Quorum are failed to bring online after failover to other node

Dear All,

we have 2 node with SAN storage to form a cluster, after node A fail, failover cluster are tried to failover to node B, but the quorum drive are failed to bring online and the cluster also fail to online due to nodeanddiskmajority we have set.

after we checked the cluster log, it showed below error.

[RES] Physical Disk <Cluster Disk 4>: PR reserve failed, status 170
[RES] Physical Disk <Cluster Disk 4>: HardDiskpPRArbitrate: Error exit, unregistering key...
[RES] Physical Disk <Cluster Disk 4>: ResHardDiskArbitrateInternal: PR Arbitration for disk Error: 170.
Physical Disk <Cluster Disk 4>: ResHardDiskArbitrate: Internal arbitration returned status 170.

we need to force start the cluster net start clussvc /fq and Clear-ClusterDiskReservation -Disk 1 to bring the failover cluster online.

1) why the quorum drive has been reserved ?

2) how we can prevent this happen so the failover cluster will start without problem?

Thanks.

Benny