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How do ZFS snapshots work and how would I implement a retention policy similar to OpenSolaris'?

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1

I've been using ZFS for a while and have snapshots piling up.

I believe I can start deleting the old snapshots, but want to be doubly sure. A ZFS snapshot would be essentially similar to a git tag where it is a read-only reference to a point in time version of the repository. The active data set would be HEAD and would remain unaffected if I delete a pointer to that point in time?

So, if that is the case, then if I want to have a 30-day retention policy, I can merely look at the creation date for the snapshot and discard anything > 30 days?

Are those assumptions accurate?

Thanks,

Walter

zfs zfsonlinux

share|improve this question

edited May 19 at 1:38

Walter

asked May 18 at 22:30

WalterWalter

1135

add a comment | 

1

I've been using ZFS for a while and have snapshots piling up.

I believe I can start deleting the old snapshots, but want to be doubly sure. A ZFS snapshot would be essentially similar to a git tag where it is a read-only reference to a point in time version of the repository. The active data set would be HEAD and would remain unaffected if I delete a pointer to that point in time?

So, if that is the case, then if I want to have a 30-day retention policy, I can merely look at the creation date for the snapshot and discard anything > 30 days?

Are those assumptions accurate?

Thanks,

Walter

zfs zfsonlinux

share|improve this question

edited May 19 at 1:38

Walter

asked May 18 at 22:30

WalterWalter

1135

add a comment | 

I've been using ZFS for a while and have snapshots piling up.

I believe I can start deleting the old snapshots, but want to be doubly sure. A ZFS snapshot would be essentially similar to a git tag where it is a read-only reference to a point in time version of the repository. The active data set would be HEAD and would remain unaffected if I delete a pointer to that point in time?

So, if that is the case, then if I want to have a 30-day retention policy, I can merely look at the creation date for the snapshot and discard anything > 30 days?

Are those assumptions accurate?

Thanks,

Walter

zfs zfsonlinux

share|improve this question

edited May 19 at 1:38

Walter

asked May 18 at 22:30

WalterWalter

1135

share|improve this question

edited May 19 at 1:38

Walter

asked May 18 at 22:30

WalterWalter

1135

share|improve this question

edited May 19 at 1:38

Walter

asked May 18 at 22:30

WalterWalter

1135

asked May 18 at 22:30

WalterWalter

1135

asked May 18 at 22:30

WalterWalter

1135

1 Answer
1

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oldest

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2

That's pretty accurate.

Consider using the sanoid tool to automate the creation and destruction of such snapshots on whatever schedule you desire.

share|improve this answer

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, I will have to checkout the sanoid project.
  
  – Walter
  May 19 at 1:37
  

  
  
  
  

add a comment | 

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2

That's pretty accurate.

Consider using the sanoid tool to automate the creation and destruction of such snapshots on whatever schedule you desire.

share|improve this answer

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, I will have to checkout the sanoid project.
  
  – Walter
  May 19 at 1:37
  

  
  
  
  

add a comment | 

2

That's pretty accurate.

Consider using the sanoid tool to automate the creation and destruction of such snapshots on whatever schedule you desire.

share|improve this answer

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks, I will have to checkout the sanoid project.
  
  – Walter
  May 19 at 1:37
  

  
  
  
  

add a comment | 

That's pretty accurate.

Consider using the sanoid tool to automate the creation and destruction of such snapshots on whatever schedule you desire.

share|improve this answer

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

share|improve this answer

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659

answered May 18 at 23:33

Michael Hampton♦Michael Hampton

179k27326659