When multiple SMB collections exist, only one collection can crawl at a time, the remaining warning "Can't crawl collection. We are already crawling this type/server occurs for all but one collection in the admin/overview page. During this 'state' the crawl_watch.log [aka Collection Management Log] has entries suggesting crawls on other collections have started:
Showing last 250 messages in crawl_watch.log.
Fri Jan 23 17:54:05 2015 - Crawling scotto-sentbox
Fri Jan 23 17:54:04 2015 - Crawling scotto-mail
Fri Jan 23 17:53:57 2015 - Crawling chimera
Fri Jan 23 17:53:57 2015 - Running service Collections recrawl
When multiple SMB collections exist, only one collection can crawl at a time, the remaining warning "Can't crawl collection. We are already crawling this type/server occurs for all but one collection in the admin/overview page. During this 'state' the crawl_watch.log [aka Collection Management Log] has entries suggesting crawls on other collections have started:
Showing last 250 messages in crawl_watch.log.