|Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition|
Solution Type Troubleshooting Sure
Solution 1011355.1 : Sun StorageTek[TM] 5000 Series NAS: Troubleshooting Performance Issues
This document defines a step-by-step procedure for troubleshooting performance issues on the NAS. It is primarily focused on file copy performance to and from NFS and CIFS clients, though many of the recommendations will be useful for other issues. The document links to several Technical Instructions with the individual procedures for each step.
This issue will normally be reported as "file copy is slow", "performance is poor" or "access is slow". In severe cases, it may also be reported that the system or data service has hung.
Steps to Follow
Please follow each troubleshooting step below. The steps will provide instructions or a link to a document to collect data, validate the data and take corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Please do not skip a step.
Step 1 - Verify speed and duplex settings at both the NAS and the network switch. Also, note that network clients have the same requirements, and may also be the source of the problem <Document: 1011070.1>
2 - Verify network settings and check for network errors.
Misconfiguration and network errors are a common cause of poor
Step 3 - Ensure Operating system and storage firmware are updated to current revisions. Please contact Sun Support Services if you cannot access any content returned by this search. There have been a number of performance-related enhancements as we develop new ways to improve the product. Both OS and backend firmware are included in the software update links. Follow the instructions and apply all updates.
Step 4 - Verify that volume and LUN layout is optimally configured. Well-planned initial configuration of LUNs and volumes can improve performance significantly. For NFS clients, verify read and write blocksize. We recommend setting NFS clients to use a 32K blocksize for both reads and writes. This is normally done by adding rsize=32768, wsize=32768 to the mount options <Document: 1004361.1>
5 - Verify that sufficient free space is available and check files
per directory. Each volume must have some free space for file
operations and internal databases. A very large number of files in a
single shared directory can also negatively affect performance
Step 6 - Verify disk space used for Checkpoints. Checkpoints, if not properly managed can take a large amount of disk space and slow the entire system < Document: 1004363.1 >
Step 7 - Confirm that cache is enabled and LUN are optimal. A problem in either of these areas will cause extreme performance degradation until corrected < Document: 1011368.1 >
Step 8 - Check background processes and CPU utilization. Other system and user processes may be consuming CPU cycles and other system resources. Also, keep in mind that initializing new LUNs or performing other storage maintenance operations may have a negative effect on disk performance < Document: 1017984.1 >
9 - Collect the NAS extractor, diagnostic and backend performance
statistics to prepare for a support case or escalation. The
diagnostic collection should be done while the performance problem is
Step 10 - Collect support data from the storage. If the issue is storage-based, this will help the Engineer to resolve the issue. Note that this procedure will not work for Gateway configurations. In this case, collect the data directly from the backend storage using the provided management tools < Document: 1002481.1 >
11 - Collect a network trace. Follow the instructions to set up a
trace, set the filter to capture only traffic between the NAS and the
workstation performing the file copy or other problematic operation.
Start the trace, create the problem, then stop the trace
Step 12 - At this point, if you not been able to resolve the issue with the troubleshooting steps above, further troubleshooting is required. Contact Sun Support and be prepared to provide the data collected in the above steps.
Sun StorageTek 5320 NAS Gateway/Cluster System
Sun StorageTek 5320 NAS Appliance
Sun StorageTek 5320
Sun StorageTek 5310 NAS Gateway/Cluster System
Sun StorageTek 5310 NAS Gateway System
Sun StorageTek 5310 NAS Appliance
Sun StorageTek 5220 NAS Appliance
Sun StorageTek 5210 NAS Appliance
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NAS, normalized, CIFS, NFS, performance, slow, file copy, access
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