XigmaNAS

Hi All.
For two years im running zfs and iscsi with version 9.1xx on a Dell R720 which served database via iscsi.
Its replicated nvia zfs send to a same hardware.

The servers have a small mirror disks for the nas4free and 12 4tb drives as hardware raid 6 acting as zfs pool.

In the last month i had 4 faulty 4tb drives.
In the last faulty drive dell asked to upgrade the firmware and bios of the server before replacing it.
THIS WAS A MISTAKE PROBABLY.
After the upgrade the nas4free has panic at boot.
I have reinstalled it without the large disks restored the configuration and once i have added the large drive boom panic. (without the zfa disks it boots)
I have installed a new version 9.3 and the data is there no panic.
But the performance is sucksssss.
Usually the server read the data at 40MB+ (looking at the server and the network util and also zpool iostat on the nas4free).
After the new os i was forced to upgrade im seeing 30MB read on the freenas but only 2 to 3MB on the server and network.

I have asked. Dell to replace the raid card and the backplane disks and all is the same.

The second storage works great.

I have no idea what do next?
Please share your thoughts.

Thanks in advanced
David

And i posted in zfs beacuse i assume its a zfs issue.

12 4tb drives as hardware raid 6 acting as zfs pool.

how did you configure this? hardware RAID 6 and ZFS pool seems contra productive, as the sytem needs direct access to the disks without a HW RAID layer inbetween.

Its replicated nvia zfs send to a same hardware

you may clone the system from your backup machine and check if it works better again

and first you should go through this http://n4f.siftusystems.com/index.php/2 ... /comments/
to identify the bottleneck.

Thanka Crowi.
I appreciate your response.
I have no time to replicate this its 20TB.
Forgot to say writes working perfect rate above 300MB.
Thanks
David

Downgrading the firmware of raid dell mini p710 made a great improvement. But for some reason the zfs iostat is double then the netwrok throughput.
It wasn't like this in the past. All the activity ia one server that reads with iscsi.