Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

Identifying devices that cannot be paced

1. Use the symcfg list command with the -rdfa option to determine if the SRDF/A session includes devices that cannot be paced. This command provides the following information related to write pacing:
   • The state of write pacing (group-level and device-level) for the SRDF group
   • Whether write pacing is currently activated and supported
   • Whether write pacing is configured for autostart
   • Whether there are devices in the SRDF/A session that might not be paced either because they have been set exempt from group-level write pacing or because they are not pace-capable.

   To view write pacing information for SRDF group 153:

   symcfg list -sid 1134 -rdfg 153 -rdfa

   
   Symmetrix ID : 000195701134
                     S Y M M E T R I X   R D F A   G R O U P S                  
   -------- ---------- -------- ----- --- --- --------- ------------------------
                                                              Write Pacing
       
    RA-Grp  Group      Flags    Cycle Pri Thr Transmit   Delay  Thr GRP DEV FLGS
            Name       CSRM TDA time          Idle Time (usecs) (%) SAU SAU P
   -------- ---------- -------- ----- --- --- --------- ------- --- --- --- ----
   153 (98) lc153142   .IS- XI.    15  33  50 000:00:00   50000  60 I.- I.- X
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       (FLGS) Flags for Group-Level and Device-Level Pacing: 
         Devs (P)aceable : X = All devices, . = Not all devices, - = N/A
   

   An X in the FLGS P column indicates that all of the devices in the SRDF group can be paced. A period in the FLGS P column indicates that some of the devices in the SRDF group cannot be paced either because they have been set exempt from group-level write pacing or because they are not pace-capable.

2. Use the symrdf list command to determine which devices cannot be paced.
   1. Use the symrdf list command with the -rdfa_wpace_exempt option to identify devices that are exempt from group-level write pacing.
   2. Use the symrdf list command with the -rdfa_not_pace_capable option to identify devices participating in the SRDF/A session that are not pace-capable.
3. Use the symdev show command to obtain additional information about the devices identified in the previous step. This command provides the following information related to write pacing:
   • Whether the device is exempt from group-level write pacing
   • Whether write pacing is currently activated and supported
   • Whether the device is pace-capable

   To view write pacing information for device 00d1:

   symdev show -sid 230 00d1

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   Write Pacing Information
               {
               Pacing Capable                     : Yes
               Configured Group-level Exempt State: Disabled
               Effective Group-level Exempt State : Enabled
               Group-level Pacing State           : Enabled
               Device-level Pacing State          : Disabled
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