Sun Virtual Library Extension (VLE)
 
Sun StorageTek Virtual Tape Control Software (VTCS)
 
Sun StorageTek Enterprise Library Software (ELS)
 

PLA-Support>Sun Systems>TAPE>Library Software>SN-TP: MAINSW VTCS
 

In this Document

Goal

Solution

Applies to:

Goal

How to vary a VLE offline.
How to vary a VLE online.
How to disable and enable a VLE.
How to disable and enable a STORMNGR.
How to disable a VLE.
How to disable a STORMNGR.
How to enable a VLE.
How to enable a STORMNGR.

Solution

1. Vary offline all VL-RTDs associated with the VLE
• e.g. F hsc_task,Vary RTD(V000-V00F) OFF
• Wait until all VL-RTDs are offline
2. Disable the STORMNGR within SMC
• e.g. F smc_task,STORMNGR NAME(stormngr) DISABLE
3. Perform the intended VLE maintenance, microcode upgrade, etc.
4. Enable the STORMNGR within SMC
• e.g. F smc_task,STORMNGR NAME(stormngr) ENABLE
5. Vary online all VL-RTDs associated with the VLE
• e.g. F hsc_task,Vary RTD(V000-V00F) ON

Notes:
The recommendation for making the VLE unavailable for disruptive service is to first vary off the VL-RTDs for the associated STORMNGR, verify all the VL-RTDs for that STORMNGR have indeed come offline and then disable the STORMNGR (VLE). Bringing the VLE back online should be done in the reverse order - first enable the STORMNGR and then vary the associated VL-RTDs online.

The RTD vary commands may not happen immediately because they do not execute until the VL-RTD is unloaded. However, on the VLE this will not normally take more than a minute. The STORMNGR command acts immediately and can therefore interrupt/disrupt VL-TRD communications if the VL-RTDs are online and in use.

Both the vary RTD and STORMNGR commands are needed. The first will put the VL-RTDs offline but will not stop allocation to the VL-RTDs. The second will stop allocation to the STORMNGR and therefore stop allocation to the VL-RTDs. So, the possibility does exist that while waiting for the last VL-RTD to come offline prior to issuing the STORMNGR disable command something may get allocated to an offline VL-RTD but that job will not be processed. Those allocations should be recovered by the software.

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