Manual Chapter :
Prepare for Data Collection Device Upgrade with Minimal Downtime
Applies To:
Show Versions
BIG-IQ Centralized Management
- 5.3.0
Prepare the data collection device cluster for upgrade with minimal downtime
If you choose the minimal downtime method, you can upgrade your data collection device cluster minimizing the time that the cluster is offline.
Important: You cannot perform the
minimal downtime upgrade unless you have at least 3 DCDs in your cluster.
Check the statistics retention policy
Before you begin an update with
minimal downtime, you must confirm that your statistics data is replicated to multiple
DCDs. Perform this task on the primary BIG-IQ® system.
Note: Perform this task only if you are upgrading from version 5.2 to
version 5.3.
Check data collection device health for version 5.2
You
can use the BIG-IQ Data Collection screen to review the overall health and status of the
data collection devices you've configured. You can use the data displayed on this screen
both before and after an upgrade to verify that your data collection device cluster
configuration is as you expect it to be.
Note: Perform this task only if you are upgrading from version 5.2 to
version 5.3.
Confirm disk space is sufficient for minimal downtime upgrade
As part of preparing to upgrade your
data collection device with minimal downtime, you must confirm that there is sufficient
disk size in the cluster so that when you take a DCD offline, there is room for its data
on other devices in the cluster. If the amount of free space in the cluster is less than
the amount of data on any one node, then there is insufficient space to upgrade without
downtime. If this is the case, you need to either add DCDs or increase storage space on
the existing DCDs.
Important: If your cluster has multiple zones, you must
perform the disk space check for each zone.
If there is sufficient space, you
can proceed. Otherwise, you need to either add DCDs, or add DCD storage space.
Confirm that BIG-IP DCD configuration is correct
In preparing to upgrade your data
collection device with minimal downtime, you must confirm that the
BIG-IP® device to DCD configuration is
correct,
so that when a particular DCD is upgraded, data that was being routed to
it is
automatically routed to another DCD in the cluster. There are two settings of particular
concern:
- Confirm that data sent from the BIG-IP devices is not being sent to just one DCD. Each BIG-IP device must be configured to send data to multiple DCDs.
- Confirm that the BIG-IP devices are configured with appropriate monitors that allow for traffic to switch to a different DCD when one DCD is taken offline.
Confirm correct minimum master devices setting for version 5.2
In preparing to upgrade your data
collection device with minimal downtime, you must confirm that the minimum master
devices setting is correctly configured so that when a DCD is upgraded, its data can
fail over to another DCD in the cluster.
Stop snapshot creation
Because of the mixed software
version environment that occurs during the upgrade process, if snapshot schedules are
configured for the cluster, you should stop creating snapshots before you begin the
upgrade to prevent possible issues with your data.