Preventive Service Planning
This document provides information about limitations and known issues that you might encounter when you use IBM® Spectrum Control™ V5.3.6
This document contains the following sections:
- Support links and Documentation
- Installation, Upgrade, and Configuration
- General IBM Spectrum Control issues
- EMC Support Issues
- Cognos Analytics
- Documentation updates and corrections
- Browser issues
Support links and Documentation
To access all of the support documentation, including alerts and APARs, go to the IBM Support Portal.
For information about the devices that are supported by IBM Spectrum Control, see the Supported Hardware, Products and Platforms Interoperability Matrix Links at http://www.ibm.com/support/pages/node/388393
IBM Spectrum Control Knowledge Center: http://www.ibm.com/support/knowledgecenter/SS5R93_5.3.6/com.ibm.spectrum.sc.doc/tpc_kc_homepage.html
PDF guides for IBM Spectrum Control: http://www.ibm.com/support/knowledgecenter/SS5R93_5.3.6/com.ibm.spectrum.sc.doc/fqz0_r_printable_pdf_files.html
For a list of the known issues with the IBM Spectrum Control support for Hitachi Data Systems Virtual Storage Platform, see http://www.ibm.com/support/pages/node/241805
Product licenses for IBM Spectrum Control
IBM Spectrum Control V5.3.6 offers product licenses with differing functionality to meet your storage management needs. For information about these licenses, see http://www.ibm.com/support/knowledgecenter/SS5R93_5.3.6/com.ibm.spectrum.sc.doc/fqz0_r_product_packages.html
Installation, Upgrade, and Configuration
Direct upgrade from IBM Spectrum Control V5.2.12 to IBM Spectrum Control V5.3.2 or later is not supported.
If you are currently at 5.2.12, upgrade to another release earlier than 5.3.2 first and then you will be able to upgrade to the latest version.
IBM Spectrum Control V5.3.6 installation might appear to hang at Database component upgrade while database tables are cleaned up and migrated
When upgrading IBM Spectrum Control 5.2.11 or earlier to 5.2.16 or later, some customers may experience a long duration of the upgrade where it appears to hang while database tables are cleaned up and migrated. This is a known limitation, and is a required migration step that (depending on your database size) may take a long time to complete. It is a one-time only clean up process, and will not be experienced at the next upgrade of IBM Spectrum Control.
You can review the log files to determine if your upgrade is undergoing this database clean and migration process: In traceTPCInstall.log look near the end of the log file, there would be an executing SQL statement similar to one of these:
"SET INTEGRITY FOR T_RPT_HOST_KEYS ..." or "REFRESH TABLE T_RPT_HOST_KEYS ..."
And the last lines in the log file during the process would be similar to this:
"... INFO com.ibm.tpc.install.frontend.ia.actions.ProgressBarUpdater setPercentageComplete Seconds complete = ..."
Context Root Not Found on Spectrum Control 5.3.5 or later on RedHat 7
On RedHat 7, Db2 and IBM Spectrum Control's web server are configured to start at the same time on boot up. If Db2, for whatever reason, takes significantly longer to start than the IBM Spectrum Control web server, the user will see a 'Context Root Not Found' page when trying to load the IBM Spectrum Control GUI. Restarting the webserver after DB2 has fully started will resolve the issue until the next reboot.
To fix the issue across reboots, complete the following steps:
1.) Edit /etc/systemd/system/webWLP.service by adding the lines in bold:
Description=IBM Spectrum Control Web Server
ExecStart=/usr/bin/bash -c "/opt/IBM/TPC/wlp/bin/server start webServer --clean > /opt/IBM/TPC/wlp/bin/../../web/log/startServer.log"
ExecStop=/usr/bin/bash -c "/opt/IBM/TPC/wlp/bin/server stop webServer > /opt/IBM/TPC/wlp/bin/../../web/log/stopServer.log"
2.) Execute the following command as root:
# systemctl daemon-reload
Ensure that you've also implemented this fix for Db2 autostart on RedHat 7:
Verifying that the Netlogon service is running when the Spectrum Control server is in a Windows Domain
IBM Spectrum Control uses WebSphere® Application Server Liberty to authenticate domain users. WebSphere Application Server Liberty requires that the Microsoft Netlogon service is enabled and running to authenticate these users.
General IBM Spectrum Control issues
APAR IT31680: Showing zero value for some SVC/Storwize storage capacities
Spectrum Control and Storage Insight are showing zero values for some storage capacities values such as Physical Capacity and Allocated Capacity of their managed SVC or Storwize subsystems running firmware level below 8.2.
This happens due to an SVC CLI 8.1.x limitation surfacing which is visible in Spectrum Control and Storage Insights GUI after upgrading to 5.3.5 or higher, where the capacity values for SVC family devices had changed to rely on the SVC physical capacity values.
The issue only affects SVC family devices, and does not impact FlashSystem 900 devices.
The issue is resolved in the newer version of SVC firmware, starting with:
For details see SVC APAR HU01916: The GUI Dashboard and the CLI lssystem command report physical capacity incorrectly
APAR IT24763: Adding or modifying the connection information for an IBM FlashSystem V9000
When adding or modifying the connection information, be sure to use the correct credentials for the FlashSystem V9000: the connection information for the V9000 control nodes.
Probe of a FlashSystem V9000 will fail if connection credentials were for the internal FlashSystem 900 module rather than providing connection information for the V9000 control nodes.
The reported IBM Spectrum Control probe error is: CMMVC7205E The command failed because it is not supported
IBM Spectrum Control can only manage the control nodes of a V9000 cluster, it cannot manage the backend Flashsystem module.
APAR IT23975: Port down/offline alerts generated for FlashSystem 900 when the port is simply unused/disconnected.
IBM Spectrum Control is generating "error" alerts for an IBM FlashSystem 900 storage device, for ports that are not physically connected to a SAN. IBM Spectrum Control is receiving port alerts for ports that are known to be disconnected, and no matter the suppression settings selected, the alerts come back. This differs from the way that all other IBM storage operates, including SVC, Storwize, and other IBM storage where unused ports do not trigger alerts and do not report errors about unused ports. Typically port alerts should only trigger if a port that was connected, becomes disconnected. That is how the rest of IBM storage environment operates. At this time there is no way to make this behavior consistent with the rest of their storage.
The alert for inactive and configured FlashSystem port is working as designed because the condition is an "offline" status according FlashSystem GUI also. Inactive and unconfigured FlashSystem port does not represent an error condition to generate alerts in IBM Spectrum Control. The different port status inactive configured / inactive unconfigured reported by FlashSystem device are due to the installed small form-factor pluggable (SFP) transceivers onto the interface card in the system canister. When SFP is installed and the port is not connected, the status reported by FlashSystem is inactive and configured port.
The workaround for changing the port status is to remove the unused SFP and reset the interface card in the canister. More information how to add/remove SFPs to the FlashSystem storage enclosure can be found in the FlashSystem knowledge center: https://www.ibm.com/support/knowledgecenter/en/STKMQB_1.5.1/com.ibm.storage.flashsystem900.1.5.1.doc/tms_add_sfps.html
Incorrect overhead capacity value for block storage systems
Spectrum Control might report an incorrect overhead capacity for some block storage systems such as XIV, EMC Unity, FlashSystem 9100 and FlashSystem A9000.
Provisioning fails when requesting compressed volumes from a data reduction pool
When you provision compressed volumes from storage systems that run IBM Spectrum Virtualize 8.1.1 or later, you might see the following error message:
HWNCA0005E IBM Spectrum Control cannot provide the requested <n> GiB of capacity that also satisfies the requirements of the service class.
This issue occurs under the following conditions:
- The service class specifies that the storage resources must be able to compress volumes.
- IBM Spectrum Control attempts to provision the storage from a data reduction pool.
Use a service class that does not specify that the storage resources must be able to compress volumes. Alternatively, ensure that the available IBM Storage Virtualizers contain storage pools that are not configured as data reduction pools.
HDS back-end storage devices behind a SAN Volume shows as "not monitored"
IBM support worked with Hitachi support and this is the answer from Hitachi:
We have identified the root cause and are working on new SVP SMI-S Provider code to fix the issue.
Details: When IBM SMI-S Spectrum Control version 18.104.22.168 sends query “HITACHI_StorageProcessorSystem”, the Controller ID on DKC1 side that the SVP SMI-S provider calculates was incorrect; so IBM SMI-S Spectrum Control version 22.214.171.124 does not receive the port information for DKC1 side correctly from the SVP.
Unfortunately there is no workaround at present. The permanent fix will be to upgrade to the new code. You can see the status of this APAR here: http://www.ibm.com/support/docview.wss?uid=swg1IT25032
Submitting two tiering tasks to run at the same time or overlap might cause one of them to not complete
When submitting two tiering tasks to run at the same time or overlap their running times, they might stall and fail to complete. There are no errors displayed, and the logs indicate that the tasks are still running, however if they stall no further tasks are updated or completed. This situation can occur for the first tiering task or for both.
To avoid this problem, submit one tiering task at a time and wait for it to complete before submitting another tiering task.
In Metro Mirror or Global Copy relationship, if a Peer to Peer Remote Copy (PPRC) is terminated and then deleted on one of the storage systems, the other storage system retains the relationship
If a storage system is not aware of the termination due to the loss of the PPRC path, volumes on that system might be counted as both unprotected and protected.
To correct the reporting, take one of the following actions:
- Issue a terminate to the storage system, which retains the relationships.
- Reestablish the PPRC paths and the relationship by using the dscli command or another copy services management tool (such as the CSM product).
Provisioning fails with ADD_PORTS_TO_HOST message on XIV 11.5.0 when modifying host
When trying to provision storage from an IBM XIV® 11.5.0 system, the provisioning task fails with an "ADD_PORTS_TO_HOST task failed" message when trying to provision storage to a host that is already defined on the XIV subsystem. This can happen when the host definition does not contain all the Fibre Channel ports that IBM Spectrum Control is trying to assign the volume to.
For example, if you try to provision storage to a host that has 2 Fibre Channel ports and the host is
already defined on the XIV 11.5.0 system but with only one of the Fibre Channel ports, the assign job will fail and the second port will not be added to the host.
This condition does not occur when IBM Spectrum Control is creating the host definition, or when an existing host definition already has all ports defined. This issue does not occur with XIV 11.4 systems, and 11.5.1 or later systems.
Workaround: modify the host definition on the XIV 11.5.0 system to contain all the Fibre Channel ports, then run a probe of the XIV 11.5.0 system in IBM Spectrum Control or upgrade to XIV 11.5.1 or later.
Enabled ethernet port that is not connected to a switch can cause the GUI to hang
On some IBM servers running Windows 2012, an enabled ethernet port can cause the IBM Spectrum Control web-based GUI to stop responding if the port is not connected to a switch. This condition causes a Db2 SQL -911 error and also causes the IBM Spectrum Control GUI to stop responding.
To prevent this, disable the ethernet port or configure the port by using the instructions here: https://publib.boulder.ibm.com/infocenter/bladectr/documentation/index.jsp?topic=/com.ibm.bladecenter.hs22.doc/dw1iu_t_lan_over_usb_install_windows_driver_install.html
Disable Windows User Account Control to edit configuration files
On Windows installations, if you installed IBM Spectrum Control by using a domain user account, you must disable User Account Control to edit the IBM Spectrum Control configuration files.
IBM Spectrum Control cannot detect the mount status of file systems on Scale Out Network Attached Storage and Storwize V7000 Unified storage systems
If a file system is manually unmounted from an IBM Scale Out Network Attached Storage (SONAS) or Storwize® V7000 Unified storage system, IBM Spectrum Control cannot detect that the file system was unmounted. Because of this limitation, information that is displayed in the IBM Spectrum Control GUIs is not accurate and some storage-related actions on the file system might fail.
For example, when you provision storage, a file system on a Storwize V7000 Unified storage system might be recommended for provisioning. However, if that file system was manually unmounted after it was first detected by IBM Spectrum Control, the provisioning action will fail. An unmounted file system cannot be used for provisioning. To avoid this issue, ensure that the monitored file systems on the Storwize V7000 Unified storage system are mounted before you run the provisioning action.
IBM Spectrum Control cannot monitor SAS ports on Storwize devices
After you add a Storwize device for monitoring in IBM Spectrum Control, you can view information about its health, status, capacity, and performance. However, you can't monitor the SAS ports on a Storwize device. To monitor those ports, use the management GUI of the device.
A new IBM SONAS fileset might be mistakenly deleted
The fileset information was deleted in the other system before the new fileset with the existing ID was created.
If IBM Spectrum Control discovers a new IBM SONAS fileset, the ID of a deleted file set might be reused for the new file set. If you delete the older fileset in IBM Spectrum Control, the new file set is deleted instead. This issue occurs in the following circumstances:
A file set that is known to IBM Spectrum Control is deleted in a system other than IBM Spectrum Control.
IBM Spectrum Control retained the deleted file set information, either because the probe was not run after the file set was deleted or because the retention period of the file set has not expired.
The file set information was deleted in the other system before the new fileset with the existing ID was created.
IBM SAN Volume Controller and IBM Storwize devices might not accurately report used space of data reduction pools and deduplicated volumes
When an SAN Volume Controller or Storwize device is configured with data reduction pools, it (on certain firmware levels, including 126.96.36.199) no longer reports the used space for a specific volume, and the tier distribution is no longer reported. This is a limitation from the firmware with data reduction pools/deduplicated volumes.
Running multiple optimization recommendations at the same time results in a Pool Exhaustion Exception error
In some cases, running more than 15 optimization recommendations at the same time can cause one or more of the individual recommendation executions to result in a Pool Exhaustion Exception error. This can be caused by a lack of available resources in the operating system thread pool. You can manually complete the failed recommendations.
Changing an existing NetApp filer that uses a Storage Resource agent to use NAPI
You cannot change an existing NetApp filer that is managed by using a Storage Resource agent to be directly managed by using NetApp NAPI-based management. If you want to change from using a Storage Resource agent to NAPI for your existing NetApp filers, you must add the filers to IBM Spectrum Control again. Specify the NetApp credentials when you add the filer.
IBM Spectrum Control determines that the NetApp resource is already monitored. IBM Spectrum Control modifies the data source information so that the NetApp filer data is retrieved directly from the NetApp itself rather than from the Storage Resource agent.
Setting the rate at which data is copied between volumes that run IBM Spectrum Virtualize
IBM Spectrum Control can do tasks that significantly alter the structure of storage. For example, IBM Spectrum Control can add a mirrored volume copy, or migrate volumes from one pool to another by using storage optimization functions. When IBM Spectrum Control performs these tasks, a default synchronization rate of 100% is set.
For more information about how to change the synchronization rate, see the "Changing the synchronization rate for volumes on SAN Volume Controller or Storwize family systems" http://www.ibm.com/support/knowledgecenter/SS5R93_5.3.6/com.ibm.spectrum.sc.doc/tbs_svc_setting_sync_rate.html .
Probes with a Storage Resource agent (SRA) on Linux servers hang and remain "In Progress" forever
SRA probes run Logical Volume Manager (LVM) commands and these can hang which causes the SRA to hang and appear to be "In Progress" indefinitely.
To verify that this is the situation causing the hang, view the SRA agent trace log on the SRA Deployment and verify that the last command was an LVM one.
To recover from this situation:
- Kill the hung SRA process
- Kill the hung LVM command
- From a command line, retry the LVM command and verify that it runs successfully. If it does not, use the LVM documentation to repair the LVM so that it does.
- Restart the SRA
You can follow the progress of the APAR related to this issue here: http://www.ibm.com/support/docview.wss?uid=swg1IT15105
RHEL known issues with fprintd-pam module (fingerprint authentication module)
Application Groups and Aggregated Metrics
For application groups, the performance data is aggregated from the volumes added to the group, either directly or using a filter. The values displayed for the aggregated Read Response Time, Write Response Time, and Overall Response Time are incorrect. All other metrics currently supported for application aggregation are rendered correctly.
IBM Spectrum Control might report incorrect vmdk size and incorrect capacity of VM
IBM Spectrum Control persists the relation between a vmdk and vmdisk, restricting the relation to vmdisk <-> current vmdk file. The current vmdk file has an aggregate size which includes the sizes of snapshots up to the current vmdk file. IBM Spectrum Control associates the latest running delta file with vmdisk, hence IBM Spectrum Control might report the size smaller than actual size of the vmdisk if there are newer snapshots (which are not included in the current vmdk size).
Storage Resource agent on zSeries Linux
The Storage Resource agent deployed to Linux on zSeries only supports direct attached disks. See also the support matrix page, IBM Spectrum Control 5.3.x - Storage Resource Agents, Hypervisors, and Multipathing: https://www.ibm.com/support/pages/node/720335
Export Performance Data Tool
The output format from the exportPerformanceData Script has changed in IBM Spectrum Control 5.3.4. To minimize the impact of this and all future output format changes, users of the CSV files are encouraged to parse the column headers they are interested in.
EMC Support Issues
In 5.3.0 and later, you can view more information about the capacity, space usage, and performance of EMC™ storage systems. However, keep in mind the following issues for EMC support:
On the details page for an EMC storage system, duplicate NAS nodes might be displayed if the EMC's NAS Servers support both NFS and CIFS protocols. This issue occurs because each protocol represents a node. For example, on the same NAS server, if NAS1451 supports NFS and NAS1451 supports CIFS protocols, two node entries are displayed on the details page for the storage system.
Information about both FC and Serial Attached SCSI (SAS) ports are returned when FC ports are probed.
Thin-provisioned volumes: The value for allocated space is incorrect.
Total or available capacity values of each storage tier in a storage pool are incorrect.
Thin pools: The value for physical allocated space is incorrect.
File system pools are not displayed.
Total or available capacity values of each storage tier in a storage pool are incorrect.
The VNX regular thin pool's "pool capacity" value, returned by EMC SMI-S provider, is slightly lower than reported by the element manager. This applies only to VNX thin pool, referred to as "Pools" in Unisphere.
Disk and volume response times and utilization percentages: The displayed values for these metrics are higher than their actual value.
Available pool space or any allocated capacity values are always 0.
All aggregated volume capacity values are 0 because of the missing relationship between pools and volumes.
Mappings of volume to pool and volume to disk are not displayed.
Reporting: In Cognos Analytics, pre-defined reports might not be available for EMC storage systems.
In 5.3.5 and later, you can monitor Unity devices. Due to the mismatch of old FS UID format from 5.3.5 probe and new FS UID format from 5.3.6 PM data collection, no file system metrics will be displayed until a manual or next schedule probe / data collection is run on Unity.
HDS Support Issues
Hitachi VSP systems are supported as virtualizers and show the backend storage system and external disks. It is not possible to show managed disks mapped directly to a host.
NetApp Support Issues
If you are using AIX® to monitor NetApp ONTAP 9, you must install the libgcc<version>.ppc system library using root privileges before you add NetApp storage systems. To download the library, go to the AIX Toolbox for Linux Applications. Find the appropriate version of the library for your AIX installation. The minimum version required is libgcc6-6.3.0-1. '
GPFS/GSS/Spectrum Scale is not supported in Cognos Analytics
GPFS/GSS/Spectrum Scale™ file systems are not correctly represented in Cognos reports and are not supported in Cognos.
Information is not collected about NFS and CIFS exports that are defined on a GPFS/GSS/Spectrum Scale clusters.
Links to Help in IBM Spectrum Control 5.3.5 predefined reports open the public IBM Spectrum Control Knowledge Center
When using the Cognos Analytics User Interface to generate IBM Spectrum Control predefined reports, the Help link will open the IBM Spectrum Control Knowledge Center on ibm.com. The system running Cognos Analytics will need access to the internet to open to the knowledge center.
Documentation Updates and Corrections
Check here for missing, updated, or corrected information in the documentation for IBM Spectrum Control.
Missing information: The REST API includes changes for how physical and effective capacity are reported
In version 5.3.5 and later, capacity values in the REST API (and GUI) were updated to better reflect capacity usage in devices that support hardware compression. Capacity usage is now reported based on physical capacity rather than effective capacity.
The devices that are affected by this update are:
- Storage systems such as FlashSystem 9100, FlashSystem 900, and Storwize® V7000 Gen3, which contain IBM FlashCore® Modules with hardware compression
- SAN Volume Controller and Storwize storage systems that are configured as storage virtualizers, and which use back-end storage systems with hardware compression
- Pool Capacity (GiB)
- Physical Allocation (%)
- Available Pool Capacity (GiB)
- Allocated Space (GiB)
- Effective Capacity (GiB)
- Effective Allocation (%)
- Effective Available Capacity (GiB)
- Effective Used Space (GiB)
The information in the “Transforming storage volumes” section of the User's Guide PDF is not correct. See the following topic in the knowledge center for the correct information:
Browser displays a security certificate error
Some browsers will display: "There is a problem with this website's security certificate." when you log in to IBM Spectrum Control. To continue to the GUI, click "Continue to this website" and you will be returned to the previous page. This behavior does not occur on all browsers.
Keyboard navigation with Firefox for Mac users
Using a keyboard to navigate within IBM Spectrum Control is an important part of our focus on accessibility. Most of the features in the GUI are accessible by using the keyboard. For those features that are not accessible, equivalent function is available by using the command-line interface (CLI), except as noted in the product release notes.
If you're using Firefox on a Mac with IBM Spectrum Control and want to use keyboard navigation, complete the following steps:
- In Firefox, go to Preferences > Advanced > General and uncheck Always use the cursor keys to navigate within pages. This step enables the use of Tab key to navigate between GUI elements.
- Open your Mac's System Preferences app, go to Keyboard > Shortcuts, and select All Controls.
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22 February 2022