FreeBSD 7 server in hang with nagios

[Wojciech Puchar]

> When I try to log in console after insert username: "root" the server stay
> in hang and i can't insert  password...
>
it is locked. on first console you should see kernel messages


> How do I know if disk subsystem is locked ?
>
>
> which value and where can i set kern.maxbcache ? or do You suggest
if you didn't change it - it's fine