Performing Common Tasks
Consider the following scenarios:
Scenario 1:
The array consists of three 1 GB drives. You assign RAID level
0 (which uses all the drives in the array with no parity storage),
and type
1ðððMB
. The number in the Size (MB) field will be 999,
which is the number closest to and lower than 1000 that is
divisible by 3.
Scenario 2:
The array consists of three 1 GB drives. You assign RAID level
1, which provides a disk mirroring that stripes data across all
drives in the array. Because the data is mirrored, the capacity of
the logical drive is 50 per cent of the physical capacity of the
hard disk drives grouped in the array. Type
1ðððMB
; the
number in the Size (MB) field will be 999. The physical capacity
used is 2000 MB, twice that of the logical drive size. The
number that is closest to or lower than 2000 is divisible by 3 is
1998. The logical drive size is 999, which is 50% of the physical
capacity.
Scenario 3:
The array consists of three 1 GB drives, and you assign RAID
level 5. Data is striped across all three drives in the array, but
the space equivalent to that of one drive is used for redundant
storage. Therefore, if you type
1ðððMB
, the number in the Size
(MB) field remains 1000 because it is divisible by 2 (drives),
which is the space available for data.
If you do not use the entire array for this logical drive, you can
create another by assigning either the same or a different RAID
level for an additional logical drive. You can have as many as
eight logical drives among eight disk arrays.
6. To return to the Create/Delete Array menu, press Esc. To
define more logical drives, repeat steps 1 through 5 of this
procedure.
7. To leave this screen, select Exit or press Esc. A pop-up window
appears asking you to confirm your action.
8. To save your changes, select Yes. To maintain the disk-array
configuration that was in place before you made changes, select
No
.
90
PC Server 520 User's Handbook for PCI/Micro Channel
Summary of Contents for PC Server 520
Page 1: ...PC Server 520 User s Handbook for PCI Micro Channel IBM...
Page 86: ...Installation Checklist 70 PC Server 520 User s Handbook for PCI Micro Channel...
Page 146: ...Using the Mini Configuration Program 130 PC Server 520 User s Handbook for PCI Micro Channel...
Page 190: ...Using the SCSISelect Utility Program 174 PC Server 520 User s Handbook for PCI Micro Channel...
Page 385: ...Installing Additional Test Programs 207 CMD 3 Chapter 7 Solving Problems 369...
Page 438: ...IBM Part Number 78H6336 Printed in U S A May 1996 78H6336...
