Background: Windows Server 2008 Standard, Exchange Server 2007.
I have been getting warning messages from Exchange server when full backup was running.
ID= 510; Src= ESE; User= ; Catg= Performance ; D/T= 07/19/2014 19:05:35; EventDesc= MSExchangeIS (6788) First Storage Group: A request to write to the file "E:\ExchangeSvr\Mailbox Database.edb" at offset 2958442496 (0x00000000b0564000) for 8192 (0x00002000) bytes succeeded, but took an abnormally long time (61 seconds) to be serviced by the OS. In addition, 21 other I/O requests to this file have also taken an abnormally long time to be serviced since the last message regarding this problem was posted 86100 seconds ago. This problem is likely due to faulty hardware. Please contact your hardware vendor for further assistance diagnosing the problem.
Full backup starts at 7PM on a external hard disk. And the error message appeared at 7PM as soon as the backup started.