HP StorageWorks MSA1510i HP StorageWorks 1510i Modular Smart Array iSCSI conce
HP StorageWorks MSA1510i Manual
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- HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 1
HP StorageWorks 1510i Modular Smart Array iSCSI concepts and deployment guide active/active firmware v2.x Part number: 431338-002 Second edition: May 2008 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 2
contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 3
Contents About this guide 5 Intended audience 5 Related documentation 5 Document conventions and symbols 6 HP technical support 6 HP installation and configuration assistance 7 Customer self repair 7 Product warranties 7 Subscription service 7 HP websites 7 Documentation feedback 7 1 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 4
multipathing rules 39 Path validation 39 Example multipath configuration 40 5 Available monitoring tools 43 HP Systems Insight Manager 43 SNMP service settings 43 Ethernet network traffic or protocol analyzer 44 6 Security 45 Physical security 45 Network security 45 System security 45 Data - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 5
, and troubleshooting information. Intended audience This guide is intended guide • HP StorageWorks 1510i Modular Smart Array maintenance and service guide These documents are available on the MSA1510i Support CD, v2.0 or later, available on the MSA1510i support page: http://www.hp.com/go/support - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 6
: Provides clarifying information or specific instructions. NOTE: Provides additional information. TIP: Provides helpful hints and shortcuts. HP technical support For worldwide technical support information, see the HP support website: http://www.hp.com/support. Before contacting HP, collect the - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 7
information website: http://www.hp.com/go/storagewarranty. Subscription service HP recommends that you register your product at the http://www.hp.com/service_locator • http://www.hp.com/support/manuals • http://www.hp.com/support/downloads Documentation feedback HP welcomes your feedback. To make - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 8
8 About this guide - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 9
, where clients of a SCSI interface are called initiators. Initiators issue SCSI commands to request services from targets. Targets are typically components, or logical units, on a server. A SCSI transport used transport protocols: 1510i Modular Smart Array iSCSI concepts and deployment guide 9 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 10
IP datagrams. The IP datagrams are then moved through the TCP/IP stack and transported over the network between the SCSI services layer of host systems and the SCSI services layer of target storage devices. The iSCSI protocol works seamlessly over TCP/IP networks without requiring any changes to TCP - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 11
. • Discovery Session-a session only opened for target discovery. The following image illustrates an iSCSI session: newpage pi 1510i Modular Smart Array iSCSI concepts and deployment guide 11 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 12
iSCSI login overview The iSCSI login enables: • A TCP connection for iSCSI use • Authentication of the parties • Negotiation of the session's parameters • Marking the connection as belonging to an iSCSI session An iSCSI session is established to identify all of the connections between an initiator - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 13
two iSCSI nodes (targets in this case) sharing network portals within the same network entity. newpage pi 1510i Modular Smart Array iSCSI concepts and deployment guide 13 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 14
Portal Groups - a set of network portals within a network entity that share network connections and can collectively coordinate an iSCSI session. Target Portal Group - Although iSCSI initiators and iSCSI targets use portal groups to coordinate iSCSI sessions, only target portal groups are used - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 15
to each MSA storage target using an industry-standard format. One or more IP addresses must manually be assigned to each target through MSA firmware or software tools. These fundamental iSCSI concepts LCD display panel push buttons 1510i Modular Smart Array iSCSI concepts and deployment guide 15 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 16
Rear view 1. 2-Port Ethernet iSCSI module (for the controller in slot 1) 2. Chassis slot diagram 3. Blank for optional 2-Port Ethernet iSCSI module (for the controller in slot 2) 4. Power supply module 2 5. Power supply module 1 6. SCSI I/O module (bus 0) 7. Blank for optional SCSI I/O module (bus - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 17
each controller has two physical ports, there are four system-defined logical ports for each controller. 1510i Modular Smart Array iSCSI concepts and deployment guide 17 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 18
IETF zeroconf mechanism (169.254.xxx.xxx). If desired, you can manually assign or change the MSA1510i active management port IP addresses to static IP Command Line Interface, or the DHCP server. Available management services The following services may be enabled or disabled and assigned a different - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 19
HP Systems Insight Manager, can connect to this service on the MSA1510i if it knows the SNMP community string (default is "public"). Management port NTP support Management port configuration options include a provision ). newpage pi 1510i Modular Smart Array iSCSI concepts and deployment guide 19 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 20
firmware automatically assigns an IP address, you must manually assign IP addresses to each available storage port. that physical port. Consider: • The MSA1510i supports the ability to create multiple storage portals included in later sections of this guide. The following image illustrates a possible - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 21
, showing the storage portals with their TCP assignments Storage port gateway support If your network uses routers, the MSA1510i can support digests. For more information about setting up the default gateway, see (VLANs). newpage pi 1510i Modular Smart Array iSCSI concepts and deployment guide 21 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 22
details, see the HP Storage Management Utility user guide or the MSA1510i Command Line Interface user guide. These and other MSA1510i-specific user documents are provided on the MSA1510i Support CD, v2.0 or later, available on the MSA1510i Support website: http://www.hp.com/suppport. Targets An - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 23
available initiators through an iSCSI login discovery process. The MSA1510i supports the standard Send Targets discovery process, as well as SLP drives, see the Storage Management Utility user guide or the MSA1510i Command Line Interface user guide. These and other MSA1510i-specific user documents - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 24
• More complex configurations with multiple initiators need to control access to the storage and usually create multiple LUNs and multiple targets. Each initiator is then granted access to one or more specific targets. Targets may be shared among groups of initiators. For example, the following - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 25
servers, Ethernet NICs, and operating systems, see the MSA1510i Compatibility guide, available on the Manuals page of the MSA1510i Support website: http://www.hp.com/support. In multipath configurations, iSCSI Initiator software and the HP-approved multipath software is used to establish the - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 26
NOTE: HP strongly recommends enabling Spanning Tree on the switch ports as a means to identify and dynamically block certain switch ports that could create network loops. The following illustration shows using VLANs in a network with multiple servers to control access to an MSA1510i. A VLAN ID set - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 27
figuration information, see the add route command in the MSA1510i CLI User guide. (The IP is the address of the destination network, not the destination across multiple routers, HP strongly recommends that header and data digest support be enabled. Login parameters are pre-set with defaults, but these - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 28
Component MSA1510i Router Host MSA CLI commands: MA0 management port SA0 SA1 Port B1 Port B2 IP address 192.168.2.1 nl (default gateway: 192.168.2.25) 192.168.2.2 192.168.2.3 192.168.2.25 192.168.1.25 192.168.1.101 route add sa0 192.168.1.0/255.255.255.0 192.168.2.25 nl - or - route add sa0 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 29
. A PEM certificate was uploaded to the MSA1510i. See the Storage Management Utility user documents for instructions. Not used Used Not used Used - if the SNMP community string matches, a management tool, such management system. 1510i Modular Smart Array iSCSI concepts and deployment guide 29 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 30
iSCSI naming convention, such as "iqn.1986-03.hp.com.storage.msa". • Node names are encoded in the UTF8 character set. (The initiator service does not support UCS-4 characters.) RFC 2044 describes UTF8 encoding. • Uppercase characters are always mapped to lowercase. • Up to 32 targets can be defined - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 31
two portal groups, with a storage portal for each storage port associated with it, one for each controller. 1510i Modular Smart Array iSCSI concepts and deployment guide 31 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 32
Example configurations Example basic configurations The configurations outlined in the following table and illustrated in this section are examples of the basic capabilities of the standard-shipping, single-controller MSA1510i. Basic Configuration 1 Basic Configuration 2 Number of MSA1510i - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 33
PG1-Target1 PG1-Target2 N/A Target N/A Target1 Target2 N/A N/A N/A In this example, because only port A0 supports management (MA0), only Server 1 (which is connected to port A0) is able to perform management and con initiator. If 1510i Modular Smart Array iSCSI concepts and deployment guide 33 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 34
ACLs are not defined (as in Basic configuration 1), all initiators connected to a port can access all storage targets (and their mapped LUNs) associated with that port. Port MA0 SA0 SA1 Server 1 NIC Server 2 NIC Server 3 NIC Server 4 NIC IP Address 100.10.1.1 100.10.1.10 100.20.1.11 100.10.1.200 100 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 35
illustration are independent network domains. Port MA0 and 1 SA0 2 Port SA0 3 Port MB0 and 4 SB0 Port SB1 1510i Modular Smart Array iSCSI concepts and deployment guide 35 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 36
mapped LUNs. IMPORTANT: Multipath configurations must install the HP iSCSI MPIO DSM on each server with access to the MSA, to support MSA1510i controller failover. Advanced configuration 2 This dual-controller configuration includes the following advanced concepts: • Virtual LAN (VLAN) tagging is used - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 37
authentication should be enabled to ensure that only the intended server accesses its intended iSCSI target. CHAP 1510i Modular Smart Array iSCSI concepts and deployment guide 37 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 38
authentication is used to verify a password (a shared secret). For more information about CHAP authentication, see Data security. • Access Control Lists (ACLs) should be enabled for the target's mapped LUNs, with each server granted access to a specific LUN on the target. 38 MSA1510i configuration - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 39
management tools, link status, controller port status, controller ping support, and Device Manager available in Windows. Each of these tools the wrong number of devices are present, redundancy has failed. Before troubleshooting can begin, a basic understanding of what is expected in the guide 39 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 40
, one could conclude that one of the multipath devices only has one path to the array controller. The following tools can be used to troubleshoot issues: • The iSCSI initiator applet can be used to review path information to determine which target has been improperly connected or which failed path - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 41
: Port SA0 Port SA1 Target3 No failover support No failover support Target4 Port SB0 No failover support Port SB1 No failover support In this additional discussion, assume that Target3 : http://www.microsoft.com. 1510i Modular Smart Array iSCSI concepts and deployment guide 41 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 42
42 Multipathing - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 43
automatic discovery by a ping sweep or by manual entry of the MSA1510i management IP address. HP website: http://www.hp.com/go/sim. SNMP service settings An SNMP management system, such as HP the community string as appropriate. The MSA1510i supports sending SNMP traps to up to four guide 43 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 44
that can be used to monitor network traffic. Available on the Internet and downloaded to servers in the network, some of these tools have iSCSI support and are useful for troubleshooting simple issues, such as login negotiations. 44 Available monitoring tools - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 45
, always make use of the secure port for web traffic and SSH for the command line interface. 1510i Modular Smart Array iSCSI concepts and deployment guide 45 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 46
for the initiator. These passwords should match the standard practices for the environment and be rotated on a regular basis. • The Microsoft iSCSI Initiator supports both one-way and mutual CHAP. The usage model assumed by the Microsoft iSCSI initiator is that each target can have its own unique - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 47
7 Troubleshooting Problem Possible cause / solution Cannot connect to SMU management page Cannot connect to the CLI via Secure Shell or Telnet Cannot connect to match the name entered for the initiator in the MSA1510i SMU or CLI. 1510i Modular Smart Array iSCSI concepts and deployment guide 47 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 48
MSA controller maximum session count may have been exceeded. The controller supports a maximum of 32 sessions per controller. Log out of the original path due to a path problem on the redundant controller. • See Microsoft iSCSI Initiator troubleshooting information in this section. • Wrong IP - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 49
entered for NTP server. • NTP is not enabled on the Windows Server via the group policy editor. • See the MSA1510i Maintenance and Service Guide. • Enable animations to play in Internet Explorer's Internet Options. • Degraded mode arrays or array rebuild. • Too many initiators attached to the - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 50
50 Troubleshooting - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 51
commands and data across an IP network. iSCSI Device A SCSI device using an iSCSI service delivery subsystem. Service Delivery Subsystem is defined as a transport mechanism for SCSI commands and responses. iSCSI -to-target session. 1510i Modular Smart Array iSCSI concepts and deployment guide 51 - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 52
each time the computer is rebooted. This is generally desirable. The Microsoft iSCSI Initiator service supports the concept of persistent targets. By using common APIs and UI, the Microsoft iSCSI initiator service can configure software and hardware initiators to reconnect to a target whenever the - HP StorageWorks MSA1510i | HP StorageWorks 1510i Modular Smart Array iSCSI conce - Page 53
. Traffic segmentation is performed at the data link level. To implement VLAN tagging on the MSA1510i, the switch to which the MSA1510i is attached must support 802.1q encapsulation on the uplink (trunk) port. 1510i Modular Smart Array iSCSI concepts and deployment
HP StorageWorks
1510i Modular Smart Array iSCSI concepts
and deployment guide
active/active
fi
rmware v2.x
Part number: 431338–002
Second edition: May 2008