k. md: md3: data-check done. md: data-check of RAID array md2 md: delaying data-check of md0 until md2 has finished (they share one or more physical units) md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 1073741632k. md: md2: data-check done. md: data-check of RAID array md0 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. md: using 128k window, over a total of 16777088k. md: md0: data-check done. Adding 16777080k swap on /dev/md0. Priority:-1 extents:1 across:16777080k