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How to replace a HDD in a Storage Spaces mirror without compromising redundancy?

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2

If I have two physical hard drives in a Storage Spaces pool and a 2-way mirrored virtual disk on them, how can I replace one HDD with a new (larger) one, without at any point having only a single copy of data?

A naive plan would be:

Starting point: two drives: hd0 and hd1

• add new HDD (hd2)


• copy data from either old HDD to hd2


• remove hd0


• optional cleanup


• result: hd1 and hd2 have mirrored data

But Storage Spaces seem to work in other direction:

• add new HDD (hd2)


• remove hd0 from mirror (or entire pool actually)


• at this point there is no more redundancy, if hd1 fails, the volume is lost


• copy data from hd1 HDD to hd2 (rebuild/repair)


• result: hd1 and hd2 have mirrored data

Is there a way to do this without having at any point only one copy of data?
(besides the obvious "backup and restore", which I expect to be much slower than a single copy operation between hard drives)

OS: Windows 2012R2

windows windows-server-2012-r2 storage-spaces

share|improve this question

edited Apr 8 at 12:20

David Balažic

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  are the hd1 and hd2 same capacity? Why do you think that backups will take more time than simple copy? What if something happened with the entire SATA/SAS controller? In any case, make a backup (you are not forced to use them, but just to keep your data safe). The easiest way will be adding a new disk to Storage Pool and then removing the old one and let storage space make a rebuild.
  
  – Strepsils
  Apr 8 at 7:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  hd2 is bigger. Backup + restore > one copy. Same as if it happened before the operation in question. I already have backup. That is exactly what I described in the question.
  
  – David Balažic
  Apr 8 at 11:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Additionally to the first comment: Storage Spaces FAQ - How do I replace a physical disk?
  
  – Freddy
  Apr 8 at 13:06
  

  
  
  
  

add a comment | 

2

If I have two physical hard drives in a Storage Spaces pool and a 2-way mirrored virtual disk on them, how can I replace one HDD with a new (larger) one, without at any point having only a single copy of data?

A naive plan would be:

Starting point: two drives: hd0 and hd1

• add new HDD (hd2)


• copy data from either old HDD to hd2


• remove hd0


• optional cleanup


• result: hd1 and hd2 have mirrored data

But Storage Spaces seem to work in other direction:

• add new HDD (hd2)


• remove hd0 from mirror (or entire pool actually)


• at this point there is no more redundancy, if hd1 fails, the volume is lost


• copy data from hd1 HDD to hd2 (rebuild/repair)


• result: hd1 and hd2 have mirrored data

Is there a way to do this without having at any point only one copy of data?
(besides the obvious "backup and restore", which I expect to be much slower than a single copy operation between hard drives)

OS: Windows 2012R2

windows windows-server-2012-r2 storage-spaces

share|improve this question

edited Apr 8 at 12:20

David Balažic

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  are the hd1 and hd2 same capacity? Why do you think that backups will take more time than simple copy? What if something happened with the entire SATA/SAS controller? In any case, make a backup (you are not forced to use them, but just to keep your data safe). The easiest way will be adding a new disk to Storage Pool and then removing the old one and let storage space make a rebuild.
  
  – Strepsils
  Apr 8 at 7:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  hd2 is bigger. Backup + restore > one copy. Same as if it happened before the operation in question. I already have backup. That is exactly what I described in the question.
  
  – David Balažic
  Apr 8 at 11:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Additionally to the first comment: Storage Spaces FAQ - How do I replace a physical disk?
  
  – Freddy
  Apr 8 at 13:06
  

  
  
  
  

add a comment | 

If I have two physical hard drives in a Storage Spaces pool and a 2-way mirrored virtual disk on them, how can I replace one HDD with a new (larger) one, without at any point having only a single copy of data?

A naive plan would be:

Starting point: two drives: hd0 and hd1

• add new HDD (hd2)


• copy data from either old HDD to hd2


• remove hd0


• optional cleanup


• result: hd1 and hd2 have mirrored data

But Storage Spaces seem to work in other direction:

• add new HDD (hd2)


• remove hd0 from mirror (or entire pool actually)


• at this point there is no more redundancy, if hd1 fails, the volume is lost


• copy data from hd1 HDD to hd2 (rebuild/repair)


• result: hd1 and hd2 have mirrored data

Is there a way to do this without having at any point only one copy of data?
(besides the obvious "backup and restore", which I expect to be much slower than a single copy operation between hard drives)

OS: Windows 2012R2

windows windows-server-2012-r2 storage-spaces

share|improve this question

edited Apr 8 at 12:20

David Balažic

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

share|improve this question

edited Apr 8 at 12:20

David Balažic

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

share|improve this question

edited Apr 8 at 12:20

David Balažic

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211

asked Apr 7 at 19:44

David BalažicDavid Balažic

220211