No. only about half the ports… with two ports going to HBA.
I started last night copying files off the zvol as a backup so I can blow away the pool and create it again with ashift=12…
random thought…
I wish I had a motherboard with more PCIe slots so I could install my other sas hba and use multipathd with my sas expander…
after destroying the zvol and creating a new one without dedup… i confirmed that the slowness is on the backup array side. The restore is moving at the same speed regardless of dedup on or off.
cpu %(green) and wait % (blue) - dedup on - left
cpu %(green) and wait % (blue) - dedup off - right
…same scale…
You must use the whole disk if you want full performance.
/dev/sda
You’ll notice, later on, that ZFS creates two partitions. One is data, one is pool metadata, I think. They’re aligned properly by the util. It’s a bit complicated and I don’t know all the details, but essentially if you just use the raw disk, you don’t have to worry.