EMC Symmetrix Timefinder survival guide

December 10, 2010 — 4 Comments

During a previous project I had the opportunity to work very closely with the EMC people and Symmetrix arrays, in fact I got a couple of very good friends from that project. At the time I created a bunch of text files for my self  reference about EMC SRDF and Timefinder technologies.

Today I decided to review that files, give them some order, well sort of, and put them here as a survival guide/quick reference in the hope that will be of help to any of you. The first of this guides will be about EMC Symmetrix Timefinder.

I don’t have sample output for every command, been more than a year since the last time I work with Timefinder, to complement my own samples I got several outputs from the Timefinder manuals.

This is not a complete Timefinder usage guide, just my personal notes taken from my direct experience with product. 

Timefinder Basics

EMC Timefinder is a replication solution that creates full volume copies. For the full-HP guys out there this is very similar to the XP or EVA Business Copy product.

There are two basic types of replication:

  • TimefinderClone – Creates point-in-time copies.
  • Timefinder/Snap – Creates pointer-based replicas, snapshots, only the changed data is written.

There are several optional components.

  • Timefinder/Mirror.
  • Timefinder/CG (Consistency Groups)
  • Timefinder/EIM (Exchange Integration Modules)
  • Timefinder/SIM (SQL Integration Modules)

Timefinder allows to retain multiple copies at different checkpoints for lowered RPO and RTO.

Symcli basics

Following is a list of the most basic symcli commands necessary to get your way around when you perform any Symmetrix task, including Timefinder.

- Get the list of the Symmetrix devices

root:/# symdev list
Symmetrix ID: 00029xxxxxxx
        Device Name           Directors                  Device
--------------------------- ------------- -------------------------------------
                                                                           Cap
Sym  Physical               SA :P DA :IT  Config        Attribute Sts      (MB)
--------------------------- ------------- -------------------------------------
0000 Not Visible            ???:? 01A:C0  BCV           Asst'd    RW       8632
0001 Not Visible            ???:? 16C:D0  BCV           Asst'd    RW       8632
0002 Not Visible            ???:? 01B:D0  BCV           Asst'd    RW       8632
0003 Not Visible            ???:? 16D:C0  BCV           Asst'd    RW       8632
…………………………………………………………………………………………………………………………………………………………………………………………………………………
0048 Not Visible            ???:? ???:??  VDEV          N/Grp'd   RW       8632
0049 Not Visible            ???:? ???:??  VDEV          N/Grp'd   RW       8632
004A Not Visible            ???:? ???:??  VDEV          N/Grp'd   RW       8632
004B Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
004C Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
004D Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
004E Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
004F Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
0050 Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
0051 Not Visible            ???:? ???:??  VDEV          N/Grp'd   NR       8632
0052 Not Visible            ???:? 16B:D1  2-Way Mir     N/A (SV)  RW       8632
0053 Not Visible            ???:? 01C:C0  2-Way Mir     N/A (SV)  RW       8632
0054 Not Visible            ???:? 16B:C0  2-Way Mir     N/A (SV)  RW       8632
…………………………………………………………………………………………………………………………………………………………………………………………………………………

- List all available devices from a device group

root:/# symld -g dg_oradev_01 list

- List host physical devices

root:/# sympd list

- List the disk groups:

root:/# /usr/symcli/bin/symdg list

                       D E V I C E      G R O U P S

                                                          Number of
 Name               Type     Valid  Symmetrix ID  Devs   GKs  BCVs  VDEVs

 dg_oracle_prod1    REGULAR  Yes    00029xxxxxxx    26     0    26      0
 dg_oracle_prod2    REGULAR  Yes    00029xxxxxxx    21     0    21      0
 dg_rac_01          RDF1     Yes    00029xxxxxxx    23     0    23      0
 dg_clvx_01         RDF1     Yes    00029xxxxxxx     5     0     5      0
 dg_oradev_01       REGULAR  Yes    00029xxxxxxx     3     0     0      0
 dg_timetest_02     RDF1     Yes    00029xxxxxxx    16     0    16      0
 grupo1             RDF1     Yes    00029xxxxxxx    22     0     0      0

root:/#

- Add devices to a disk group

  • Add physical devices
root:/# symld -g dg_oradev_01 add pd /dev/dsk/c2t4d12
  • Add Symmetrix devices
root:/# symld -g dg_oradev_01 add 006E

- Get diskgroup detailed info.

root:/# /usr/symcli/bin/symdg show dg_prod_01

Group Name:  dg_prod_01

    Group Type                                   : RDF1     (RDFA)
    Device Group in GNS                          : No
    Valid                                        : Yes
    Symmetrix ID                                 : 00029xxxxxxx
    Group Creation Time                          : Mon Nov 29 18:49:29 2007
    Vendor ID                                    : EMC Corp
    Application ID                               : ECC

    Number of STD Devices in Group               :    2
    Number of Associated GK's                    :    0
    Number of Locally-associated BCV's           :    2
    Number of Locally-associated VDEV's          :    0
    Number of Remotely-associated VDEV's(STD RDF):    0
    Number of Remotely-associated BCV's (STD RDF):    0
    Number of Remotely-associated BCV's (BCV RDF):    0
    Number of Remotely-assoc'd RBCV's (RBCV RDF) :    0

    Standard (STD) Devices (2):
        {
        --------------------------------------------------------------------
        Sym               Cap
        LdevName              PdevName                Dev  Att. Sts     (MB)
        --------------------------------------------------------------------
        DEV001                N/A                     01C8      RW      8714
        DEV002                N/A                     01C9      RW      8714
        }

    BCV Devices Locally-associated (2):
        {
        --------------------------------------------------------------------
        Sym               Cap
        LdevName              PdevName                Dev  Att. Sts     (MB)
        --------------------------------------------------------------------
        BCV001                N/A                     08A8      RW      8714
        BCV002                N/A                     08A9      RW      8714
        }

    Device Group RDF Information
        {
        RDF Type                               : R1
        RDF (RA) Group Number                  : 2               (01)

        Remote Symmetrix ID                    : 000287xxxxxx

        R2 Device Is Larger Than The R1 Device : False

        RDF Pair Configuration                 : Normal
        RDF STAR Mode                          : False

        RDF Mode                               : Synchronous
        RDF Adaptive Copy                      : Disabled
        RDF Adaptive Copy Write Pending State  : N/A
        RDF Adaptive Copy Skew (Tracks)        : 32767

        RDF Device Domino                      : Disabled

        RDF Link Configuration                 : Fibre
        RDF Link Domino                        : Disabled
        Prevent Automatic RDF Link Recovery    : Disabled
        Prevent RAs Online Upon Power ON       : Enabled

        Device RDF Status                      : Ready           (RW)

        Device RA Status                       : Ready           (RW)
        Device Link Status                     : Ready           (RW)

        Device Suspend State                   : N/A
        Device Consistency State               : Disabled
        RDF R2 Not Ready If Invalid            : Disabled

        Device RDF State                       : Ready           (RW)
        Remote Device RDF State                : Write Disabled  (WD)

        RDF Pair State (  R1 <===> R2 )        : Synchronized

        Number of R1 Invalid Tracks            : 0
        Number of R2 Invalid Tracks            : 0

        RDFA Information:
            {
            Session Number                     : 1
            Cycle Number                       : 0
            Number of Devices in the Session   : 491
            Session Status                     : Inactive

            Session Consistency State          : N/A
            Minimum Cycle Time                 : 00:00:30
            Average Cycle Time                 : 00:00:00
            Duration of Last cycle             : 00:00:00
            Session Priority                   : 33

            Tracks not Committed to the R2 Side: 0
            Time that R2 is behind R1          : 00:00:00
            R1 Side Percent Cache In Use       :  0
            R2 Side Percent Cache In Use       :  0

            }
        }

root:/#

Timfinder commands

- Associate BCVs to a device group. There are two ways:

root:/# symbcv -sid xxxx -g dg_oradev_01 associate dev 0001

- Establish the mirrors

root:/# symmir -g dg_oradev_01 -full establish DEV001 BCV001

- Split operations.

root:/# symmir -g dg_oradev_01 split

There are several additional split modes and/or modifiers.

  • Instant
root:/# symmir -g dg_oradev_01 split -instant
  • Force
root:/# symmir -g dg_oradev_01 split -force
  • Differential
root:/# symmir -g dg_oradev_01 split -differential
  • Reverse
root/# symmir -g dg_oradev_01 reverse split
  • Reverse differential
root:/# symmir -g dg_oradev_01 reverse split -differential

- Restore the BCV mirrors. The restore operation will copy the data from the BCV to the Standard device.

  • Differential restore
root:/# symmir -g dg_oradev_01 restore
  • Full restore
root:/# symmir -g dg_oradev_01 -full restore

- Reestablish operations. It is very important to tell the difference between Restore and Reestablish. Reestablish will do a differential update from the Standard device to the BCV device.

root:/# symmir -g dg_oradev_01 establish

- Get the list of BCV devices

root:/# symbcv list

Symmetrix ID: 00029xxxxxxx
              BCV Device                   Standard Device          Status
------------------------------------ --------------------------- ------------
                              Inv.                        Inv.
Physical         Sym RDF Att. Tracks Physical        Sym  Tracks BCV <=> STD
------------------------------------ --------------------------- ------------
Not Visible      0030    (M)       0 N/A             N/A       0 NeverEstab
Not Visible      0031    (m)       - N/A             N/A       - NeverEstab
……………………………………………………………………………………………………………………………………………………………………………………………………………
c4t1d0s2         0088              0 c4t0d0s2        0084      0 Split
c4t1d1s2         0089              0 c4t0d1s2        0085      0 Split
c4t1d2s2         008A              0 c4t0d2s2        0086      0 Split
c4t1d3s2         008B              0 c4t0d3s2        0087      0 Split

- Get the state of mirroring of the device pairs within a device group

root:/# /usr/symcli/bin/symmir -g dg_oracle_prod_01 query

Device Group (DG) Name: dg_oracle_prod_01
DG's Type             : RDF1
DG's Symmetrix ID     : 00029xxxxxxx

     Standard Device                    BCV Device                  State
-------------------------- ------------------------------------- ------------
                    Inv.                                  Inv.
Logical        Sym  Tracks Logical              Sym       Tracks STD <=> BCV
-------------------------- ------------------------------------- ------------

DEV001         0184      0 BCV001               039C *         0 Split
DEV002         0186      0 BCV002               039E *         0 Split
DEV003         0187      0 BCV003               039F *         0 Split
DEV004         0188      0 BCV004               03A0 *         0 Split
DEV005         0189      0 BCV005               03A1 *         0 Split
DEV006         018E      0 BCV006               03A6 *         0 Split
DEV007         018F      0 BCV007               03A7 *         0 Split
DEV008         0190      0 BCV008               03A8 *         0 Split
DEV009         0191      0 BCV009               03A9 *         0 Split
DEV010         01C7      0 BCV010               08A7 *         0 Split
DEV011         01CD      0 BCV011               08AA *         0 Split

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

Legend:

(*): The paired BCV device is associated with this group.

root:/#

- List all BCV sessions in a Symmetrix array

root:/# symmir list -sid xxxx

Symmetrix ID: 00000000xxxx

  Standard Device       BCV Device              State
-------------------- ----------------------- --------------
           Invalid             Invalid   GBE
Sym        Tracks     Sym      Tracks         STD <=> BCV
-------------------- ----------------------- --------------
002B               0 0E0B            0   ... Synchronized
002E               0 0E00            0   ..X Synchronized
002E               0 0E0A            0   ... Synchronized
0032               0 0E0F            0   ... Split
00FF               0 00FD            0   ... Split
0DF5               0 0DA5            0   ..X Synchronized
0DF5               0 0DA4            0   ..X Synchronized
0F70               0 001B         3592   X.. SyncInProg
0F71               0 001C         4496   X.. SyncInProg
0F93               0 0DF9            0   ..X Split
1015               0 1069            0   X.. Synchronized

Total       --------          --------
  Tracks           0              8088
  MB(s)          0.0             505.5

And we are done. As I said this is not a full guide so please if there is anything that you don’t get please leave a comment and I will try to clarify. Also if any of you have additional tips or “recipes” for Timefinder please comment :-)

Juanma.

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4 responses to EMC Symmetrix Timefinder survival guide

  1. 

    I created volumes and done masking and mapping but for some reason my volume show pysical device name Not visible… Now problem is that since I am not able to see the physical device name I cannot create gate keeper out of it….

  2. 

    check you zoning part

  3. 

    Hi,

    I have the bcv volume in split state, how do I reestablish them? Just hit the establish command..like

    symdg -g establish

    and then this would change the device state from split to establish and during that establish process is when the incremental updates would happen from the STD device to the BCV volumes?

    Please help my understanding.

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