RAID and HA Flashcards
Configuring RAID Levels
Not all FAZ models support RAID
If RAID is supported, you can configure RAID on the RAID Management. Levels include Linear, RAID 0,1,1+spare,5,5+spare,6,6+spare,10,50,60
Level Names
0 = Striping
1 = Mirroring
5 = Distributed Parity
6 = Dual Parity
10 = Mirroring + Striping
50 = Striping and Distributed Parity
60 = Striping Distributed double parity
RAID Status
Can be one of the following:
Good - Functioning normally
Rebuilding - FAZ is writing data to a newly added hard drive to restore logical drive to an optimal state. Not fully fault tolerant until finished
Initializing - FAZ is writing to all the hard drives in the device in order to make the array fault tolerant.
Verifying - Ensuring the parity data of a redundant drive is valid
Degraded - Hard Drive is no longer being used by the RAID controller
Inoperable - One or more drives is missing - the drive is no longer available to the OS. Data in an inoperable state cannot be accessed.
Viewing RAID Failures and remediate failure? (Hardware/Software)
System Settings > Dashboard > Alert Message Console
Hardware RAID: Hot swap
Software RAID: Shut down then swap
Diagnosing RAID w commands
diagnose system raid status - RAID status, level, size, and hard disk info
# diagnose system raid hwinfo - RAIS controller hardware information
# diagnose system disk info - SMART info
# diagnose system disk health - SMART health status
# diagnose system disk errors - SMART error logs
on VM, only the diagnose system disk usage command is available
HA Summary
Applies real time redundancy. If primary fails, another is selected
Synchronizes logs and data securely among the HA. System and configuration settings applicable to the HA are also synced
Alleviates the load on primary by delegating processes to secondaries.
When FAZ devices have different licenses, the license that allows the smallest number of managed devices is used.
Active-Active
FAZ in this mode can form a cluster with devices on different subnets. All HA members can receive logs and archive files and forward to HA peers.
All HA members can forward their directly received logs and archive files to a remote server
Active-Passive
Requires layer 2 connectivity between devices to form cluster
Only HA primary can receive logs and archive files from directly connected devices and forward them to HA secondaries
Only the primary can forward their directly received logs and archive files to a remote server
HA Sync
Initial and Real-Time(Log Data)
HA monitoring commands
diagnose ha [command]
status, stats, dump-datalog, failover, force-cfg-resync, load-balance, restart-init-sync
this can also be seen in GUI under Cluster Status pane
HA Requirements
Maximum of four devices in HA (1 primary and 3 secondary) Must be same FAZ series, same firmware, and be visible to each other on the network. All must operate in same mode.
Disk space does not have to match, but must be big enough to store expected logs.
When running VM’s, all VMs must be same platform. Can’t have one on VMware and the other on KVM. ‘
