HP LH4r Integrated HP NetRaid Controller Configuration Guide - Page 73

Expansion feature. SFT-3 mirrors disk storage on a partition

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Chapter 7 Preparing for Online Capacity Expansion installation occurs. As long as the physical capacity is not exceeded, the installation will be successful. Although undesirable, NetWare allows you to create volumes into the virtual space. (This is because during volume creation, NetWare only looks at the beginning of the volume and if there is real storage space there, the volume will be created.) However, when writing to this volume, you cannot write beyond the physical limit and write errors will be generated when the physical space is filled. You need to be careful when creating volumes in a partition containing virtual space. Use the HP NetRAID Config module to check the actual physical capacity available, and be sure the total size of NetWare volumes do not exceed this value. One other useful measure is to set the capacity alarms under NetWare so that warnings will be generated when you approach the limit of a volume. The Online Capacity Expansion feature cannot be used if a logical drive spans multiple arrays. Each array can contain only one logical drive. Reconstruction (for the purposes of adding a drive to an array) can be done only on an array having a single logical drive. It is also important to plan future storage expansion into your installation. This ensures that you can easily expand capacity without the need for backup/restore operations or reconfiguration. NOTE SFT-3 and mirroring users: Novell's operating system, which provides system level fault tolerance by mirroring two systems, is not compatible with the Online Capacity Expansion feature. SFT-3 mirrors disk storage on a partition basis rather than a volume basis. Because of the virtual space created within the partition, SFT-3 cannot successfully mirror the partitions. This limitation also applies to regular mirroring (without SFT-3) of volumes. SFT-3 users may add storage capacity online without bringing the two systems down if enough drives are added to create a new array and logical drive on an integrated HP NetRAID controller. Under the Install module, NetWare can then scan for new devices and detect the new logical drive. 67

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Chapter 7
Preparing for Online Capacity Expansion
67
installation occurs. As long as the physical capacity is not exceeded, the
installation will be successful.
Although undesirable, NetWare allows you to create volumes into the virtual
space. (This is because during volume creation, NetWare only looks at the
beginning of the volume and if there is real storage space there, the volume will
be created.) However, when writing to this volume, you cannot write beyond the
physical limit and write errors will be generated when the physical space is filled.
You need to be careful when creating volumes in a partition containing virtual
space. Use the HP NetRAID Config module to check the actual physical capacity
available, and be sure the total size of NetWare volumes do not exceed this value.
One other useful measure is to set the capacity alarms under NetWare so that
warnings will be generated when you approach the limit of a volume.
The Online Capacity Expansion feature cannot be used if a logical drive spans
multiple arrays. Each array can contain only one logical drive. Reconstruction
(for the purposes of adding a drive to an array) can be done only on an array
having a single logical drive. It is also important to plan future storage expansion
into your installation. This ensures that you can easily expand capacity without
the need for backup/restore operations or reconfiguration.
NOTE
SFT-3 and mirroring users:
Novell’s operating system,
which provides system level fault tolerance by mirroring two
systems, is not compatible with the Online Capacity
Expansion feature. SFT-3 mirrors disk storage on a partition
basis rather than a volume basis. Because of the virtual space
created within the partition, SFT-3 cannot successfully mirror
the partitions. This limitation also applies to regular mirroring
(without SFT-3) of volumes. SFT-3 users may add storage
capacity online without bringing the two systems down if
enough drives are added to create a new array and logical
drive on an integrated HP NetRAID controller. Under the
Install module, NetWare can then scan for new devices and
detect the new logical drive.