SANRAD V-Switch manual Creating a Striped Volume, Volume create stripe, Stripe1, Sus, 100

The V-Switch supports a maximum of 512 volumes.

Creating a Striped Volume

A striped volume has data written equitably across two or more disks to provide higher read/write rates. Subdisks within a striped volume need to be on different disks to realize the benefits of striping. Throughput increases with the number of disks within a striped volume.

In Figure 45, data block 1 is mapped to section 1 of Disk 1; data block 2 is mapped to block 1 of Disk 2. Each subsequent data block is then written alternately between blocks on Disks 1 and 2. The striped unit size in this example is one block.

Virtual

Volume

Striped Volume

B1	B2	B3	B4
B5	B6	B7	B8

Disk 1 Disk 2

Physical	S1	S2	S3	S4
Volume	S5	S6	S7	S8
	S9	S10	S11	S12
	S13	S14	S15	S16

S1	S2	S3	S4
S5	S6	S7	S8
S9	S10	S11	S12
S13	S14	S15	S16

10022

Figure 45. Striped Volume Block Distribution

volume create stripe

You need to define four parameters to create a striped volume:

SWITCH	PARAMETER	DEFINITION	STATUS	EXAMPLE
–vol	VOLUME ALIAS	USER-GIVEN ALIAS	OPTIONAL	Stripe1
		FOR VOLUME	DEFAULT:
		CREATED	(SUB)DISK ALIAS
–sus	STRIPE UNIT SIZE	NUMBER OF	MANDATORY	100
		BLOCKS
		READ/WRITTEN
		INTO EACH VOLUME
		BEFORE MOVING ON
		TO THE NEXT CHILD
		IN THE STRIPE
–nbc	NUMBER OF	NUMBER OF	OPTIONAL	4
	CHILDREN	VOLUMES OR	DEFAULT: 2
		CHILDREN FROM
		WHICH TO BUILD
		STRIPED VOLUME

Chapter 6: Volume Configuration 97