IBM DS8000 - Manual (Page 223)

Chapter 10. The DS Storage Manager - logical configuration 201
Figure 10-8 Diagram of how parity is striped across physical disks
Rank layer
At this level the ranks are formed. Presently only one array can make up a rank.
Extent pool layer
At this level the extent pools are formed. In Figure 10-7 we show that extent pool A is made
up of 2 ranks: rank 1 and rank 2. The extents in the pool are 1GB.
Logical volume layer
Layer 6 is the final level of the LUN formation. As illustrated in Figure 10-7, two LUNs were
created out of extent pool A. The top LUN is made up of 12 extents, making it a 12 GB LUN.
The bottom LUN is made up of 24 extents, making it a 24 GB LUN.
Logical Configuration flow
Figure 10-9 on page 202 shows the recommended flow for performing the Logical
Configuration using the GUI.
Sp
are
Chunk1
Chunk2
Chunk3
Chunk4
Chunk5
Chunk6
Parity
Chunk1
Chunk2
Chunk3
Chunk4
Chunk5
Parity
Chunk7
Chunk1
Chunk2
Chunk3
Chunk4
Parity
Chunk6
Chunk7
Chunk1
Chunk2
Chunk3
Parity
Chunk5
Chunk6
Chunk7
Chunk1
Chunk2
Parity
Chunk4
Chunk5
Chunk6
Chunk7
Chunk1
Paity
Chunk3
Chunk4
Chunk5
Chunk6
Chunk7
Parity
Chunk2
Chunk3
Chunk4
Chunk5
Chunk6
Chunk7