sluggish disk performance.
savage at savage.za.org
Mon Aug 21 16:42:54 UTC 2006
> In the last episode (Aug 21), Chris Knipe said:
>> Disks ad0 ofod intrn
>> KB/t 16.83 %slo-z 35456 buf
>> tps 103 4 tfree 414 dirtybuf
>> MB/s 1.70 20988 desiredvnodes
>> % busy 98 5247 numvnodes
>> 4223 freevnodes
>> Got 1 ATA100 Seagate 120GB disk in there at the moment.... 1.7MB/s at
>> 98% busy? Surely, that figure is WAY low??? I'd expect atleast
>> about 10MB/s on ATA100.
> That number's about right for random I/O and small blocksizes, which is
> what the KB/t field shows. If you were doing sequential I/O, the KB/t
> field would be at or near 128. Are you also running a "du", "cvs
> update", or other command likely to be doing random disk accesses?
ALTER TABLE on a 200MB mySQL table?
I guess its time for a dedicated disk then....
More information about the freebsd-questions