[Lustre-discuss] Recovery fails if clients not connected

[Klaus Steden]

Hrm, I think you¹re right, I¹m getting fuzzy on some of the details.
Andreas¹ posting explained it pretty clearly ... although I¹ve apparently
deleted somewhat foolishly. If you still have a copy of that message, would
you mind forwarding it to me?

cheers,
Klaus

On 1/21/09 9:13 AM, "Roger Spellman" <roger at terascala.com> etched on stone
tablets:

>> > I believe you can connect the OSSs once the MDS has booted, and in fact,
>> I¹m pretty 
>> > sure that the five in the Œconnected_clients: 0/5¹ are in fact your OSS
>> nodes. Each 
>> > OST maintains a connection to the MDS while the file system is mounted, so
>> they 
>> > will be included in the connection count on the MDS.
>  
> Klaus, thanks for this information. But, the 0/5 is the number of clients.  An
> MDT is a client of an OST, not the other way around.
>  
> 
> 
> From: Klaus Steden [mailto:klaus.steden at technicolor.com]
> Sent: Tuesday, January 20, 2009 8:13 PM
> To: Roger Spellman; lustre-discuss at lists.lustre.org
> Subject: Re: [Lustre-discuss] Recovery fails if clients not connected
>  
> 
> Hi Roger,
> 
> I believe you can connect the OSSs once the MDS has booted, and in fact, I¹m
> pretty sure that the five in the Œconnected_clients: 0/5¹ are in fact your OSS
> nodes. Each OST maintains a connection to the MDS while the file system is
> mounted, so they will be included in the connection count on the MDS.
> 
> However, regardless of the state ‹ if your MDS is online and the MDT is
> mounted, you can start up the OSS nodes and corresponding OSTs at any time;
> clients attempting to make transactions will have their I/O operations block
> (or fail, depending on the MDS config) until the missing nodes come back
> online.
> 
> hth,
> Klaus
> 
> 
> 
> 
>  
> 


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20090121/667e276c/attachment.htm>