Wednesday, 21 December 2016

ARL Headswap: Part 1/4 - Preparation

Performing a non-disruptive ARL (Aggregate Relocate) Headswap for NetApp Clustered Data ONTAP - Step-by-Step Walkthrough Series:

Caveat Lector: Unofficial information!

0) Introduction

At a high-level, the steps involved in the ARL process are:

1) Due Diligence
2) Prepare New Controllers
3) Prepare Existing Cluster and Controllers

4) Use ARL to Relocate Aggregates from NODE-A to NODE-B
5) Record NODE-A info
6) Migrate Data LIFs off NODE-A
7) Handle NODE-A’s Other LIFs and Networking
8) Disable SFO
9) Retire NODE-A

10) Replace NODE-A with NODE-C
11) Return Data LIFs to NODE-C
12) Handle NODE-C’s Other LIFs
13) Use ARL to Relocate Aggregates from NODE-B to NODE-C
14) Record NODE-B info
15) Migrate Data LIFs off NODE-B
16) Handle NODE-B’s Other LIFs and Networking
17) Retire NODE-B

18) Replace NODE-B with NODE-D
19) Return data LIFs to NODE-D
20) Handle NODE-D’s Other LIFs
21) Use ARL to Relocate (Selected) Aggregates to NODE-D
22) Re-Enable SFO

23) ARL Finishing Touches
24) Test Failover

Image: ARL Headswap Process
Note 1: This series doesn’t cover all scenarios (i.e. V-Series, Storage Encryption ...)
Note 2: To keep this post short I only include key commands. Advanced ONTAP skills are a pre-requisite in order to perform the ARL headswap.

1) Due Diligence

1.1) Information Gathering and Planning
Gather the following information:
- Existing Cluster Information
- New Controllers Information
- Platform Mixing Rules Verification (from HWU) - for 4+ node clusters
- On-Board Ports for Old Controllers (from HWU)
- On-Board Ports for New Controllers (from HWU)
- Cards in Old Controllers
- Slot Configuration for New Controllers
- Mapping Physical Ports on Old Controllers to Physical Ports on New Controllers
IMPORTANT: At least one cluster port needs to map (at least temporarily) from Old to New Controllers (see Scenario 5 of When Ports Go Missing)
- Physical Networking on Old Controllers (ports, IFGRPs, VLANs)
- Logical Networking on Old Controllers (failover-groups, broadcast domains)
- LIFs (Logical Interfaces) on Old Controllers
- Licenses on Old Controllers
- Licenses for New Controllers
- Service Processor Info
- Non-Root (Data) Aggregates
Note: This is not an exhaustive list.

1.2) Verify AutoSupports and perform any required remediation(s)
1.3) Verify Config Advisor outputs and perform any required remediation(s)

1.4) Obtain software images as required
Note: Recommend using the exact same version (including P/D release on the new controllers.)

1.5) Obtain official ARL headswap documentation
Read and understand the process!

1.6) Obtain FAS/AFF controller documentation set
1.7) Obtain ONTAP documentation set

1.8) Site Verification (via customer/site-survey)
- Rack space for new controllers
- Access to cabs
- Available power
- Cable lengths, SFPs, I/O cards...
Note: This is not an exhaustive list.

2) Prepare New Controllers

2.1) Power on New Controllers
Interrupt the boot process by pressing Ctrl-C to access the LOADER> environment
IMPORTANT: If you get a warning “The (NVRAM) battery is unfit to retain data”, allow the battery to charge (do not override).
On both controllers, with no disks attached, run from LOADER>

setenv bootarg.init.boot_clustered true
setenv AUTOBOOT false
boot_ontap prompt

Note: We set AUTOBOOT to false to give more control over the boot process (we set it back to true after the ARL). To boot normally type> boot_ontap

2.2) System Images
Upgrade/downgrade both software images using boot menu selection 7 “Install new software first.”

2.3) Wipeconfig (Used Controllers Only)
If either of the controllers was previously used, run wipeconfig from the boot menu:

Selection (1-8)? wipeconfig

Let the controller reboot. The wipeconfig is successful if you see:

The boot device has changed. System configuration information could be lost. Use option (6) to restore the system configuration, or option (4) to initialize all disks and setup a new system.
Normal Boot is prohibited.

Note: If you are upgrading to a system with both nodes in the same chassis, install both nodes in the chassis. Both nodes can be left on the LOADER> prompt.

IMPORTANT NOTE: Switchless Clusters
If you’re headswapping a switchless cluster, be mindful of the bootvar setting -
- if defaults to false, so if this is not set to true on both replacement heads (in the switchless cluster) prior to boot, it’s a support case.

3) Prepare Existing Cluster and Controllers

3.1) Install licenses for new controllers

3.2) Verify Storage Encryption is disabled*
*storage encryption is not covered in this guide

(pre__8.3.1)::> node run NODENAME -command disk encrypt show
(post_8.3.1)::> security key-manager show -status

3.3) (For 4+ node cluster) Verify Epsilon not on the HA-pair being ARL-ed
If it is then move epsilon::>

set -c off; set adv; cluster show
cluster modify -node NODE_WITH_EPSILON -epsilon false
cluster modify -node NODE_NOT_BEING_ARL-ed -epsilon true

3.4) Verify Cluster and Nodes::>

cluster show
set -c off; set adv
cluster ping-cluster -node NODE-A
cluster ping-cluster -node NODE-B
system node image show -node NODE-A,NODE-B -iscurrent true

3.5) Verify Storage Failover::>

storage failover show

3.6) (For 2 node cluster) Verify Cluster HA::>

cluster ha show

3.7) Verify aggregates are owned by their home node::>

storage aggregate show -nodes NODE-A -is-home false -fields owner-name,home-name,state
storage aggregate show -nodes NODE-B -is-home false -fields owner-name,home-name,state

3.8) Verify disks::>

storage failover show -node NODE-A,NODE-B -fields local-missing-disks,partner-missing-disks
storage disk show -nodelist NODE-A,NODE-B -broken

3.9) Data Collection
Note: This is far from an exhaustive list. The idea is a snapshot of information which can be used for comparison purposes later on.

storage aggregate show -node NODE-A -state online
storage aggregate show -node NODE-B -state online
volume show -node NODE-A -state offline
volume show -node NODE-B -state offline
ucadmin show -node NODE-A
ucadmin show -node NODE-B
system node service-processor show -node NODE-A -instance
system node service-processor show -node NODE-B -instance
event log show -messagename scsiblade.*

3.10) Node and Cluster Backups::>

security login unlock -username diag
security login password -username diag
set d
systemshell -node NODE-A
cp /mroot/etc/varfs.tgz /mroot/etc/varfs.bak
systemshell -node NODE-B
cp /mroot/etc/varfs.tgz /mroot/etc/varfs.bak
system configuration backup create -node NODE-A -backup-type node -backup-name ACheadswap
system configuration backup create -node NODE-B -backup-type node -backup-name BDheadswap
system configuration backup create -node NODE-A -backup-type cluster -backup-name clusbackup
job show -name *backup*

Wait for the backups to complete.

3.11) Send AutoSupports and Verify Sent Successfully::>

system node autosupport invoke -node NODE-A -type all -message "Starting ARL process"
system node autosupport invoke -node NODE-B -type all -message "Starting ARL process"
system node autosupport history show -node NODE-A
system node autosupport history show -node NODE-B

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