Buffalo ISCSI Gebrauchsanweisung

Best Practices for running Buffalo

Technology iSCSI platforms on VMware

vSphere

Summary of steps you should take to insure that you have a trouble free setup:

• Make sure that you have unique names for all your LUN’s. This is required if you have more than

one iSCSI unit or the additional LUN’s will not be re ognized by ESX.

• For ea h LUN that you make, set the Maximum Conne tions field in Advan ed Settings to the

total number of ESX servers that will be atta hed to the LUN. Example: For 5 servers, set

Maximum Conne tions to 5.

• Make all of your arrays’ LVM/LUN onfigurations in the TeraStation before atta hing them to

your ESX server. On e they are made, you annot hange them due to a limitation in the

urrent firmware 1.32 / 1.40. Making a hange after onne ting to the ESX server requires

rebuilding the arrays and losing all data.

• Our iSCSI units are best onne ted to your environment with only LAN 1 plugged into your

swit h. Do not use LAN 2 as your only onne tion to the host server. Our units do not support a

network failover onfiguration.

• Before making hanges to your iSCSI TS’s settings, first stop the iSCSI servi e in the TeraStation

Web Administrator interfa e. Do not stop the iSCSI servi e if the unit is a tively being used with

your ESX server.

• Change the time zone to your lo al zone.

Simple Configuration (one ESX server and one TS III iSCSI of 4 TB apa ity or

less)

Requirements:

OS: VMware ESX 4.0, 4.1

iSCSI Firmware: 1.32 or greater

Re ommend array onfigurations:

These are the most ommon ways to set up a unit with 4 TB or less of spa e.

Raw Capacity RAID Level Number of Arrays

2 TB 5 1

0 1 or 2

1 1 or 2

4 TB 5 1

0 1 or 2

1 1 or 2

Note: Max 4 TB unit / No LVM (If you need more than two LUNs use omplex onfiguration)

The simple onfiguration method is easy to use and qui k to onfigure. When you take the unit out of

the box, onfigure it before onne ting it to the VMware ESX server.

1. Make sure that the iSCSI Servi e is turned off.

2. Set the time to your time zone. NPT is re ommended.

3. Hook up your UPS and onfigure it under Maintenan e -> Power Management

4. VMware allows a maximum 2 TB LUN size, so remember this when you de ide what disk and

volume layout you want.

5. When all onfigurations are finished, turn the iSCSI Servi e ba k on.

Complex Configuration (two or more ESX servers or a TS III iSCSI with apa ity

greater than 4 TB)

Requirements:

OS: VMware ESX/ESXi 4.0, 4.1

iSCSI Firmware: 1.32 or greater

Re ommend array onfigurations:

These are the most ommon ways to set up a unit with 6 TB or more of spa e.

Raw Capacity RAID Level Number of Arrays

6 TB 5 1

0 1 or 2

1 2

8 TB 5 1

0 1 or 2

1 2

Note: For 6 TB or larger you must use LVM.

Starting up a system su h as this will take more onfiguration than our simple setup. When you take the

units out of the box, onfigure them before you onne t them to the VMware servers.

1. Make sure that the iSCSI Servi e is turned off.

2. Set the time to your time zone.

3. Hook up your UPS and onfigure it in Maintenan e -> Power Management.

4. Turn on the Logi al Volume Manager.

5. Add your volumes. Please keep in mind these few points when you are making ea h volume:

a. Make sure that ea h volume name is unique a ross all iSCSI units in your environment.

b. In advan ed settings set to the number of servers you will be atta hing these units to in

the field “Max Conne tions”. The maximum number of servers that an be atta hed is

16.

. Keep in mind that you are only allowed 32 Logi al Volumes on the unit.

d. VMware allows a maximum 2 TB LUN size, so remember this when you de ide what disk

and volume layout you want.

6. After onfiguration is finished, turn the iSCSI Servi e ba k on.

Notes:

o Power up and power down sequen e:

 Please make sure that you power on the iSCSI units first before the ESX servers.

 When powering down, shut down the ESX server first, then the iSCSI TS III units.

 Never dis onne t the LAN able while the system is a tive.

o Buffalo Te hnology strongly re ommends onne ting your iSCSI TeraStation to UPS

power. We re ommend the APC Smart-UPS models. Runtime should be onfigured to

ex eed the runtime of the ESX server to prevent the storage array powering down

before the server.

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