I know enough about zfs/freenas to get myself into trouble. I am very aware of SSD zils/l2arcs and getting the right type of ssd for the job, and how much it can improve our VMware env. We run several SSD ZILs on our various pools and they are a must-have for sync=always, like our ESX env does.
We've just put some very fast PCIe SSDs from Intel (750) into production, and I'm wondering if it's worth dedicating the hardware (and more importantly, the SATA channels) at doing zil/l2arc.
Has anyone tested it both ways extensively? Our lab setup isn't quite nice enough to really figure it out, and I don't want/cant keep our production box down long enough to get some meaningful data. We don't have enough PCIe slots, our sata SSDs are consumer grade, and we don't have 10gbE in our lab.
In theory, SSD zil/l2arc speeds up platter-based vdevs considerably. Does it help at all when your vdev is Faster Than Piss? In our case (due to limited PCIe lanes) putting in a zil/l2arc would actually occur on our SATA backplane and probably be SLOWER than the 750s.
I am just not sure if the method of caching and writing would benefit us still, or it would be a wash, or a performance loss.
We've just put some very fast PCIe SSDs from Intel (750) into production, and I'm wondering if it's worth dedicating the hardware (and more importantly, the SATA channels) at doing zil/l2arc.
Has anyone tested it both ways extensively? Our lab setup isn't quite nice enough to really figure it out, and I don't want/cant keep our production box down long enough to get some meaningful data. We don't have enough PCIe slots, our sata SSDs are consumer grade, and we don't have 10gbE in our lab.
In theory, SSD zil/l2arc speeds up platter-based vdevs considerably. Does it help at all when your vdev is Faster Than Piss? In our case (due to limited PCIe lanes) putting in a zil/l2arc would actually occur on our SATA backplane and probably be SLOWER than the 750s.
I am just not sure if the method of caching and writing would benefit us still, or it would be a wash, or a performance loss.