Help! FreeNAS NFS connections causing ESXI/AIX to timeout and be unresponsive

[darthvaper]

Hi guys, i recently inherited a zfs san running on a super micro, during backup hours when there's IO on the san, the connection will timeout and be unresponsive.
I've ran gstat on the san and i see that ada0 and ada1 are at 90-100% busy while my other disks are at 10-20% and then randomly spike up to 90%.
I've also noticed that only one of the nfs shares are failing to mount on my AIX systems
Is there anything thing i can run to check what's killing my san
Any help would be greatly appreciated, thank you

 

[dlavigne]

Please provide the information requested by the forum rules. To assist we'll need at a minimum, the exact FreeNAS version, hardware specs, and any error messages in /var/log/messages.

 

[darthvaper]

it's running on a supermicro server
256G of ram
32 x 4TB SATA disk
2 Raidz2 pools
FreeNAS-9.3-STABLE-201602031011

CPU: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz (2100.04-MHz K8-class CPU)

/var/log/messages
Jun 25 13:25:29 san-zfs-02 python: mdns: Failed to initialise lookup, error -65563
Jun 25 13:26:28 san-zfs-02 kinit: mdns: Failed to initialise lookup, error -65563
Jun 25 13:27:06 san-zfs-02 net: mdns: Failed to initialise lookup, error -65563
Jun 25 13:27:54 san-zfs-02 winbindd[8305]: mdns: Failed to initialise lookup, error -65563
Jun 25 13:26:50 san-zfs-02 python: mdns: Failed to initialise lookup, error -65563

 

[dlavigne]

Were you able to resolve this?