Server disk de-allocated itself - why?












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We had an emergency situation happen overnight last month. A virtualised server (Server 2008R2) running under VMWare 6.5 experienced its D drive disappearing and becoming 250GB of unallocated space. As this was the data drive for our SQL server this was quite an emergency. We eventually got all the data back via a program called Ease-US, but are at a total loss to figure out how it can have happened.
Nothing in the Windows, VEEAM, VMWare or SAN logs give any clues. There is no evidence of malware hitting master boot records either.



Any ideas what could have caused this?










share|improve this question























  • Is the failed disk still in the array? Have you checked the baremetal for disk issues?

    – Burgi
    Jan 2 at 16:47











  • You may have better luck asking this question at StackExchange Server Fault.

    – Matthew Valdez
    Jan 2 at 16:47











  • No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

    – Dave45
    Jan 3 at 10:48
















0















We had an emergency situation happen overnight last month. A virtualised server (Server 2008R2) running under VMWare 6.5 experienced its D drive disappearing and becoming 250GB of unallocated space. As this was the data drive for our SQL server this was quite an emergency. We eventually got all the data back via a program called Ease-US, but are at a total loss to figure out how it can have happened.
Nothing in the Windows, VEEAM, VMWare or SAN logs give any clues. There is no evidence of malware hitting master boot records either.



Any ideas what could have caused this?










share|improve this question























  • Is the failed disk still in the array? Have you checked the baremetal for disk issues?

    – Burgi
    Jan 2 at 16:47











  • You may have better luck asking this question at StackExchange Server Fault.

    – Matthew Valdez
    Jan 2 at 16:47











  • No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

    – Dave45
    Jan 3 at 10:48














0












0








0








We had an emergency situation happen overnight last month. A virtualised server (Server 2008R2) running under VMWare 6.5 experienced its D drive disappearing and becoming 250GB of unallocated space. As this was the data drive for our SQL server this was quite an emergency. We eventually got all the data back via a program called Ease-US, but are at a total loss to figure out how it can have happened.
Nothing in the Windows, VEEAM, VMWare or SAN logs give any clues. There is no evidence of malware hitting master boot records either.



Any ideas what could have caused this?










share|improve this question














We had an emergency situation happen overnight last month. A virtualised server (Server 2008R2) running under VMWare 6.5 experienced its D drive disappearing and becoming 250GB of unallocated space. As this was the data drive for our SQL server this was quite an emergency. We eventually got all the data back via a program called Ease-US, but are at a total loss to figure out how it can have happened.
Nothing in the Windows, VEEAM, VMWare or SAN logs give any clues. There is no evidence of malware hitting master boot records either.



Any ideas what could have caused this?







hard-drive partitioning






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Jan 2 at 16:20









Dave45Dave45

1012




1012













  • Is the failed disk still in the array? Have you checked the baremetal for disk issues?

    – Burgi
    Jan 2 at 16:47











  • You may have better luck asking this question at StackExchange Server Fault.

    – Matthew Valdez
    Jan 2 at 16:47











  • No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

    – Dave45
    Jan 3 at 10:48



















  • Is the failed disk still in the array? Have you checked the baremetal for disk issues?

    – Burgi
    Jan 2 at 16:47











  • You may have better luck asking this question at StackExchange Server Fault.

    – Matthew Valdez
    Jan 2 at 16:47











  • No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

    – Dave45
    Jan 3 at 10:48

















Is the failed disk still in the array? Have you checked the baremetal for disk issues?

– Burgi
Jan 2 at 16:47





Is the failed disk still in the array? Have you checked the baremetal for disk issues?

– Burgi
Jan 2 at 16:47













You may have better luck asking this question at StackExchange Server Fault.

– Matthew Valdez
Jan 2 at 16:47





You may have better luck asking this question at StackExchange Server Fault.

– Matthew Valdez
Jan 2 at 16:47













No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

– Dave45
Jan 3 at 10:48





No disk shows any sign of having actually failed - the baremetal SAN disks are all green and good.

– Dave45
Jan 3 at 10:48










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