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GCS>Sun Microsystems>Storage - Disk>Network Attached Storage
 

Symptoms:

• Performance issues
  

Purpose/scope:

Performance can be severely degraded if LUNs are in a non-optimal state (i.e. degraded or rebuilding), or if the RAID cache is disabled for any reason (e.g. expired battery, incorrect settings).

This document explains how to check for each of these conditions.

• Connect to the NAS using telnet or ssh.
• Enter the administrator password.
• Type menu
• Locate the Extensions portion of the menu at the bottom right of the screen.
• Press the space bar until Diagnostics is listed as an option.
• Select the letter corresponding to Diagnostics

In the diagnostics screen, you can use the spacebar and the b key to scroll forward and backward. Alternatively, you can save the file and review it with a text editor. In either case locate Disk Subsystem Information, near the top of the output.

The following is abbreviated sample output with instructions for analysis interspersed. Note that all of the individual drive status has been removed for clarity:

 Disk Sub-System Information
---------------------------

 - Controllers Information
-----------------------
Number of Controllers : 2

   ~ Controller : 0

     Firmware Version : 06.19.25.10
Model Name       : 3992
Vendor Name      : SUN
Bus Width        : Fiber
Bus Speed        : Fiber 2Gbps
Bus Type         : Fiber
Partner status   : Active
Number of Enclosures	: 1
Sysmon Legacy Mode        : Disabled
Configured LUNs  : 2
Maximum Channels : 16
Maximum Targets  : 16
Maximum LUNs     : 255
Maximum Events   : 0
Number of Physical Channels : 15
Number of Critical Luns     : 0
Number of Offline Luns      : 0
Bus interface Speed         : 2000
Battery Backup              : Present
Memory size                 : 160
Memory speed                : 0
Cache size                  : 811
Clock speed                 : 0
Hardware speed              : 0
Memory Type                 : DRAM
Memory error correction     : None
Memory mode                 : ---

This is the controller status for controller 0. Key data are 'Number of Offline LUNS" and "Number of Critical LUNS". If these are non-zero, you have likely found the source of the performance problem. Also, the "Battery Backup" should be "Present", otherwise write-back cache will be disabled.

 - LUN Information
---------------

   ~ LUN : 0

     Raid Level                    : 5
Cache Policy                  : Write Back
Read Ahead Enable             : Yes
Number of devices in this LUN : 7
Size                          : 1713540 MB
Stripe Size                   : 64
LUN Name                      : isp1d010
LUN ID                        : 60:0A:0B:80:00:26:AB:C0:00:00:06:9F:46:1A:27:DA
LUN state                     : Online

 - LUN Information
---------------

   ~ LUN : 1

     Raid Level                    : 5
Cache Policy                  : Write Back
Read Ahead Enable             : Yes
Number of devices in this LUN : 7
Size                          : 1713540 MB
Stripe Size                   : 64
LUN Name                      : isp5d041
LUN ID                        : 60:0A:0B:80:00:26:AB:C0:00:00:06:99:46:19:E5:6E
LUN state                     : Online

This is the LUN information section. The key fields here are "Cache Policy" and "LUN state". Anything except "Write Back" and "Online" indicates a problem.

 - Sub System Information
----------------------
Battery power status  : Good
Current Power Value   : 0 minutes
Maximum Power Value   : 0 minutes
Threshold Power Value : 0 minutes
Battery Charge        : 95%
Battery Type          : Lithium Ion
Battery Age           : 172 days
Battery Life Remaining: 997 days
Battery Version       : 1

This is the battery subsystem information section for controller 0. The key fields here are "Battery power status" and "Battery Charge". Battery power status should be "Good", and "Battery Charge" should be near 100%. There should also be quite a bit of "Battery Life Remaining". A failed, failing or expired battery chould disable write-back cache for all connected LUNs and drastically reduce performance.

(Controller 1 data would normally follow here in the same order.)

* LunPath Information
-------------------

Dasdid 600 isp1d021 has 2 paths, Owner Real 1 Current 1 ; isp1d021 is the default path
	P1: isp1d021 status(3) UP ACTIVE                ; isp1d021 is the current path
	P2: isp2d001 status(1) UP                       ; isp2d001 is the standby path
Dasdid 700 isp1d022 has 2 paths, Owner Real 2 Current 2	; isp1d022 is the default path
	P1: isp1d022 status(1) UP                       ; isp1d022 is the standby path
	P2: isp2d002 status(3) UP ACTIVE                ; isp2d002 is the current path


When default path does not match current path, "W" flag is displayed from cli menu :
cli> menu -> LUN Paths
                                                       Path (HBA/SID)
   Lun                                      Available  Active	 Primary
A. isp1d021    /vol00 /vol01		    612.8MB    1/2	 1/2  OK
B. isp1d022    /vol10 /vol11		    612.8MB    2/0	 1/2  W  <-- W flag

"Owner Real X Current Y" is the LUN assignment information for a cluster system. You have to ensure that Real (X) and Current (Y) owner match (otherwise a cluster failover or misconfiguration has occurred).
For load balancing purposes each head should own a similar amount of LUNs

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