From what I've read, Fusion drive will first fill up the SSD, except for 4gb.
Then, all data passes first to the SSD (within the 4gb buffer) before some data is moved to the non-SSD drive to free up data.
It seems like this could cause excessive wear on the SSD in two ways:
1. All data has to pass on through the SSD first (even if it won't ultimately live there, like big movie files and rarely accessed stuff).
2. If the SSD is kept mostly full, isn't that bad for the SSD in terms of wear-leveling and endurance and so forth?
(P.S. I just upgraded my Mac Mini, with 1tb conventional drive and a Samsung 840 Pro 512gb SSD. When I restarted from the recovery mode, Disk Utility gave me an option to erase my drives and convert to Fusion Drive! But I am wondering, wouldn't Fusion drive increase wear on the SSD?)
Then, all data passes first to the SSD (within the 4gb buffer) before some data is moved to the non-SSD drive to free up data.
It seems like this could cause excessive wear on the SSD in two ways:
1. All data has to pass on through the SSD first (even if it won't ultimately live there, like big movie files and rarely accessed stuff).
2. If the SSD is kept mostly full, isn't that bad for the SSD in terms of wear-leveling and endurance and so forth?
(P.S. I just upgraded my Mac Mini, with 1tb conventional drive and a Samsung 840 Pro 512gb SSD. When I restarted from the recovery mode, Disk Utility gave me an option to erase my drives and convert to Fusion Drive! But I am wondering, wouldn't Fusion drive increase wear on the SSD?)