9.4 IBM Spectrum Virtualize code update Because IBM Spectrum Virtualize might be at the core of your disk and SAN storage  environment, its update requires planning, preparation, and verification. However, with the  appropriate precautions, an update can be conducted easily and transparently to your servers  and applications. This section highlights applicable guidelines for IBM Spectrum Virtualize  update. Before upgrading your IBM Spectrum Virtualize to V8.1, or higher, you must enable  the Host Offloading Throttle, for more details check the following website: Most of the following sections explain how to prepare for the IBM Spectrum Virtualize update.  The last two sections present version-independent guidelines to update the IBM Spectrum  Virtualize system and disk or flash drives. Note:  For customers who have purchased the IBM SAN Volume Controller with 3 years  warranty (2147-SV1), this comes with Enterprise Class Support (ECS) and this entitles the  customer to two code upgrades, performed by IBM, per year (total of 6 across the 3 years  of warranty). These upgrades are performed by the IBM dedicated Remote Code Load  (RCL) team or, where remote support is not allowed or enabled, by an onsite SSR. For further information on ECS, refer to the IBM Knowledge Center here: IBM Knowledge Center for ECS First, determine your current and target IBM Spectrum Virtualize code level. Log in to your  IBM Spectrum Virtualize web-based GUI and find the current version.  On the right hand side of the top menu drop down line, select ? About IBM SAN Volume  Controller . Figure 9-3 on page 407 shows the About IBM SAN Volume Controller output panel and  displays the current code level. In this example the current code level is 8.1.3.6. Alternatively, if you are using the CLI, run the  svcinfo lssystem  command. Chapter 9. Maintenance  407 Figure 9-3 About IBM SAN Volume Controller output pane l 9.4.1 Current and target IBM Spectrum Virtualize code level Host Offload Throttling