[Info-vax] Unpleasant Disk Shadowing Surprise

[Phillip Helbig---undress to reply]

In article <4e95ebba$0$3883$c3e8da3$aae71a0a at news.astraweb.com>, JF
Mezei <jfmezei.spamnot at vaxination.ca> writes: 

> Rob Brooks confirmed that they do go into mount verify, a process
> necessary to determine if the remaining members of the shadowset are
> trustable (aka: valid data etc) before resuming service.

Normally, writes go to all members.  What happens when one member has a 
problem, for whatever reason (which might be transient---network cable 
loose, perhaps)?  I/O will hang for a while in the hope that it might 
come back and after a time the member with problems is expelled from the 
shadow set.  This can be adjusted with system parameters (and, these 
days, perhaps with SET SHADOW commands).