Step by Step SRDF Implementation

SRDF

In General:

Step1: Create SYMCLI Device Groups. Each group can have one or more Symmetrix devices specified in it.

Step2: Use the SYMCLI to display the status of the SRDF volumes in your device group.

Step3: Set the default device group. You can use the Environmental Variables option.

Step4: Changing Operational mode. The operational mode for a device or group of devices can be set dynamically with the symrdf set mode command.

Step5: Check the communications link between the local and remote Symmetrix.

Step6: Create a partition on each disk, format the partition and assign a filesystem to the partition. Add data on the R1 volumes defined in the newsrcdg device group.

Step7: Suspend RDF Link and add data to filesystem. In this step we will suspend the SRDF link, add data to the filesystem and check for invalid tracks.

In Detail:

Step   1: Create SYMCLI Device   Groups. Each group can have one or more Symmetrix  devices specified in it.

Complete   the following steps on  both   the local and  remote hosts.

a) Identify the SRDF source and targetvolumes available to your assigned hosts. Execute the following commands on both the local and remote hosts.

#  symrdf   list pd  (execute on  both   local and  remote hosts)

or

#  syminq

b)  To view  all the RDF  volumes  configured in the Symmetrix  use  the following

#  symrdf   list dev

c) Display a  synopsis of  the symdg command and  reference it in the following steps.

#  symdg  h

d)  List all  device groups that are currently defined.

#  symdg list

e) On the local host, create a  device group   of  the type of  RDF1. On the  remote h ost, create a  device group   of  the type RDF2.

#  symdg  type RDF1  create newsrcdg   (on  local host)

#  symdg  type RDF2  create  newtgtdg (on  remote host)

f)  Verify that your  device group   was  added  to the SYMAPI  database on  both   the local and  remote hosts.

#  symdg list

g)  Add your  two  devices to your  device group   using the symld  command. Again  use( h)  for a  synopsis of  the command syntax.

On local host:

#  symld    h

#  symld    g  newsrcdg   add  dev  ###

or

#  symld    g  newsrcdg   add  pd  Physicaldrive# On remote host:

#  symld    g  newtgtdg add  dev  ###

or

#  symld    g  newtgtdg add  pd  Physicaldrive#

h)  Using  the syminq  command, identify  the gatekeeper devices. Determine if it is currently defined in the SYMAPI  database, if  not, define it, and  associate it w ith your  device group.

On local host:

#  syminq

#  symgate   list (Check  SYMAPI)

#  symgate   define pd  Physicaldrive# (to  define)

#  symgate   -g  newsrcdg   associate pd  Physicaldrive# (to associate) On remote host:

#  syminq

#  symgate   list (Check  SYMAPI)

#  symgate   define pd  Physicaldrive# (to  define)

#  symgate   -g  newtgtdg associate  pd  Physicaldrive# (to associate)

i) Display your  device groups. The  output is  verbose so  pipe it to more. On local host:

#  symdg show newsrcdg   |more

On remote host:

#  symdg show newtgtdg | more

j) Display a  synopsis of  the symld  command.

#  symld  -h

k)  Rename DEV001  to NEWVOL1

On local host:

#  symld    g  newsrcdg   rename  DEV001   NEWVOL1

On remote host:

#  symld    g  newtgtdg rename  DEV001   NEWVOL1

l) Display the device group   on  both   the local and  remote hosts. On local host:

#  symdg show newsrcdg   |more

On remote host:

#  symdg show newtgtdg | more

Step   2: Use  the SYMCLI  to display the status  of  the SRDF  volumes  in your  device group.

a) If on  the local host, check   the status of  your  SRDF  volumes  using the following  command:

#  symrdf   -g  newsrcdg   query

Step   3: Set   the default  device group. You can  use  the  Environmental Variables  option.

#  set SYMCLI_DG=newsrcdg  (on  the local host)

#  set SYMCLI_DG=newtgtdg  (on  the  remote host)

a) Check  the SYMCLI  environment.

#  symcli  def   (on  both   the local and  remote hosts)

b)  Test to see   if the SYMCLI_DG  environment variable  is working   properly by  performing  a    query     without specifying  the device group.

#  symrdf   query   (on  both   the local and  remote hosts)

Step   4: Changing   Operational mode.  The  operational mode for a  device or  group   of  devices can  be  set  dynamically with   the symrdf   set mode command.

a) On the local host, change   the mode of  operation for one  of  your  SRDF  volumesto  enable semi-synchronous operations. Verify results  and  change   back  tosynchro nous  mode.

#  symrdf   set mode semi  NEWVOL1

#  symrdf   query

#  symrdf   set mode sync  NEWVOL1

#  symrdf   query

b)  Change  mode of  operation to enable adaptive copy-disk mode for all  devices in the device group. Verify that  the mode change   occurred and  then disable  adaptive  copy.

#  symrdf   set mode acp  disk

#  symrdf   query

#  symrdf   set mode acp  off

#  symrdf   query

Step   5: Check  the  communications link  between   the local and  remote Symmetrix.

a) From the local  host,  verify  that  the remote Symmetrix  is  alive . If the host is attached  to  multiple  Symmetrix, you  may have  to specify the Symmetrix  SerialNumber   (SSN)  through the  sid option.

#  symrdf   ping   [ -sid xx  ] (xx=last two  digits of  the  remote SSN)

b)  From the local host, display the status  of  the Remote Link  Directors.

#  symcfg    RA  all list

c) From the local host, display the activity  on  the Remote Link  Directors.

#  symstat -RA all  i 10    c  2

Step   6: Create a  partition on  each  disk, format the partition  and  assign a  filesystem to the partition.  Add data on  the R1 volumes  defined in the newsrcdg   device group.

Step   7: Suspend  RDF  Link  and  add  data to filesystem. In  this step we will  suspend the SRDF  link, add  data to the filesystem and  check   for invalid tracks.

a) Check  that the R1 and  R2 volumes  are fully  synchronized.

#  symrdf   query

b)  Suspend  the link between   the source and  target volumes.

#  symrdf   suspend

c) Check  link status.

#  symrdf   query

d)  Add data to the filesystems.

e) Check  for invalid  tracks using the following command:

#  symrdf   query

f) Invalid tracks can  also be  displayed using the symdev show command. Execute t he  following command on  one  of  the devices in your  device group. Look at  the Mir ror set information.

On the local host:

#  symdev show ###

g)  From the local host, resume  the link and  monitor invalid tracks.

#  symrdf   resume

#  symrdf   query