Section 1/2:
Notes
SnapMirror Over
Multiple Paths:
Example in /etc/snapmirror.conf:
SRC_conf = multi
(SRC-e0a,DEST-e0a) (SRC-e0b,DEST-e0b)
SRC_conf:vol1 DEST:vol1 - sync
Throttle Network
Usage:
Example in /etc/snapmirror.conf:
snapmirror throttle {n}
DEST:DEST_PATH
n = throttle value
in kilobytes per second (1 to 125’000)
Options:
options
replication.throttle.enable {on/off}
options
replication.throttle.incoming.max_kbps {value}
options replication.throttle.outgoing.max_kbps
{value}
Planning for
SnapMirror Updates:
Use the -
snap delta VOL_NAME
- command to
determine the rate of data change between Snapshot copies on a volume.
Compare the file
system size of the two volumes with:
vol status -b VOL_NAME
Note: The
snapmirror initialize sets the vol options fs_size_fixed to on!
SnapMirror Access:
Use the -
snapmirror.access
- option or create
the file -
/etc/snapmirror.allow
SnapMirror.Conf:
Syntax:
SRC:/vol/SRC_VOL/{SRC_QTREE} DEST:/vol/DEST_VOL/{DEST_QTREE}
{arguments} {schedule}
Note: Schedule is -
minute hour day_of_month day_of_week
Arguments:
Check the manual
for - Transfer speed, Restart Mode, Checksum, Ops (Outstanding) suffix,
Visibility interval, TCP window size
snapmirror status:
-l displays the long
format of the output
-q displays which volumes or qtrees are
quiesced or quiescing
Listing SnapMirror
Snapshot Copies:
Use:
snap list
SnapMirror Snapshot copies are distinguished by their
naming convention, for example*:
DEST(0012345678)_vol01.0
*destination_system(sysid)_volume.number
Note: If SnapMirror
Snapshot copies are deleted, affected relationships will have to be
re-initialized!
SnapMirror Log
Files:
options snapmirror.log.enable
on/off
Note 1: default is
on
Note 2: location /etc/logs/snapmirror
Converting a
Replica to a Writable File System:
This is done on the
destination:
snapmirror quiesce
/vol/DEST_VOL/DEST_QTREE
snapmirror break /vol/DEST_VOL/DEST_QTREE
Re-synchronizing a
Broken-off Relationship:
This is done on the
system with the less up-to-date file system:
snapmirror resync
DEST_HOSTNAME:DEST_VOL
Making a Break
Permanent:
SRC> snapmirror
destinations SRC_VOL
SRC> snapmirror
release SRC_VOL DST_HOSTNAME:DST_VOL
Note: Remember to
remove the entry from the /etc/snapmirror.conf file!
Snapmirror
Migrate:
The snapmirror
migrate command is run on the storage system which holds the source volume:
snapmirror migrate
SRC_HOSTNAME:SRC_VOL DST_HOSTNAME:DST_VOL
This stops NFS and
CIFS on the source, migrates NFS file handles to the destination, makes the
source restricted, and makes the destination volume read-write.
Section 2/2:
Procedures
Procedure 1: How
to Create SnapMirror Relationships
Note 1: snapmirror
and snapmirror_sync licenses have already been added to SRC and DES, and D2 has
the snapmirror license.
Note 2: Source
volume has been created.
Note 3: Here we
have two destinations to create a cascaded relationship from SRC -> DES
-> D2.
Verify volumes are
created and online:
SRC> vol status
Specify hostnames
of the SnapMirror destination systems:
SRC> options
snapmirror.access host=DES,D2
Create volume on
destination (DES):
DES> vol create vol1
aggr1 10g
Set volume options:
DES> vol options
vol1 create_ucode on
DES> vol options
vol1 convert_ucode on
Restrict the
volume:
DES> vol restrict
vol1
Verify destination
volumes are restricted:
DES> vol status
Initialize the
SnapMirror:
DES> snapmirror
initialize -S SRV:vol1 DES:vol1
Monitor the status
of the transfer:
DES> snapmirror
status
Create (or edit)
the snapmirror.conf file:
DES> wrfile
/etc/snapmirror.conf
SRC:vol1 DES:vol1 - sync
{Ctrl C exits
wrfile}
Verify the
relationships are in sync:
DES> snapmirror
status -l
List the snapshot
copies:
DES> snap list vol1
Authorize the
second destination system:
DES> options
snapmirror.access host=D2
Create volume on
destination (D2):
D2> vol create vol1
aggr1 10g
Set volume options:
D2> vol options
vol1 create_ucode on
D2> vol options
vol1 convert_ucode on
Restrict the
volume:
D2> vol restrict
vol1
Verify destination
volumes are restricted:
D2> vol status
Initialize the
SnapMirror:
D2> snapmirror
initialize -S DES:vol1 D2:vol1
Monitor the status
of the transfer:
D2> snapmirror
status
Create (or edit)
the snapmirror.conf file:
D2> wrfile
/etc/snapmirror.conf
DES:vol1 D2:vol1 - 0-59/5***
{Ctrl C exits
wrfile}
Verify the
relationships are in sync:
D2> snapmirror
status -l
List the snapshot
copies:
D2> snap list vol1
Back on SRC!
Verify the status
of the SnapMirror relationships:
SRC> snapmirror
status
List the snapshot
copies:
SRC> snap list vol1
List all the
snapmirror destinations:
SRC> snapmirror
destinations
Read the snapmirror
log:
SRC> rdfile
/etc/log/snapmirror
Here we convert a
snapmirror sync to semi-sync!
Verify the status
of the SnapMirror relationships:
DES> snapmirror
status
Display the
contents of snapmirror.conf:
DES> rdfile
/etc/snapmirror.conf
Modify the contents
of snapmirror.conf:
DES> wrfile /etc/snapmirror.conf
SRC:vol1 DES:vol1
outstanding=10s sync
{Ctrl C exits
wrfile}
Note: When the
snapmirror.conf file is edited, SnapMirror drops to Async mode (replicates once
each minute.)
Verify the status
of the SnapMirror relationships:
DES> snapmirror
status
Back on SRC!
Verify the status
of the SnapMirror relationships:
SRC> snapmirror
status
Read the snapmirror
log:
SRC> rdfile
/etc/log/snapmirror
Procedure 2: How
to Configure SnapMirror to Support Multiple Paths
To display network
interface configuration:
SRC> ifconfig -a
Read the hosts
file:
SRC> rdfile
/etc/hosts
Note: Each
interface should have a hosts entry (source and destination) like SRC-e0a and
SRC-e0b and
Clear the
statistics of network interfaces e0a and e0b:
SRC> ifstat -z e0a
SRC> ifstat -z e0b
On the destination!
To display network
interface configuration:
DES> ifconfig -a
Read the hosts
file:
DES> rdfile
/etc/hosts
Edit the
snapmirror.conf file to add a connection name line:
DES> wrfile
/etc/snapmirror.conf
SRC_conf = multi
(SRC-e0a,DES-e0a) (SRC-e0b,DES-e0b)
SRC_conf:vol1 DES:vol1 - sync
{Ctrl C exits
wrfile}
Verify the status
of the SnapMirror relationships:
DES> snapmirror
status
On the source!
Use ifstat to
verify the data transfer is occurring on both network interfaces:
SRC> ifstat e0a
SRC> ifstat e0b
Continued …
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