二、utility help screen
A7,AAAA：（A7, utility help screen）
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A7,AAAA   -- GET THIS LIST
A7,'LGND' -- Show a7 legend
A7,       -- Show devices WP / invalid info with device attributes.
A7,C      -- Same as above but a compete devices list.
A7,'L'    -- Same as 0 but local mirrors only.
A7,'WP'   -- Same as above but a only devices with wp/fp.
A7,DC     -- Show dual copy status for each device.
A7,'SYNC' -- Show A7 bottom lines only. (WP & invalid counts only).
A7,D      -- Show the location of each drive (DA only).
A7,FE     -- Show system physical drives information (DA only).
A7,AD     -- SAME AS 'A7,0' + DRIVES LOCATION INSTEAD OF INVALID COUNTS (DA only)
A7,EC     -- Show invalid tracks for each device.
A7,ED     -- Show invalid tracks for each non migration device and
        M1 invalids + migration tracks for migration device.
A7,1EC    -- Show total invalid and migration tracks summary only
A7,1ED    --"--
A7,FC     ---Show PERMA CACHE extents and counts.
A7,ACFC   --  Show PERMA CACHE SLOTS counts.
A7,'EMUL' -- Show devices EMULATION and size.
A7,'LL'   -- Show devices labels. (DA only).
A7,'SSST' -- Show subsystems status (DA only).
A7,'DVST' -- Show devices status (DA only).
A7,'SSID' -- Show devices SYSTEM-IDS (DA only).
A7,'IFID' -- Show channels INTERFACE-ID (DA only).
A7,'DDC'  -- Show devices read & write counters (DA only).
A7,'SUMM' -- Show system level performance statistics (DA only).
A7,'GRUP' -- Show RAID-GROUPS devices/dirs/I/F (symm 4 only).
A7,'SDBF' -- Show sdbf sessions and tags (HA only).
A7,'SMMF' -- Show File SMMF sessions
A7,'NVDB',TABLE#['ALL'] --Show nvd bid table info.
A7,FD     -- Show all device-table impl definitions.
Options (P4): 'FLGS' - Show devices flags details.
   'RDF1' - Show Rdf flags details.
   'RDF2' - Show Rdf flags details.
   'FALL' - Show All the above flags details.
   'PLCY' - Show mirror service policy flag details.
   'DMSP' - Show DMSP and IMPL flag details.
A7,'DMWP' - Show devices DYNAMIC MAX write pending count (DA only).
A7,'R2WP' - Show devices R2 write pending count for adaptive copy wp.
A7,'ACGS' - Show the adaptive copy skew for all devices from global table
A7,'ACLS' - Show the adaptive copy skew for all devices from local table
A7,'MSR2' - Show the other side's 'other side' invalid counters
  Shows interesting dv's only, unless P3=C
  On RA only: If P4='NVDT'-then show it from the RA NVD.
A7,B      - Show all SA assoicated with their devices.
A7,BA,SA# - Show all Devices assoicated with the SA Specified.
A7,'DMSP' - Show interesting devs in dynamic mirror service policy table
A7,'DMSP','FORC' - Show all devs in dynamic mirror service policy table
A7,'DMSP','PHYS' - Show all devs in DMSP table, sort by physical
A7,'DMSP','DIR#' - Show all devs in DMSP table, sort by dir num