[OpenAFS] vos listvol and vos exam

Steve Devine sdevine@msu.edu
Thu, 28 Jun 2007 09:53:29 -0400

Steven Jenkins wrote:
> On 6/28/07, *Steve Devine* <sdevine@msu.edu <mailto:sdevine@msu.edu>>
> wrote:
>     Steven Jenkins wrote:
>     >
>     >
>     > On 6/28/07, *Steve Devine* <sdevine@msu.edu
>     <mailto:sdevine@msu.edu> <mailto:sdevine@msu.edu
>     <mailto:sdevine@msu.edu>>>
>     > wrote:
>     >
>     >     We have switched some of our servers over to binaries compiled
>     >     with fast
>     >     restart.
>     >
>     >
>     >
>     > Others may disagree, but my opinion is that Fast Restart is not yet
>     > ready for production use.  Testing is always helpful, though.
>     Man I'm sorry to hear that .. we used this because we wanted to
>     shorten
>     the down time for bringing a server back on line when it has 1.2
>     possible disk space. That a long salvage window but maybe it would
>     have
>     been worth it.
> I was talking about something else not being ready for production, not
> Fast Restart (which is fine for production).  My apologies.
> Fast Restart can shorten your startup times, but it leaves the System
> Administrator to do the salvaging.  Were I to use Fast Restart, I would
> - parse the output of FileLog after startup (or vos listvol vs vos
> listvldb output) to get a list of volumes to salvage manually,
> - possibly prioritize those (eg, bring RW's online first, not RO's
> that have good copies elsewhere, etc)
> - manually salvage them
> I'd have that in a script to be run after a restart. 
> The benefit of Fast Restart is that even if you have a lot of volumes
> that need to be salvaged, the fileserver can be serving other volumes
> while you manually salvage the rest.  Keep in mind that you'll have to
> salvage those one at a time or bos will shut the fileserver down.  If
> you have to salvage a lot of volumes, Fast Restart will actually slow
> down your recovery time, so you'll want to consider that trade-off. 
> (ie, you can't salvage in parallel while the fileserver is running)
> Steven
Well from what I can see I am not sure I can count on the FileLog. Is
there anyway to make the fileserver keep more than  FileLog and
FileLog.old ?

Steve Devine
Network Storage and Printing
Academic Computing & Network Services
Michigan State University

506 Computer Center
East Lansing, MI 48824-1042

Baseball is ninety percent mental; the other half is physical.
- Yogi Berra