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" <[email protected]> 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 connected_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:[email protected]] > Sent: Tuesday, January 20, 2009 8:13 PM > To: Roger Spellman; [email protected] > 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 connected_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 > > > > > >
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