Asset ID:	1-71-1012456.1
Update Date:	2009-09-14
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1012456.1 :   72GB 15K RPM drives in Sun StorEdge[TM] 9970/80 System give fewer LDEVs than expected  


PreviouslyPublishedAs
217164

Description

Customers who have purchased 72GB 15K RPM disk drives will find that they are only able to create 5 OPEN-L LDEVs on a 3D+1P parity group, which is fewer than the 6 OPEN-L LDEVs you'll get on 72GB 10K RPM disk drives in 3D+1P. This is a limitation of the 15K RPM drives.

Steps to Follow

When creating OPEN-L LDEVs over a 3D+1P parity group, there is a difference in the number of LDEVs that can be created on the 10K RPM 72 GB drives VS. the 15K RPM 72 GB drives. Over the 10K RPM drives, you will be able to create 6 complete OPEN-L LDEVs, whereas with the 15K RPM drives you will only be able to create 5 OPEN-L LDEVs. This may be a surprise to customers who would expect the following yield based on this equation:

(3x72GB drives)/(36GB OPEN-L)= 6 LDEVs

This equation works for the 10K RPM drives, but with the 15K RPM drives there is not sufficient space for the final LDEV. The remaining space can be converted into a CVS LDEV, but it will not be the full capacity of the OPEN-L LDEV.

In addition, it should also be noted that there is a LDEV count discrepancy between 10K and 15K RPM drives for other emulations besides OPEN-L . Those totals are as follows:

EMULATION	10K disk	15K disk
OPEN-3	88	86
OPEN-9	29	28
OPEN-E	15	14
OPEN-L	6	5

The following are the Sun and Hitachi part numbers for the drives discussed above:

SUN PART	HITACHI PART	DESCRIPTION
370-5123	5513873-A	73GB 10K RPM Disk Canister, HDU450-72J1FC (V-Series)
370-6096	5518492-A	72GB 15K RAID Disk SS2C-K72 DKU-F455I-72K

Product
Sun StorageTek 9980 System
Sun StorageTek 9970 System
Disk Subsystems

9980, 9970, LDEV, emulation, SVP, 370-5123, 370-6096
Previously Published As
79727

Change History
Date: 2005-03-29
User Name: 25440
Action: Approved
Comment: Thanks for the clarification. Publishing.
Version: 5
Date: 2005-03-29
User Name: 25440
Action: Accept
Comment:
Version: 0
Date: 2005-03-29
User Name: 90724
Action: Approved
Comment: The Sun System Handbook describes this as a 73GB HDD, while the SE9980 Parts Catalog Maintenance Manual lists the following details for the HDD:

HDU450-72K1FC - DKS2C-K72FC - 5518492-A

In either case this is the same HDD, while the description states 73 the HDD is configured as a 72 GB HDD when installed with the DKS2C-K72FC type on the array.
Version: 0
Date: 2005-03-29
User Name: 90724
Action: Accept
Comment:
Version: 0
Date: 2005-03-29
User Name: 25440
Action: Rejected
Comment: Returning to Tech Review for clarification. The document refers to 72GB 10K RPM drives, yet in the table of part numbers these are referred to as 73GB drives. Please clarify. Thanks.
Version: 0
Date: 2005-03-29
User Name: 25440
Action: Accept
Comment:
Version: 0
Date: 2005-03-28
User Name: 30235
Action: Approved
Comment: Looks good technically.
Version: 0
Date: 2005-03-22
User Name: 90091
Action: Approved
Comment: Hello,

I've made the changes you suggested. Thank you for the feedback, I agree that mentioning the other emulation discrepancies is worthwhile. Please let me know if you feel it needs anything else.

Thanks!

-Aren
Version: 0
Date: 2005-03-18
User Name: 30235
Action: Rejected
Comment: Hi Aren,

I think it's worth mentioning that the same problem is seen with OPEN-3, OPEN-9 and OPEN-Es:

OPEN-3 - 88 vs 86
OPEN-9 - 29 vs 28
OPEN-E - 51 vs 14

Otherwise, looks fine.

Regards,

John
Version: 0
Date: 2005-03-03
User Name: 30235
Action: Accept
Comment:
Version: 0
Date: 2005-03-03
User Name: 90091
Action: Approved
Comment: Please review and provide feedback. Thank you.
Version: 0
Date: 2004-12-21
User Name: 90091
Action: Created
Comment:
Version: 0
Product_uuid
c2428fbe-8ab7-41d0-8b6e-ab489823c9d4|Sun StorageTek 9980 System
4ea4b951-9fc9-4f1f-b64e-69572a400fb4|Sun StorageTek 9970 System
bdf3c4d4-21a2-11d6-8ea3-e8c6ea8c6879|Disk Subsystems

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