Ashit
2 Iron

Thin Lun consumed size is greater than capacity

I noticed this with one of my CX array where consumed size is greater than the user capacity.

Agent Rev:           7.30.10 (2.48)
Revision:            04.30.000.5.508
Model:               CX4-120
Prom Rev:            5.20.00

Here is the o/p with getlun

LOGICAL UNIT NUMBER 33

Name:  Thin LUN 33

UID:  60:06:01:60:22:91:25:00:52:A1:AC:3D:A4:AC:DE:11

Current Owner:  SP B

Default Owner:  SP B

Allocation Owner:  SP B

User Capacity (Blocks): 4194304

User Capacity (GBs):  2.000

Consumed Capacity (Blocks):  8389120

Consumed Capacity (GBs):  4.000

Pool Name:  Thin Pool 0

Raid Type:  r_5

Disk Type:  SATAII

Here it can be noticed that User capacity is greater than the consumed capcaity.

Labels (1)
0 Kudos
3 Replies
jps00
3 Zinc

Re: Thin Lun consumed size is greater than capacity

That is a very small LUN.  The difference is the metadata.

This is discussed in the 'Capacity overhead' section on page 68 of EMC CLARiiON Best Practices for Performance and Availablity: Release 30.0 Firmware update.

Ashit
2 Iron

Re: Thin Lun consumed size is greater than capacity

Thanks. It helps.

-_Ashit

0 Kudos
Ashit
2 Iron

Re: Thin Lun consumed size is greater than capacity

I have a question related to this.

From the documents, For a thin LUN 'consumed capacity' is the physical space used by the LUN  and for a Thick LUN it is the host-visible capacity used by the LUN.

Does the 'consumed capacity' of a Pool LUN includes the RAID overhead, as it is the physical space. Also does it include the metadata overhead (metadata overhead = LUN size * 0.02 + 3) also?

Use capacity already excludes the RAID and mapping overhead.

0 Kudos