Have a couple week old upgrade install of Exchange 2007 (from 2003) that has started dismounting the datastore. Everything works fine again once it's restarted. Service never stops. Getting the following in the event log... Event Type:ErrorEvent Source:ESEEvent Category:General Event ID:481Date:11/1/2007Time:6:11:26 AMUser:N/AComputer:WSCJTCEX1Description:MSExchangeIS (2400) First Storage Group: An attempt to read from the file "D:\Exchange\Mailbox\First Storage Group\Mailbox Database.edb" at offset 12213092352 (0x00000002d7f50000) for 24576 (0x00006000) bytes failed after 11 seconds with system error 1117 (0x0000045d): "The request could not be performed because of an I/O device error. ". The read operation will fail with error -1022 (0xfffffc02). If this error persists then the file may be damaged and may need to be restored from a previous backup. For more information, click http://www.microsoft.com/contentredirect.asp. Event Type:ErrorEvent Source:MSExchangeISEvent Category:General Event ID:1159Date:11/1/2007Time:6:11:26 AMUser:N/AComputer:WSCJTCEX1Description:Database error Disk IO error occurred in function JTAB_BASE::EcRetrieveColumnByPtagId while accessing the database "First Storage Group\Mailbox Database". For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.Data:0000: 5b 44 49 41 47 5f 43 54 [DIAG_CT0008: 58 5d 00 00 0e 02 00 00 X]......0010: ff 64 12 00 00 00 00 00 d......0018: 00 03 00 02 00 00 1c 6f .......o0020: 00 10 0f 01 04 80 1c 6c ......l0028: 00 10 0f 01 04 80 1c 5c ......\0030: 00 10 0f 01 04 80 d3 17 ......0038: 40 10 0f 01 04 80 d3 15 @.....0040: 40 10 0f 01 04 80 b5 25 @....%0048: 40 10 0f 01 04 80 d2 55 @....U0050: 60 20 0f 01 04 80 0b 00 ` .....0058: ae 67 0f 01 04 80 1c 6f g....o0060: 00 10 0f 01 04 80 1c 6c ......l0068: 00 10 0f 01 04 80 1c 5c ......\0070: 00 10 0f 01 04 80 d3 17 ......0078: 40 10 0f 01 04 80 d3 15 @.....0080: 40 10 0f 01 04 80 b5 25 @....%0088: 40 10 0f 01 04 80 d2 55 @....U0090: 60 20 0f 01 04 80 0b 00 ` .....0098: ae 67 0f 01 04 80 1c 6f g....o00a0: 00 10 0f 01 04 80 1c 6c ......l00a8: 00 10 0f 01 04 80 1c 5c ......\00b0: 00 10 0f 01 04 80 d3 17 ......00b8: 40 10 0f 01 04 80 d3 15 @.....00c0: 40 10 0f 01 04 80 b5 25 @....%00c8: 40 10 0f 01 04 80 d2 55 @....U00d0: 60 20 0f 01 04 80 40 00 ` ...@.00d8: 8f 66 0f 01 04 80 d2 55 f...U00e0: 60 20 0f 01 04 80 02 01 ` .....00e8: 96 0e 0f 01 04 80 d2 55 ....U00f0: 60 20 0f 01 04 80 0b 00 ` .....00f8: 08 67 0f 01 04 80 d2 55 .g...U0100: 60 20 0f 01 04 80 02 01 ` .....0108: 76 67 0f 01 04 80 d2 55 vg...U0110: 60 20 0f 01 04 80 02 01 ` .....0118: 96 0e 0f 01 04 80 d2 55 ....U0120: 60 20 0f 01 04 80 02 01 ` .....0128: b0 67 0f 01 04 80 d2 55 g...U0130: 60 20 0f 01 04 80 02 01 ` .....0138: 76 67 0f 01 04 80 d2 55 vg...U0140: 60 20 0f 01 04 80 02 01 ` .....0148: 96 0e 0f 01 04 80 d2 55 ....U0150: 60 20 0f 01 04 80 03 00 ` .....0158: c8 67 0f 01 04 80 d2 55 g...U0160: 60 20 0f 01 04 80 0b 00 ` .....0168: ae 67 0f 01 04 80 1c 6f g....o0170: 00 10 0f 01 04 80 1c 6c ......l0178: 00 10 0f 01 04 80 1c 5c ......\0180: 00 10 0f 01 04 80 d3 17 ......0188: 40 10 0f 01 04 80 d3 15 @.....0190: 40 10 0f 01 04 80 b5 25 @....%0198: 40 10 0f 01 04 80 d2 55 @....U01a0: 60 20 0f 01 04 80 0b 00 ` .....01a8: ae 67 0f 01 04 80 1c 6f g....o01b0: 00 10 0f 01 04 80 1c 6c ......l01b8: 00 10 0f 01 04 80 1c 5c ......\01c0: 00 10 0f 01 04 80 d3 17 ......01c8: 40 10 0f 01 04 80 d3 15 @.....01d0: 40 10 0f 01 04 80 b5 25 @....%01d8: 40 10 0f 01 04 80 d2 55 @....U01e0: 60 20 0f 01 04 80 0b 00 ` .....01e8: ae 67 0f 01 04 80 1c 6f g....o01f0: 00 10 0f 01 04 80 1c 6c ......l01f8: 00 10 0f 01 04 80 1c 5c ......\0200: 00 10 0f 01 04 80 d3 17 ......0208: 40 10 0f 01 04 80 d3 15 @.....0210: 40 10 0f 01 04 80 b5 25 @....%0218: 40 10 0f 01 04 80 @.... Any ideas? Thanks, Ginny

Ginny Keller wrote: MSExchangeIS (2400) First Storage Group: An attempt to read from the file "D:\Exchange\Mailbox\First Storage Group\Mailbox Database.edb" at offset 12213092352 (0x00000002d7f50000) for 24576 (0x00006000) bytes failed after 11 seconds with system error 1117 (0x0000045d): "The request could not be performed because of an I/O device error. ". ...Description:Database error Disk IO error occurred in function JTAB_BASE::EcRetrieveColumnByPtagId while accessing the database "First Storage Group\Mailbox Database". it seems pretty clear to me that you have hardware issues with the disk and/or disk adapter. i'd try running running tests on the hardware and then a repair on the database. Troubleshooting Disk Problems http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/prork/prcb_dis_xdgb.mspx?mfr=true Repairing Exchange Databases http://technet.microsoft.com/en-us/library/aa996436.aspx

Yes - That has been my thinking as well - but so far I haven't found any issues with the hardware.

Try repairing the database as mentioned above. If it finds and repairs issues, defrag the database as well.

Thanks. I'm thinking about moving the database to local storage to eliminate that as a problem.

how/where are they stored now?

Stored on a SAN. LUN owned by the blade the exchange server is on. Going to try and move to local drive and see if that makes a difference (as a diagnostic on the SAN - which doesn't show any problems)

you should try the database repair first. read the above article.

Ginny, Were you able to fix the problem ou were seeing on your exchange 207 box. I'm having similar issues, but not sure what is causing it.

Hello After running err.exe 0xffffc02, it reports Disk I/O error, so i suggest you first move mailbox in the database in the problem disk into another disk ASAP; pls read the link: http://support.microsoft.com/kb/812452/en-us; how to move mailbox from one mailbox store to another one; http://technet.microsoft.com/en-us/library/bb124797.aspxthen check the problem disk, and evaluate it whether can use in production environment; hope it helps -jack