[Lustre-discuss] Recovery fails if clients not connected

[Roger Spellman]

> I believe you can connect the OSSs once the MDS has booted, and in
fact, I'm pretty 

> sure that the five in the 'connected_clients: 0/5' 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,
I'm pretty sure that the five in the 'connected_clients: 0/5' 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





 

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