gwr commented on this pull request.
> @@ -54,6 +55,12 @@ struct uberblock {
/* highest SPA_VERSION supported by software that wrote this txg */
uint64_t ub_software_version;
+
+ /* These fields are reserved for features that are under development: */
+ uint64_t ub_mmp_magic;
+ uint64_t ub_mmp_delay;
[ Copying a question here I posted in the RTI forum. ]
I'm not normally at this depth in ZFS, so let me ask:
How do we know this works with older on-disk data?
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