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Forum Discussion
iSCSI performance
I have read different threads in the forums about iSCSI performance woes. I just wanted to post my own experience just recently, in the hopes it may add a data point to this and perhaps help me under...
Are you using thick LUNs with bit-rot protection and snapshots disabled?
Sorry for the late response! Well, I was using both thick and thin LUNs (called out in original post). I did not enable bitrot protection, because I'd presume COW would just slow things down. Indeed, I don't even run VMs normally (in my Linux environments where I use btrfs) from paths with COW enabled.
Thick LUNs are best for VMs. Yes, leaving bit-rot protection disabled is best as well.
Well, that's the counter-intutive part. I was eventually comparing a thick iSCSI LUN (no COW) and a thin-provisioned VDI (file) hosted on a CIFS share (a share *with* COW) and still the VDI thoroughly outperformed the iSCSI LUN. That's what gave rise to me wondering what it was about iSCSI that sucked so much.
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