I have 2 outstanding review requests that I could use feedback on. These have been open for quite a while so I'm probably going to RTI them this weekend.
Provide mechanism to artificially limit disk performance https://github.com/openzfs/openzfs/pull/39 This patch hijacks the existing 'zinject -D MSECS -d GUID' command, slightly modifying it's interface and behavior to allow a user to set per disk target latencies for IO requests. This is useful when trying to run performance tests, and/or make performance critical changes, but need to rule out the normal variance of hard drives. Using this facility, the user can configure a disk to complete each IO request in a configurable amount of time while also configuring the number of 'lanes' of the device (i.e. the number concurrent IO requests possible). For example, the following will configure the disk to complete each IO 6370 ZFS send fails to transmit some holes https://github.com/openzfs/openzfs/pull/37 In certain circumstances, "zfs send -i" (incremental send) can produce a stream which will result in incorrect sparse file contents on the target.
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