EMC CX600 Configuration Guide - Page 10

Paths from a Server to an SP - specifications

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February 3, 2003 EMC CLARiiON Open Systems Configuration Guide For CX2001 15 initiators per SP, each with a maximum of one (single) path to an SP; maximum of 15 servers. For CX600 32 initiators per SP port and maximum of 256 initiators per CX600 available for server connections. Ports 0, 1, 2, and 3 on each SP in any CX600 handle server connections. Port 3 on each SP in a CX600 with MirrorView also handles remote mirror connections. In a remote mirror configuration, each path between SP A port 3 on one storage system and SP A port 3 on another storage system counts as one initiator for each port 3. Likewise, each path between SP B port 3 on one storage system and SP B port 3 on another storage system counts as one initiator for each port 3. For FC4500 with Access Logix or FC4700 with Base or Access Logix software 8.41.xx or lower 15 servers to 1 storage system; each server with a maximum of one (single) path to an SP. For FC4700 with Base or Access Logix software 8.42.xx or higher or for CX400 32 initiators per SP port for a maximum of 128 initiators per CX400 or FC4700. Each port on each SP supports 32 initiators. Ports 0 and 1 on each SP in a CX400 or FC4700 handles server connections. Port 1 on each SP in a CX400 or FC4700 with MirrorView also handles remote mirror connections. In a remote mirror configuration, each path between SP A port 1 on one storage system and SP A port 1 on another storage system counts as one initiator for each port 1. Likewise, each path between SP B port 1 on one storage system and SP B port 1 on another storage system counts as one initiator for each port 1. For FC5300 with Access Logix software2 4 servers (eight initiators) to 1 storage system. Paths from a Server to an SP Access from a server to a Storage Processor (SP) in a storage system can be either single path, multi-path, or alternate path. Cabling HBA ports, SP ports, and optional switch fabrics in specific ways, enables paths from a server to an SP. Switch zoning allows the paths and enforces the paths rules. Note: Some HBAs have two ports. Each port that is zoned to a port on an SP is one path to that SP and the storage system containing that SP. Depending on the type of storage system and the connections between its SPs and the switch fabric, an HBA port can be zoned through different switch ports to the same SP port or to different SP ports, resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the failover software running on the server may limit the number of paths supported from the server to a single storage-system SP and from a server to the storage system. Refer to the Path Rules (page 11). Single Path - A server has only one path to one or both storage processors (SPs) in a storage system. All I/O to a LUN is sent down the path to SP that owns the LUN. Multi-Path - A server with multiple active paths to an SP in the storage system. The server can use each path to send I/O to the same LUN (a LUN is owned by a specific SP). Supporting multiple paths to an SP also allows dynamic load balancing, which distributes I/O to a LUN across the multiple paths to the SP that owns the LUN. PowerPath distributes I/O across multiple paths using one of several user-selectable algorithms. Multi-path ATF distributes I/O across multiple paths using a "round-robin" algorithm. Alternate Path - A server has more than one path to each SP in the storage system, but only one is active. Each HBA in the server can have more than one path to the storage system, but the server can use only one HBA port (the primary) for I/O to a LUN. If the primary path becomes unavailable, the server uses the HBA ports designated as "alternates" to that SP. Alternate path access is effectively equivalent to multi-path access with dynamic load balancing disabled. Some operating systems (such as HP-UX PVLinks and IRIX) support static load balancing by letting you assign a primary path to each LUN. With static load balancing, I/O occurs over the primary path only (the alternate paths are for failover only). 1. CX200 storage systems available from selected channels only. 2. FC5300 SAN configuration available from selected channels only; MIA required for optical connect. Document Rev 19 Page 10 EMC Confidential

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February 3, 2003
EMC CLARiiON Open Systems Configuration Guide
Document Rev
19
Page 10
EMC Confidential
For CX200
1
15 initiators per SP, each with a maximum of one (single) path to an SP; maximum of 15 servers.
For CX600
32 initiators per SP port and maximum of 256 initiators per CX600 available for server connections. Ports 0, 1, 2,
and 3 on each SP in any CX600 handle server connections. Port 3 on each SP in a CX600
with
MirrorView also handles
remote mirror connections.
In a remote mirror configuration, each path between SP A port 3 on one storage system
and SP A port 3 on another storage system counts as one initiator for each port 3. Likewise, each path between SP
B port 3 on one storage system and SP B port 3 on another storage system counts as one initiator for each port 3.
For FC4500 with Access Logix or FC4700 with Base or Access Logix software 8.41.xx or lower
15 servers to 1 storage system; each server with a maximum of one (single) path to an SP.
For FC4700 with Base or Access Logix software 8.42.xx or higher or for CX400
32 initiators per SP port for a maximum of 128 initiators per CX400 or FC4700. Each port on each SP supports 32
initiators. Ports 0 and 1 on each SP in a CX400 or FC4700
handles server connections. Port 1 on each SP in a CX400
or FC4700
with
MirrorView also handles remote mirror connections. In a remote mirror configuration, each path
between SP A port 1 on one storage system and SP A port 1 on another storage system counts as one initiator for
each port 1. Likewise, each path between SP B port 1 on one storage system and SP B port 1 on another storage
system counts as one initiator for each port 1.
For FC5300 with Access Logix software
2
4 servers (eight initiators) to 1 storage system.
Paths from a Server to an SP
Access from a server to a Storage Processor (SP) in a storage system can be either single path, multi-path, or
alternate path. Cabling HBA ports, SP ports, and optional switch fabrics in specific ways,
enables
paths from a
server to an SP. Switch zoning
allows
the paths and
enforces
the paths rules.
Note:
Some HBAs have two ports. Each port that is zoned to a port on an SP is one path to that SP and the storage
system containing that SP. Depending on the type of storage system and the connections between its SPs and the
switch fabric, an HBA port can be zoned through different switch ports to the same SP port or to different SP ports,
resulting in multiple paths between the HBA port and an SP and/or the storage system. Note that the failover
software running on the server may limit the number of paths supported from the server to a single storage-system
SP and from a server to the storage system. Refer to the
Path Rules
(page 11).
Single Path
- A server has only one path to one or both storage processors (SPs) in a storage system. All I/O to a
LUN is sent down the path to SP that owns the LUN.
Multi-Path
- A server with multiple active paths to an SP in the storage system. The server can use each path to
send I/O to the same LUN (a LUN is owned by a specific SP). Supporting multiple paths to an SP also allows
dynamic load balancing, which distributes I/O to a LUN across the multiple paths to the SP that owns the LUN.
PowerPath distributes I/O across multiple paths using one of several user-selectable algorithms. Multi-path ATF
distributes I/O across multiple paths using a
“
round-robin
”
algorithm.
Alternate Path
- A server has more than one path to each SP in the storage system, but only one is active. Each
HBA in the server can have more than one path to the storage system, but the server can use only one HBA port
(the primary) for I/O to a LUN. If the primary path becomes unavailable, the server uses the HBA ports
designated as
“
alternates
”
to that SP. Alternate path access is effectively equivalent to multi-path access with
dynamic load balancing disabled. Some operating systems (such as HP-UX PVLinks and IRIX) support static load
balancing by letting you assign a primary path to each LUN. With static load balancing, I/O occurs over the
primary path only (the alternate paths are for failover only).
1.
CX200 storage systems available from selected channels only.
2.
FC5300 SAN configuration available from selected channels only; MIA required for optical connect.