dynamic harddisks are in missing-stat after reboot

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hello!
we use a windows 2003 R2 Server with two dynamic harddisks on a IBM San
store. after a planed restart both hds are present but in state missing. i
think the system lost the information that the hds are dynamic disks. it
seems that the systen think that the disks are basic disks.

does anybody knows how i can change the type to dynamic without lost data?
on the disks are the storage files from our echange-system :-(

thanks for all answers
best regards
wilfried


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