jgreco
Resident Grinch
- Joined
- May 29, 2011
- Messages
- 18,680
Yes, if you're sharing a SSD for SLOG and L2ARC, that works out to being a real bad idea.
Conspicuously missing from this discussion is any mention of what sort of workload you are designing this to handle. If you have a legitimate need for a SLOG device, dedicate one of your SSD's to the task. Use the manufacturer's tool to reset it to factory defaults, clearing all the data, then make a small partition for SLOG. This can potentially help the wear leveling algorithms in the SSD understand your usage model and maintain a larger pool of free pages, which translates to more joy. The other SSD will still help out your pool, but the pool has enough vdevs in it that it should be pretty fast.
Conspicuously missing from this discussion is any mention of what sort of workload you are designing this to handle. If you have a legitimate need for a SLOG device, dedicate one of your SSD's to the task. Use the manufacturer's tool to reset it to factory defaults, clearing all the data, then make a small partition for SLOG. This can potentially help the wear leveling algorithms in the SSD understand your usage model and maintain a larger pool of free pages, which translates to more joy. The other SSD will still help out your pool, but the pool has enough vdevs in it that it should be pretty fast.