Navisphere Command Line Interface (CLI) Reference - VMware Communities

Basic CommandschglunChanges parameters on a currently bound LUNDescriptionThe naviseccli or navicli chglun command changes parameters on acurrently bound LUN. You must use at least two switches withchglun and one of the switches must be the LUN number -l lun.To change a metaLUN, use the naviseccli command with the -modifyswitch, as described on page 348.Caching recommendations for different RAID typesRAID type Write caching Read cachingRAID 0 Acceptable RecommendedRAID 1 Acceptable RecommendedRAID 1/0 Acceptable RecommendedRAID 3* Recommended RecommendedRAID 5 Highly recommended RecommendedRAID 6 Highly recommended RecommendedDisk Acceptable RecommendedHot Spare Not Allowed Not Allowed* For RAID 3, write caching is supported only on CX3 series, CX series storage system runningFLARE version 02.06.xxx.x.xxx or higher, or a dual-SP AX4-5 series storage system runningNavisphere Manager. Read caching is supported only on a CX3 series, CX series, or a dual-SPAX4-5 series storage system running Navisphere Manager.Note: LUNs cannot use write caching until you enable the write cache(page 260). LUNs cannot use read caching until you enable the read cache forthe SP that owns the LUN. When binding RAID 1/0 LUNs, the order inwhich you select modules is important. The first module you select is the firstpart of the mirror’s primary image and the second module is the first part ofthe mirror’s secondary image; the third module is the second part of theprimary image, the fourth module is the second part of the secondary image;and so on for any other modules in the LUN. In other words, the first andsecond modules selected are a pair of peer image parts, the third and fourthmodules are another pair of peer image parts, and so on. Any change to therebuild time takes effect as soon as the operation completes.92 EMC Navisphere Command Line Interface (CLI) Reference