Forum Discussion
Hyper-V Host with 5 VMs (50-2500GB each)
2500GB = 2.5TB which is the native uncompressed capacity of a LTO6 tape. To backup all your 5 VM's, you must be using compression. Depending on your data type, compression can vary hence you may have exceed the capacity of your tape.
There are also no outstanding alerts with tape change request.
Note that these alerts go away when the job is cancelled or BE services are restarted. You would have to check for such alerts when the problem occurs.
- Controller is a H240 SAS HBA
- hardware compression was and is activated
- a copy of the whole data from disk to tape consumes 2.02 TB on a 2.38 TB Tape. Compression ratio is 1.3:1 so there is space left (300+GB)
- the error occurs after 255GB on an empty tape (overwritable / not appendable) always with the same VHD
- there was no media request in the warning history after 2017/11/23.
- i tested the VM exclusively and was "live on stage" when the tape turned offline. there was no media request for i knew when it would happen
- there is a Tape0 and a Tape1 (Tape0 was replaced due to hardware error a few months ago and is still listed as "deactived") Tape1 is the only present tape device
ADAMM LOG attached
best regards
- Larry_Fine7 years agoLevel 6
Is the H240 set to Simple mode, rather than RAID mode? It appears to be a dual mode card and only one mode would support tape. https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04496620
These entries from the adamm.log appear to either be a SAS communications failure or the tape device simply vanished. But I agree that your description of the issue and the apparent reproducability of the issue make me suspicious of the data also. Unfortunately, I personally know of no data that could cause this sort of scenario.
[37756] 11/23/17 10:13:02.718 DeviceIo: 00:02:01:00 - Refresh handle on "\\.\Tape1", SCSI cmd 16, new handle ffffffff, error 2
[37756] 11/23/17 10:13:02.718 DeviceIo: FindVanishedDevice: SwitchOver Adapter Info NULL for pathIde=2
[37756] 11/23/17 10:13:02.718 DeviceIo: Failed to find new device for "\\.\Tape1"
[37756] 11/23/17 10:13:02.718 DeviceIo: 00:02:01:00 - Refresh handle on "\\.\Tape1", SCSI cmd 1a, new handle ffffffff, error 2
[37756] 11/23/17 10:13:02.718 DeviceIo: FindVanishedDevice: SwitchOver Adapter Info NULL for pathIde=2
[37756] 11/23/17 10:13:02.718 DeviceIo: Failed to find new device for "\\.\Tape1"
[37756] 11/23/17 10:13:03.219 DeviceIo: 00:02:01:00 - Refresh handle on "\\.\Tape1", SCSI cmd 00, new handle ffffffff, error 2
[37756] 11/23/17 10:13:03.219 DeviceIo: FindVanishedDevice: SwitchOver Adapter Info NULL for pathIde=2
[37756] 11/23/17 10:13:03.219 DeviceIo: Failed to find new device for "\\.\Tape1"
[37756] 11/23/17 10:13:03.720 PvlDrive::DisableAccess() - ReserveDevice failed, offline device
Drive = 1012 "Bandlaufwerke 0002"
ERROR = 0x0000001F (ERROR_GEN_FAILURE)
[37756] 11/23/17 10:13:03.735 PvlDrive::UpdateOnlineState()
Drive = 1012 "Bandlaufwerke 0002"
ERROR = The device is offline!- bitformer7 years agoLevel 3
- i will check that mode as soon as possible. since the backup worked well until 2017/10/22 and the customer had no maintenance during that time i have no clue how the mode could have changed
- @pkh: i did a tape wipe + inventory before running a test job (single VM as Hyper-V backup) and the job terminated at exaclty 254GB as all the tests before with the same symptoms
- bitformer7 years agoLevel 3
835 - Smart HBA H240 in Steckplatz 4 befindet sich im HBA-Modus. Alle physischen Laufwerke, die an diesen Controller angeschlossen sind, sind direkt im Betriebssystem zugänglich.
- which translates to... HBA Mode is activated
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