Posts Tagged ‘iscsi’

Recently on testing an MSA serving iSCSI hosts after modifying the MTU size to varying amounts to tests throughput of a hyper V host our SNMP monitoring system detected hundreds of Inbound Errors and 10’s of discard.

To resolve this reversal was performed on the SAN to disable Jumbo frames and to change he MTU size on the Switch and the Networks cards, however this errors still displayed on the SAN Eth 0-2 ports and did nothing to resolve this. In the end we had to restart each of the storage controllers ( A and B )  to resolve this

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Use this command on the host to check for Power-On Reset Errors

grep vob.scsi.scsi.scsipath.por /var/log/vobd.log

e.g.

Note – ESXi uses UTC for its timezone so minus 5 hours to match EST

These should corrolate with Event log

Source multiple Errors/ Disk and LSI_SAS

“need to be taken offline to perform a Full Chkdsk”

Resolution

Migrate machine to new host to still see it happens and update all firmware and Vmware version before Vmware Support tell you to! 

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Configuration:

Disable DCB:

enable
configure
no dcb enable
exit

Configure out of band management port:

enable
configure
interface out-of-band
ip address X.X.X.X /24 192.168.1.1
exit

Http and telnet authentication:

enable
config
line telnet
login authentication default
exit
ip http authentication local

SSH keygen and enable

configure
crypto key generate rsa
crypto key generate dsa
ip ssh server

Configure login credentials:

username admin password yourpassword privilege 15
enable password yourpassword

Enable iSCSI optimization feature:

configure
iscsi enable
Are you sure you want to continue? y
exit

Configure flow control:

configure
flowcontrol
Are you sure you want to continue? y

Configure Jumbo MTU for all ports:

configure
system jumbo mtu 9216
exit

Configure spanning tree portfast on edge ports:

configure
interface range tengigabitethernet all
spanning-tree portfast
exit

Configure QSFP ports for LAG:

interface range yourports
no spanning-tree portfast
channel-group 1 mode active
exit

Save Configuration:

copy running-config startup-config

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