We have Exchange 2007 on Single copy cluster from last few days , our offline address book is not getting coped , in event viewer we get below event after we try to access exchangeoab share also same drive where the exchangeoab share is not available remotely as admin share , other drives are available , The server's configuration parameter "irpstacksize" is too small for the server to use a local device. Please increase the value of this parameter. microsoft recommends to add the registry value for irpstacksize , but why other shares on servers are working and other drives are remotely avialable as ,admin share , if you try to access drive where exchangeoab and databases are you gett below error not enough storage available to process this request. we do not want to restart and do fail over , so please if Microsoft can give us solution and why this problem is there.

Hi Salman, Per your description, it seems a issue related with server cluster issue, plase refer to below information: http://support.microsoft.com/?id=285089 You also could post the issue on be server forum, you will get more help from there. Regards! GavinPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.