Asset ID:	1-72-1009428.1
Update Date:	2009-09-23
Keywords:

---

Solution Type  Problem Resolution Sure

Solution  1009428.1 :   Performance issue when writing to a Sun StorEdge[TM] 9960 system connected via a McData switch  


PreviouslyPublishedAs
213029

Symptoms

When writing small files to a Sun StorEdge[TM] 9960 system, write performance
is acceptable. However, when writing large files, write performance drops
dramatically.

Resolution

When an Hitachi Channel Adapter(CHA) with 1Gb/sec ports, is connected to a McData
switch, and a host with a Sun JNI Host Bus Adapter(HBA) # 375-3156, 2Gb/sec, and
are mapped into the same zone, the port to which the Sun system is connected on
the McData switch, needs to be configured to 1Gb/sec.

Under some conditions, the speed mis-match between the Hitachi 1Gb/sec CHA ports,
and the SUN JNI 2Gb/sec, can cause severe write performance degradation on the
Sun StorEdge 9960 system. There may be a speed syncronization problem between the
McData switch and the connected ports, unless they are all configured for the
same speed.

Relief/Workaround

none

Additional Information

This symptom and resolution, was seen on a Sun Fire[TM] V440 server, with Sun JNI
fiber card # 375-3156, Hitachi SE9960, McData Switch 6064 and Solaris 8 7/03
OS.

Product
Sun StorageTek 9960 System
Network Storage

ftp, performance, 9960, hitachi, mcdata, jni
Previously Published As
81594

Change History
Date: 2005-05-26
User Name: 18392
Action: Approved
Comment: Added product names, product nouns, did trademarking, expanded abbreviations, did some re-wording and formatting, added STM, corrected grammar and spelling. E-mailed author for his opinion of editing, but got no reply.
Version: 6
Date: 2005-05-23
User Name: 18392
Action: Accept
Comment:
Version: 0
Date: 2005-05-20
User Name: 90724
Action: Approved
Comment: approved.
Version: 0
Date: 2005-05-20
User Name: 90724
Action: Accept
Comment:
Version: 0
Date: 2005-05-20
User Name: 12196
Action: Approved
Comment: for review, again,
Version: 0
Date: 2005-05-20
User Name: 90724
Action: Rejected
Comment: I agree with Brian's earlier commments. The mention of FTP should be removed completely from the title and document. This is a issue with autonegotiation between the HBA, switch, and CHA on the array.

The doc will be rejected until all mention of FTP has been removed.
Version: 0
Date: 2005-05-20
User Name: 90724
Action: Accept
Comment:
Version: 0
Date: 2005-05-20
User Name: 12196
Action: Approved
Comment: for your review
Version: 0
Date: 2005-05-19
User Name: 34660
Action: Rejected
Comment: As per the previous review, this needs reworking or is rejected. Please can you look at the comments and make the required changes.
Version: 0
Date: 2005-05-19
User Name: 34660
Action: Accept
Comment:
Version: 0
Date: 2005-05-19
User Name: 12196
Action: Approved
Comment: for review
Version: 0
Date: 2005-05-19
User Name: 34660
Action: Rejected
Comment: I think you are talking about setting the same link speed on the storage/switch and host. If so can more information about this be put in (to justify why this should be required) and remove all the superfluous info about ftp.

Sending back to draft to allow for a rework.
Version: 0
Date: 2005-05-19
User Name: 34660
Action: Accept
Comment:
Version: 0
Date: 2005-05-18
User Name: 12196
Action: Approved
Comment: for your review
Version: 0
Date: 2005-05-18
User Name: 12196
Action: Created
Comment:
Version: 0
Product_uuid
2a94fb3c-0a18-11d6-90a8-c9c08656284f|Sun StorageTek 9960 System
aea70032-21a1-11d6-900d-e576a4de8318|Network Storage

Attachments

This solution has no attachment