Need sanity check on reconfiguring ZIL

[taupehat]

Right now "zpool status" is griping about non-native block size for the logs device. Here's the bit that matters:

Code:

  logs
  mirror-5  ONLINE  0  0  0
  gpt/log0  ONLINE  0  0  0  block size: 512B configured, 4096B native
  gpt/log1  ONLINE  0  0  0  block size: 512B configured, 4096B native

As I understand it, the right solution is to delete and recreate mirror-5 with the correct block size. From what I've seen this is safe so long as the zpool version is higher than 15, zpool upgrade -v returns "This system supports ZFS pool feature flags." and no version number. Which of the feature flags do I need to see enabled in order to safely remove and replace the ZIL?

Any further tips or warnings greatly appreciated.

 

[m0nkey_]

Did you use the CLI to create the mirror? If so, that's the problem. Destroy the mirror and re-create it using the GUI.

 

[taupehat]

Did you use the CLI to create the mirror? If so, that's the problem. Destroy the mirror and re-create it using the GUI.

Right. But is it safe to destroy that mirror? Feature flags and all that.

 

[Arwen]

Yes. It is safe to destroy the SLOG mirror.

Any pool with feature flags begins at legacy version 28.
Thus, greater than the pool version 15 required.