Changing the tape library settings to sequential mode throws the tape library offline.
説明
The following error messages are written to the NetVault logs:
1] Error 2014/06/23 08:19:04 0 Media BCKUPCS101 (BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL)) Load media in 'DRIVE 1:BCKUPCS101' failed
With sub text: SCSI 17 0 71904 CMD SENSE KEY 'NOT READY ' [2] - ASC 3a ASCQ 00 SCSI 18 0 71904 CMD SENSE INFO 'MEDIUM NOT PRESENT' SCSI 20 0 71904 CMD RETURN VALUE 2 TAPESCSI 41 0 71904 No Media in device TAPESCSI 114 0 71904 Do A Load Media (END) TAPESCSI 45 0 71904 Load Media (END) DEVMGR 40 1 71904 Failed to load device DEVMGR 2 0 71904 Send Manager Msg (BEGIN)
2] Error 2014/06/23 08:19:04 0 Media BCKUPCS101 'BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL): DRIVE 1:BCKUPCS101' has gone down 3] Error 2014/06/23 09:18:34 0 Media BCKUPCS101 (BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL)) Move media 'EWM DEV & QAS' (DYP654L4) <sap_ewm_system> from 'SLOT 2' to 'DRIVE 1:BCKUPCS101' failed
With sub text: CHGSCSI 22 0 81832 CMD MOVE MEDIUM [ a5 00 00 01 10 01 01 00 00 00 00 00 ] CAM 4 0 81834 Sense Key: '5', Ext Sense: '3b', Qual: 'd' CHGSCSI 24 0 81834 CMD STATUS 'CHECK CONDITION' [2] CHGSCSI 25 0 81834 CMD SENSE KEY 'ILLEGAL REQUEST' [5] - ASC 3b ASCQ 0d CHGSCSI 74 0 81834 CMD SENSE INFO 'DESTINATION ELEMENT FULL' CHGSCSI 204 0 81834 tDevRet = DEV_INVALID_REQUEST
4] Error 2014/06/23 09:18:34 0 Media BCKUPCS101 'BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL): DRIVE 1:BCKUPCS101' has gone down 5] Error 2014/06/23 10:29:07 0 Media BCKUPCS101 (BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL)) Position media in 'DRIVE 2:BCKUPCS101' failed
With sub text: SCSI 16 0 92907 CMD STATUS 'CHECK CONDITION' [2] SCSI 17 0 92907 CMD SENSE KEY 'NOT READY ' [2] - ASC 3a ASCQ 00 SCSI 18 0 92907 CMD SENSE INFO 'MEDIUM NOT PRESENT' SCSI 20 0 92907 CMD RETURN VALUE 2 TAPESCSI 4 0 92907 Position to segment return (2) (END) DEVMGR 96 1 92907 Position segment failed
With sub text: TAPESCSI 2 0 100346 Close Device LIST 17 0 100346 FALSE = ListWalk(0x80c3768, 0xf754381a, 0xffc4fea0) SCSI 14 0 100346 CMD PREVENT/ALLOW MEDIA REMOVAL [ 1e 00 00 00 00 00 ] CAM 222 19 100346 Failed to send SG_IO ioctl (No such device) SCSI 15 0 100346 CMD failed: errno 19
7] Error 2014/06/24 01:30:07 2237 Media BCKUPCS101 (BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL)) Move media 'EWM PRD System TAPE2' <sap_ewm_prd> from 'DRIVE 2:QEWCS101' to 'SLOT 7' failed
With sub text: CHGSCSI 22 0 3006 CMD MOVE MEDIUM [ a5 00 00 01 01 01 10 06 00 00 00 00 ] CAM 4 0 3007 Sense Key: '5', Ext Sense: '53', Qual: '3' CHGSCSI 24 0 3007 CMD STATUS 'CHECK CONDITION' [2] CHGSCSI 25 0 3007 CMD SENSE KEY 'ILLEGAL REQUEST' [5] - ASC 53 ASCQ 03 CHGSCSI 74 0 3007 CMD SENSE INFO 'MEDIUM REMOVAL PREVENTED BY DATA TRANSFER ELEMENT' CHGSCSI 204 0 3007 tDevRet = DEV_INVALID_REQUEST
8] Error 2014/06/24 01:32:17 2237 Media BCKUPCS101 (BCKUPCS101: SL_00L4U78T0700_LL0 (IBM 3573-TL)) Drive 'DRIVE 1:QEWCS101' has incorrect media ''Tape 2' (DYP523L4) <sap_pi_prd>'
原因
Sequential Mode setting is not supported, as NetVault Backup needs to have 100% control of all its backup devices, otherwise backup/device/media issues will occur.
対策
As per the following KBA we mention that Sequential Mode and Multipathing are NOT supported, as NetVault Backup needs to have 100% control over its devices:
Random: In random mode, the library allows the server's (host's) application software to select any data cartridge in any order.
Sequential: In sequential mode, the library's firmware predefines the selection of the cartridges. After initialization, the firmware causes the library to select the first available cartridge found (counting from the I/O Station through the last slot in your library) for loading into the drive.
The following KBA also mentions that Random Mode is the preferred selection:
