Novell LINUX ENTERPRISE SERVER 10 SP3 - ARCHITECTURE-SPECIFIC, Руководство администратора, Страница: 36 / 132

36 SLES 10 SP3: Storage Administration Guide
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4.1.2 Disk Segments
After you initialize the disk by adding a segment manager, you see metadata and free space
segments on the disk. You can then create one or multiple data segments in a disk segment.
Table 4-2
Disk Segment Types
4.2 Initializing Disks
You must initialize new disks and disks that you want to reformat. After the disk is initialized, you
can subdivide, or carve, the device into one or more disk segments for your file systems.
Š
Section 4.2.1, “Before You Begin,” on page 36
Š
Section 4.2.2, “Guidelines,” on page 37
Š
Section 4.2.3, “Adding a Segment Manager,” on page 37
4.2.1 Before You Begin
If you use large disks or disk arrays, use the vendor’s tools to carve them into the sizes that are
usable for the management tools you plan to use. For example, the
md
driver recognizes disks only
up to 2 TB in size, so the limit also applies to the
md
plug-in for EVMS. Software RAID devices you
create with EVMS can be larger than 2 TB, of course, because the
md
driver plug-in manages the
disks underneath that storage structure.
When you boot the server, EVMS scans and recognizes all devices it manages. If you add a new
device to the server or create a device using
mkfs
, EVMS automatically mounts it on reboot under
/
dev/evms
as a compatibility volume, such as
/dev/evms/sdb
.
IMPORTANT: If you cannot find a new disk, device, or volume, look under
/dev/evms
in a file
browser, or look for compatibility volumes in the Volumes Manager in the EVMS GUI (
evmsgui
).
MAC A partitioning scheme for Mac-OS partitions.
Segment Type Description
Metadata A set of contiguous sectors that contain information needed by the segment
manager.
Free Space A set of contiguous sectors that are unallocated or not in use. Free space can
be used to create a segment.
Data A set of contiguous sectors that has been allocated from a disk. The segment
might be in use for a volume or a software RAID.
Segment Manager Description