Logical unit settings for the EMC CLARiiON

Logical unit (LU) settings are configurable at the LU level.

Table 1 lists the options that must be set for each LU that is accessed by the SAN Volume Controller. LUs that are accessed by hosts can be configured differently.

Table 1. EMC CLARiiON LU settings supported by the SAN Volume Controller
Option	EMC CLARiiON default setting	SAN Volume Controller required setting
LU ID	Auto	N/A
RAID Type	5	Any RAID Group
RAID Group	Any available RAID Group	Any available RAID Group
Offset	0	Any setting
LU Size	ALL LBAs in RAID Group	Any setting
Placement	Best Fit	Either Best Fit or First Fit
UID	N/A	N/A
Default Owner	Auto	N/A
Auto Assignment	Disabled	Disabled
Verify Priority	ASAP	N/A
Rebuild Priority	ASAP	N/A
Strip Element Size	128	N/A
Read Cache Enabled	Enabled	Enabled
Write Cache Enabled	Enabled	Enabled
Idle Threshold	0–254	0–254
Max Prefetch Blocks	0–2048	0–2048
Maximum Prefetch IO	0–100	0–100
Minimum Prefetch Size	0–65534	0–65534
Prefetch Type	0, 1, or 2	0, 1, or 2
Prefetch Multiplier	0 to 2048 or 0 to 324	0 to 2048 or 0 to 324
Retain prefetch	Enabled or Disabled	Enabled or Disabled
Prefetch Segment Size	0 to 2048 or 0 to 32	0 to 2048 or 0 to 32
Idle Delay Time	0 to 254	0 to 254
Verify Priority	ASAP, High, Medium, or Low	Low
Write Aside	16 to 65534	16 to 65534

Note: The SAN Volume Controller cannot obtain or change the configuration options that are listed above. You must configure the options that are listed above.