Dell PowerVault MD3260i Series Handbuch zur Fehlersuche - Seite 16

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Dell PowerVault MD3260i Series Handbuch zur Fehlersuche

Using more than one NIC on the

same subnet

Using Ethernet Jumbo frames

(larger than 1500 bytes)

Check that you can ping all iSCSI host ports from the

attached host server. Multiple NICs configured on the

same subnet cannot complete a ping command

because the default NIC originating the ping command

may not have a path to the target IP address being

pinged.

On Windows-based hosts, use the -S parameter to

specify the source and target IP addresses on the RAID

controller:

ping 192.168.130.101 –S 192.168.130.102

On Linux-based hosts, use the -I parameter to specify

the target IP address from the

ping –I eth0 192.168.130.101

NOTES:

You should be able to successfully ping

multiple NICs on different subnets. However, if

each NIC is on the same subnet, you must map

each iSCSI port manually via the host server

iSCSI initiator.

Make sure Enable ICMP PING responses is

selected in the MD Storage Manager Configure

iSCSI Host Ports window

Check your firewall settings to make sure that

ICMP ping packets are not blocked internally

If you are using Ethernet frames with a maximum

transmission unit (MTU) of more than 1500 bytes, they

are considered Jumbo frames. The MD-series storage

array supports MTU sizes of up to 9000 bytes.

However, you should tune your maximum MTU size

based on the application and drivers used in your

configuration. Smaller MTU sizes may yield better

overall data throughput.

1. Verify that Jumbo frames are set to Enabled

for all network components (switches, NICs

and the storage array).

2. Ensure that the same MTU size is set on all

components. If unequal sizes are set on host

and target, the smallest setting will be used.

The switch may fragment any frame that is

larger than its set MTU size.

3. After setting the proper sizes, verify network

interface:

eth0