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Logical Volume

This column indicates the name of the volume to which the partition

belongs, if any.

To select a partition, you must first select the disk on which it exists.

With the desired disk selected, press the 'Tab' key, and a selection bar

will appear in the disk partition list, allowing you to select partitions

using the up and down arrow keys. To return focus to the disk list,

press the 'Tab' key again.

Pressing 'Enter' when a partition is selected will cause the disk

partition options menu to appear.

Creating an installable volume

In order to install eComStation, you need to have at least one empty,

visible compatibility volume available on your hard disk.

If you do not already have a suitable volume ready to install

eComStation, you will need to create one.

Creating a volume may seem like a complicated procedure. To a

certain extent, it is. Managing hard disk partitions is not a trivial task

under any circumstances, and the fact that volume management offers

many powerful features unavoidably adds to the potential complexity.

Note: If you have already created an empty volume for the purpose of

installing eComStation (or from a preview installation), then you

should not need to create another one.

Tip: An excellent step by step guide is available in the online help

during installation, please consult it if you need to perform harddisk or

partition management. You can also view this document directly from

CD from the directory: \ecs\books\lvmhelp.inf

Appendix C: Logical Volume Manager 45

General Considerations

Make sure you have your harddisk layout the way you want it, before

you install eComStation. The use of partitioning tools, like

PartitionMagic of PowerQuest, FIPS, or others should be prevented if at

all possible after you have installed eComStation.

Under eComStation, instead of using standard disk partitions to arrange

your hard disks into logical drives, you use volumes.

Note: the eComStation Preview and the IBM MCP installer use a tool

to automatically "tag" all available partitions with a LVM "fingerprint". A

compatibility volume is simply a partition which has been tagged in

this way. The fingerprint is used by LVM to store extra information

specific to volume management. This tool is called Volume

Conversion Utility (VCU) and is known to cause trouble on some

configurations. That is why the eComStation installer does not invoke

this tool automatically. This requires that you create the volumes

yourself with LVM.

Operating systems which do not "understand" logical volumes will

simply continue to treat compatibility volumes as partitions in the

traditional sense.

However, if non-LVM-aware software which performs partition-level disk

management is used, then this "fingerprint" may be inadvertently

erased. Such programs include the "FDISK" utilities from most other

operating systems, and also software such as Partition Magic from

PowerQuest. For this reason, it is strongly recommended that you do

not use such software on your system after installing eComStation.

If you must do so, then please read the following information carefully

first.

If your system does not contain any special "LVM volumes" (as opposed

to simple compatibility volumes), then the use of such programs is not

likely to cause permanent data loss. In all probability, however,

eComStation will not be able to boot from the affected disk drive until

the LVM "fingerprints" are recreated. To do this, it will be necessary to

boot the system off the eComStation CD-ROM or recovery diskettes,

run LVM, and manually convert the partitions back into volumes. Once

this has been done, your volumes should be fully restored and

functional, with no loss of data.

46 eComStation Manual

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