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In Console.App I can see various log messages. I've diagnosed a Time Machine problem and searched for "backup". In the resulting messages from backupd I also noticed the message

27/07/11 16.01.59,562 mds: (Error) Volume: Could not find requested backup type:2 for volume

showed up (which is most likely not Time Machine related but has the word backup in it).

Any suggestions on what this is and how I can fix it?

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Do you think this is Time Machine related? Or were you adding "color" as to how you stumbled upon these messages? It could be as simple as a network mount failing of it's not really TM related. –  bmike Jul 27 '11 at 14:48
    
I do not know. My Google-fu fails on this message. –  Thorbjørn Ravn Andersen Jul 27 '11 at 15:24
    
Let me clarify - can you turn off time machine and see if that prevents the message from happening? –  bmike Jul 27 '11 at 15:46

1 Answer 1

I have only seen that in relation to Time Machine timing out when preparing a network sparse disk image for backup.(and I've seen it on Snow Leopard and rarely on Lion - but lion is young)

mds is very tightly intertwined in the time machine process, so it could just be time machine asking mds to do some work.

You'll have to disable time machine and watch for other network mounts failing - separate the two and you'll have narrowed it down to one bad actor.

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