gmirror Cannot add disk ad5 to gm0 (error=22)

[Miroslav Lachman]

Miroslav Lachman wrote:

> gmirror forget and insert helped:
> 
> root at track ~/# gmirror deactivate -v gm0 ad5
> No such provider: ad5.
> root at track ~/# gmirror forget -v gm0
> Done.
> root at track ~/# gmirror insert -v gm0 ad5
> Done.
> 
> root at track ~/# gmirror status
>       Name    Status  Components
> mirror/gm0  DEGRADED  ad4
>                       ad5 (0%)
> 

Something is definitely wrong. Gmirror status still shows 0% after 
couple of minutes (normaly synchronization progress is about 1% per minute)

systat -vmstat shows less then 1MB/s instead of usual 40MB/s, but 100% busy.

Disks   ad4   ad5
KB/t    121   128
tps       4     4
MB/s   0.45  0.45
% busy   83   103

Is there any chance to found source of problems without step by step 
replacement of each component? I can't believe that I have bad cables in 
4 new machines or bad hard drives in each machine... :o(

totally tired
Miroslav Lachman