Description

This document attempts to explain the steps required to validate that the EMC SRDF synchronization update has been refelected by VxVM when using DMP.

In this instance, the configuration consists of "4" EMC SRDF "R1" devices presented to production server "Dopey" from EMC Symmetrix id (SID) "822".
An additional "4" EMC SRDF "R2" devices have been presented to DR server "Bashful" from EMC Symmetrix ID (SID) "414".


Figure 1.0






Note: As of 5.0 MP3 onwards, the VxVM CLI command "vxdisk -e list" is capable of reporting the extended attribute based content for EMC BCV, BCV-NR, MIRROR, SRDF-R1, SRDF-R2, TDEV device states and EMC lun types.


In addition to the extended attribute content, the VxVM CLI "vxdisk" content can be customized with the use of additional attributes.


Dopey # vxdisk -pxh
VxVM vxdisk ERROR V-5-1-13920  Attribute "h" is not valid

The Supported Attributes :
DGID                VID                 PID                 ANAME
ATYPE               TPD_SUPPRESSED      NR_DEVICE           CAB_SERIAL_NO
LUN_SERIAL_NO       PORT_SERIAL_NO      CUR_OWNER           LIBNAME
LUN_OWNER           LUN_TYPE            SCSI_VERSION        REVISION
TPD_META_DEVNO      TPD_META_NAME       TPD_LOGI_CTLR       TPD_PHY_CTLR
TPD_SUBPATH         TPD_DEVICES         ASL_CACHE           ASL_VERSION
UDID                ECOPY_DISK          ECOPY_TARGET_ID     ECOPY_OPER_PARM
DEVICE_TYPE         DYNAMIC             TPD_HIDDEN_DEVS     LOG_CTLR_NAME
PHYS_CTLR_NAME      DISK_GEOMETRY       MT_SAFE             FC_PORT_WWN
FC_LUN_NO           HARDWARE_MIRROR     TPD_CONTROLLED      TPD_PARTITION_MAP
DMP_SINGLE_PATH     DMP_VMDISK_IOPOLICY  DDL_DEVICE_ATTR     DDL_THIN_DISK


Example


The local server "Dopey" has a VxVM diskgroup named "DopeyDg" containing four SRDF R1 type luns.
 

1.]  The disk contents are then replicated using EMC SRDF to the remote server "Bashful" for which has four corresponding SRDF R2 type luns.


Local:


Dopey # vxdisk -e list | grep srdf-r1
emc0_008c    auto:cdsdisk   r1-008C      DopeyDg     online               c1t5006048C5368E580d266s2 srdf-r1
emc0_008d    auto:cdsdisk   r1-008D      DopeyDg     online               c1t5006048C5368E5A0d223s2 srdf-r1
emc0_008e    auto:cdsdisk   r1-008E      DopeyDg     online               c1t5006048C5368E5A0d229s2 srdf-r1
emc0_008f    auto:cdsdisk   r1-008f      DopeyDg     online               c1t5006048C5368E580d269s2 srdf-r1
 

2.] During the SRDF synchronization process, VxVM on the remote server will not reflect the correct diskgroup/disk related content, until the SRDF related disks have been fully synchronized.

Dopey # symrdf -g DopeyDg query


Device Group (DG) Name             : DopeyDg
DG's Type                          : RDF1
DG's Symmetrix ID                  : 000290300822    (Microcode Version: 5773)
Remote Symmetrix ID                : 000290301414    (Microcode Version: 5773)
RDF (RA) Group Number              :  11 (0A)


       Source (R1) View                 Target (R2) View     MODES
--------------------------------    ------------------------ ----- ------------
             ST                  LI      ST
Standard      A                   N       A
Logical       T  R1 Inv   R2 Inv  K       T  R1 Inv   R2 Inv       RDF Pair
Device  Dev   E  Tracks   Tracks  S Dev   E  Tracks   Tracks MDA   STATE
-------------------------------- -- ------------------------ ----- ------------

DEV08C  008C RW       0     1788 RW 0072 WD       0        0 S..   SyncInProg
DEV08D  008D RW       0        0 RW 0073 WD       0        0 S..   Synchronized
DEV08E  008E RW       0     6434 RW 0074 WD       0        0 S..   SyncInProg
DEV08F  008F RW       0     4342 RW 0075 WD       0        0 S..   SyncInProg

Total          -------- --------           -------- --------
  Track(s)            0    12564                  0        0
  MB(s)             0.0    785.2                0.0      0.0

Legend for MODES:

 M(ode of Operation): A = Async, S = Sync, E = Semi-sync, C = Adaptive Copy
 D(omino)           : X = Enabled, . = Disabled
 A(daptive Copy)    : D = Disk Mode, W = WP Mode, . = ACp off

 

Remote:

Bashful # vxdisk -e list | grep srdf-r2

emc1_0072    auto:none      -            -           online invalid       c1t5006048C536979A0d65s2 srdf-r2

emc1_0073    auto:none      -            -           online invalid       c1t5006048C536979A0d66s2 srdf-r2

emc1_0074    auto:none      -            -           online invalid       c1t5006048C536979A0d67s2 srdf-r2

emc1_0075    auto:none      -            -           online invalid       c1t5006048C536979A0d68s2 srdf-r2

3.]  Once the SRDF synchronization process has completed, refresh the VxVM content on the remote host.
 

Synchronization complete


Local:


Dopey # symrdf -g DopeyDg query


Device Group (DG) Name             : DopeyDg
DG's Type                          : RDF1
DG's Symmetrix ID                  : 000290300822    (Microcode Version: 5773)
Remote Symmetrix ID                : 000290301414    (Microcode Version: 5773)
RDF (RA) Group Number              :  11 (0A)


       Source (R1) View                 Target (R2) View     MODES
--------------------------------    ------------------------ ----- ------------
             ST                  LI      ST
Standard      A                   N       A
Logical       T  R1 Inv   R2 Inv  K       T  R1 Inv   R2 Inv       RDF Pair
Device  Dev   E  Tracks   Tracks  S Dev   E  Tracks   Tracks MDA   STATE
-------------------------------- -- ------------------------ ----- ------------

DEV08C  008C RW       0        0 RW 0072 WD       0        0 S..   Synchronized
DEV08D  008D RW       0        0 RW 0073 WD       0        0 S..   Synchronized
DEV08E  008E RW       0        0 RW 0074 WD       0        0 S..   Synchronized
DEV08F  008F RW       0        0 RW 0075 WD       0        0 S..   Synchronized

Total          -------- --------           -------- --------
  Track(s)            0        0                  0        0
  MB(s)             0.0      0.0                0.0      0.0

Legend for MODES:

 M(ode of Operation): A = Async, S = Sync, E = Semi-sync, C = Adaptive Copy
 D(omino)           : X = Enabled, . = Disabled
 A(daptive Copy)    : D = Disk Mode, W = WP Mode, . = ACp off
 

Remote:

Bashful # vxdisk scandisks

Bashful # vxdisk -e -o alldgs list | grep srdf-r2
emc1_0072    auto:cdsdisk   -            (DopeyDg)   online               c1t5006048C536979A0d65s2 srdf-r2
emc1_0073    auto:cdsdisk   -            (DopeyDg)   online               c1t5006048C536979A0d66s2 srdf-r2
emc1_0074    auto:cdsdisk   -            (DopeyDg)   online               c1t5006048C536979A0d67s2 srdf-r2
emc1_0075    auto:cdsdisk   -            (DopeyDg)   online               c1t5006048C536979A0d68s2 srdf-r2

 
4.] How to validate the UDID related content and SRDF relationships


The UDID (Unique Disk Identifier) is composed of the VID (Vendor ID), PID (Product ID), CAB_SERIAL_NO (Enclosure Serial Number)  and LUN_SERIAL_NO (LUN serial number).

Note: The "udid" value represents the UDID from the DDL (Device Discovery Layer). The second "udid_asl" value represents the UDID that is held on disk.
 

Figure 2.0



 

Local:
 

Dopey # vxdisk -px UDID -x LUN_SERIAL_NO -x DDL_DEVICE_ATTR list | grep r1
emc0_008c    60060480000290300822533030303843 EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303843 srdf-r1
emc0_008d    60060480000290300822533030303844 EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303844 srdf-r1
emc0_008e    60060480000290300822533030303845 EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303845 srdf-r1
emc0_008f    60060480000290300822533030303846 EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303846 srdf-r1

 

The UDID values on the source LUNS will agree, whereas the UDID values on the target LUNS will disagree.
The reason being is that EMC SRDF will replicate a block-for-block copy of the source disk to that of the target disk.
 

Dopey # vxdisk -v list emc0_008c emc0_008d emc0_008e emc0_008f | egrep '(Device|udid)'
Device:    emc0_008c
udid:      EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303843
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303843
Device:    emc0_008d
udid:      EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303844
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303844
Device:    emc0_008e
udid:      EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303845
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303845
Device:    emc0_008f
udid:      EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303846
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303846


Note: The UDID values for the above source LUNS all agree as expected.

Remote:
 

Bashful # vxdisk -px UDID -x LUN_SERIAL_NO -x DDL_DEVICE_ATTR list | grep r2
emc1_0072    60060480000290301414533030303732 EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303732 srdf-r2
emc1_0073    60060480000290301414533030303733 EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303733 srdf-r2
emc1_0074    60060480000290301414533030303734 EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303734 srdf-r2
emc1_0075    60060480000290301414533030303735 EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303735 srdf-r2

 

Bashful # vxdisk -v list emc1_0072 emc1_0073 emc1_0074 emc1_0075 | egrep '(Device|udid)'
Device:    emc1_0072
udid:      EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303732
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303843    <<< differs
Device:    emc1_0073
udid:      EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303733
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303844    <<< differs
Device:    emc1_0074
udid:      EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303734
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303845    <<< differs
Device:    emc1_0075
udid:      EMC%5FSYMMETRIX%5F000290301414%5F60060480000290301414533030303735
 tag      udid_asl=EMC%5FSYMMETRIX%5F000290300822%5F60060480000290300822533030303846    <<< differs


Note: As expected the UDID values on disk differ to what is held in the kernel/DDL. The UDID values stored on disk for the R2 devices correspond to those of the source luns (R1 devices).