Hi, Oliver.
Thanks for explanations.
> Roman Gorohov. <[EMAIL PROTECTED]> wrote:
>> Hello list.
>> There is a server with FreeBSD FreeBSD 4.11-STABLE(can't upgrade fornow) on
>> HP ProLiant DL140.
>> Disk system: <SEAGATE ST373207LC 0005> at scbus0 target 0 lun0(pass0,da0)
>> on a ASC-29320A.
>> If I do:
>> [EMAIL PROTECTED] ~]#dd if=/dev/zero of=bigfile bs=64k count=5000
>> 5000+0 records in
>> 5000+0 records out
>> 327680000 bytes transferred in 37.515699 secs (8734477 bytes/sec)
>> All is hung while dd working.
>>
>> Its look like that:
>> [EMAIL PROTECTED] ~]#systat -v
>> skip...
>> Disks da0 pass0 pass1 md0
>> KB/t 20.33 0.00 0.00 0.00
>> tps 812 0 0 0
>> MB/s 16.11 0.00 0.00 0.00
>> % busy 100 0 0 0
>>
>> skip...
>>
>> [EMAIL PROTECTED] ~]#vmstat -w 5
>> procs memory page disks faults cpu
>> r b w avm fre flt re pi po fr sr da0 md0 in sy cs us sy
>> id
>> 1 0 0 1996756 54208 42 23 25 7 39 336 0 0 531 638 404 21 5
>> 74
>> 1 6 0 2011488 13272 571 0 0 1 2506 8 129 0 1356 2125 159 3 4
>> 93
>> 4 27 0 2022852 4228 267 0 0 1 1657 4 272 0 1450 784 96 1
>> 3 96
>> 1 10 0 2027492 40220 449 5 0 12 3257 9384 574 0 1773 4366 189 8
>> 7 85
>> 1 10 0 2035064 25604 746 2 1 7 2965 4466 157 0 1380 4486 184 8
>> 7 85
>> 0 11 0 2030860 4228 515 2 1 3 2098 31 214 0 1412 3077 149 16
>> 5 79
>> 3 14 0 2042792 10004 1014 4 1 5 2787 4432 267 0 1440 1735 118 2
>> 4 94
>> 2 16 0 2062664 4228 301 0 1 2 2843 27 564 0 1759 1250 107 5
>> 4 91
>>
>> [EMAIL PROTECTED] ~]#iostat -w 5
>> tty da0 pass0 pass1 cpu
>> tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
>> 0 25 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 21 0 4 0 74
>> 1 109 62.56 242 14.81 0.00 0 0.00 0.00 0 0.00 7 0 9 0 83
>> 0 101 18.29 433 7.73 0.00 0 0.00 0.00 0 0.00 2 0 2 0 95
>> 0 76 26.45 281 7.25 0.00 0 0.00 0.00 0 0.00 3 0 4 0 93
>> 0 94 15.99 357 5.57 0.00 0 0.00 0.00 0 0.00 2 0 2 0 96
>> 0 15 16.04 667 10.45 0.00 0 0.00 0.00 0 0.00 0 0 3 1 96
>> 0 93 15.99 558 8.71 0.00 0 0.00 0.00 0 0.00 0 0 2 1 97
>> 0 80 16.16 252 3.98 0.00 0 0.00 0.00 0 0.00 0 0 1 0 98
>> 0 117 23.44 240 5.49 0.00 0 0.00 0.00 0 0.00 9 0 6 0 85
>>
>> Why this happen?
> The numbers from your vmstat output indicate that your
> machine is paging ("swapping"), i.e. it's running out
> or RAM.
That seems like true, and I forget to mention that 2/3 of swap is
located at physical disk(da0).
[EMAIL PROTECTED] ~]#swapinfo
Device 1K-blocks Used Avail Capacity Type
/dev/da0s1b 524160 463300 60860 88% Interleaved
/dev/rvn0b 1048448 578724 469724 55% Interleaved
Total 1572608 1042024 530584 66%
But what I can't understand - why such non-critical(as it seems to me) disk
activity,
cause 100% busyness for disk? Its claim to be 40.000MB/s transfers, but
sometimes its 100% busy when iostat show only 1 MB/s.
Regards, Roman.
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