resilver after drive replacement

[Jason Fayre]

Hello,
I just replaced one of the drives in my array after a drive failure.
My array has around 3TB of data stored on it. Each drive is 2tb. The resilvering process seems to have stopped at around 580G. Is this normal? The pool says it is online, not degraded.
Here is the output from zpool status:
pool: storage
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using ’zpool upgrade’. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(7) for details.
scan: resilvered 587G in 0 days 02:10:34 with 0 errors on Sun Apr 8 21:56:04 2018
config:
NAME STATE READ WRITE CKSUM
storage ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
gptid/e4482670-30cd-11e5-896d-d050995179a6 ONLINE 0 0 0
gptid/1c641cab-8e44-11e6-8fc1-d05099c1205d ONLINE 0 0 0
gptid/c4f6566b-cd3c-11e6-8ae5-d05099c1205d ONLINE 0 0 0
gptid/5b6dd178-ec39-11e4-8726-d050995179a6 ONLINE 0 0 0
gptid/b65c3f88-3b86-11e8-89d9-d05099c1205d ONLINE 0 0 0
errors: No known data errors

 

[Jason Fayre]

Sorry for the extreme newbie question. I think I just solved my own problem. 4x587 is the total storage on the pool. Clearly my brain isn't working today.