Single disk failure |
No |
No |
Yes |
Yes |
Double disk failure (2 disks fail in same RAID group) |
Yes, unless you are using SyncMirror or RAID-DP, then no. |
Maybe. If root volume has double disk failure, or if the mailbox disks are affected, no failover is possible. |
No, unless you are using RAID-DP or SyncMirror, then yes. |
No, unless you are using RAID-DP or SyncMirror, then yes. |
Triple disk failure (3 disks fail in same RAID group) |
Maybe. If SyncMirror is being used, no takeover occurs; otherwise, yes. |
Maybe. If root volume has triple disk failure, no failover is possible. |
No |
No |
Single HBA (initiator) failure, Loop A |
Maybe. If SyncMirror or multipath HA is in use, then no; otherwise, yes. |
Maybe. If root volume has double disk failure, no failover is possible. |
Yes, if multipath HA or SyncMirror is being used. |
Yes, if multipath HA or SyncMirror is being used, or if failover succeeds. |
Single HBA (initiator) failure, Loop B |
No |
Yes, unless you are using SyncMirror or multipath HA and the mailbox disks are not affected, then no. |
Yes, if multipath HA or SyncMirror is being used. |
Yes, if multipath HA or SyncMirror is being used, or if failover succeeds. |
Single HBA initiator failure (both loops at the same time) |
Yes, unless the data is mirrored on a different (up) loop or multipath HA is in use, then no takeover needed. |
Maybe. If the data is mirrored or multipath HA is being used and the mailbox disks are not affected, then no; otherwise, yes. |
No, unless the data is mirrored or multipath HA is in use, then yes. |
No failover needed if data is mirrored or multipath HA is in use. |
AT-FCX failure (Loop A) |
Only if multidisk volume failure or open loop condition occurs, and neither SyncMirror nor multipath HA is in use. |
Maybe. If root volume has double disk failure, no failover is possible. |
No |
Yes, if failover succeeds. |
AT-FCX failure (Loop B) |
No |
Maybe. If SyncMirror or multipath HA is in use, then no; otherwise, yes. |
Yes, if multipath HA or SyncMirror is in use. |
Yes |
IOM failure (Loop A) |
Only if multidisk volume failure or open loop condition occurs, and neither SyncMirror nor multipath HA is in use. |
Maybe. If root volume has double disk failure, no failover is possible. |
No |
Yes, if failover succeeds. |
IOM failure (Loop B) |
No |
Maybe. If SyncMirror or multipath HA is in use, then no; otherwise, yes. |
Yes, if multipath HA or SyncMirror is in use. |
Yes |
Shelf (backplane) failure |
Only if multidisk volume failure or open loop condition occurs, and data isn’t mirrored. |
Maybe. If root volume has double disk failure or if the mailboxes are affected, no failover is possible. |
Maybe. If data is mirrored, then yes; otherwise, no. |
Maybe. If data is mirrored, then yes; otherwise, no. |
Shelf, single power failure |
No |
No |
Yes |
Yes |
Shelf, dual power failure |
Only if multidisk volume failure or open loop condition occurs and data is not mirrored. |
Maybe. If root volume has double disk failure, or if the mailbox disks are affected, no failover is possible. |
Maybe. If data is mirrored, then yes; otherwise, no. |
Maybe. If data is mirrored, then yes; otherwise, no. |
Controller, single power failure |
No |
No |
Yes |
Yes |
Controller, dual power failure |
Yes |
Yes, until power is restored. |
No |
Yes, if failover succeeds. |
HA interconnect failure (1 port) |
No |
No |
Not applicable |
Yes |
HA interconnect failure (both ports) |
No |
Yes |
Not applicable |
Yes |
Ethernet interface failure (primary, no interface group) |
Yes, if set up to do so. |
No |
Yes |
Yes |
Ethernet interface failure (primary, interface group) |
Yes, if set up to do so. |
No |
Yes |
Yes |
Ethernet interface failure (secondary, interface group) |
Yes, if set up to do so. |
No |
Yes |
Yes |
Ethernet interface failure (interface group, all ports) |
Yes, if set up to do so. |
No |
Yes |
Yes |
Tape interface failure |
No |
No |
Yes |
Yes |
Heat exceeds permissible amount |
Yes |
No |
No |
No |
Fan failures (disk shelves or controller) |
No |
No |
Yes |
Yes |
Reboot |
Yes |
No |
No |
Yes, if failover occurs. |
Panic |
Yes |
No |
No |
Yes, if failover occurs. |