EMC Storage Product Knowledge Sharing

A multipath requirement for different storage arrays:-All storage arrays: - Write cache must be disabled if not battery backed.Topology: - No single failure should cause both HBA and SP failover, especially with active-passive storage arrays.IBM TotalStorage DS 400 Family (formely FastT) –Defaul host type must be LNXCL or Host Type must be LNXCL orAVT (Auto Volume Transfer) is disabled in this host mode.HDS 99xx and 95xx family – HDS 9500V family (Thunder)- Requires two host modes:Host mode 1 – standardHost mode 2 – Sun...

The following major configuration steps for the storage, server and switches necessary for implementing the CLARiiON.Install Fibre Channel HBAs in all systemsInstall EMC CLARiiON LP8000 port driver ( For Emulex) on all systemConnect each host to both switches ( Broace/Cisco/McData)Connect SP1-A and SP2-A to the first switchConnect SP1-B and SP2-B to the second switchNote:- You can use cross SP connection for HA and connect SPA1 and SPB1 to first switch and SPB2 and SPA2 to the second switch.Install Operating System on windows/solaris/linux/Vmware...

Single-initiator zoning rule :--Each HBA port must be in a separate zone that contains it and the SP ports with which it communicates. EMC recommends single-initiator zoning as a best practice.Fibre Channel fan-in rule:--A server can be zoned to a maximum of 4 storage systems.Fibre Channel fan-out rule:-The Navisphere software license determines the number of servers you can connect to a CX3-10c, CX3-20c,CX3-20f, CX3-40c, CX3-40f, or CX3-80 storage systems. The maximum number of connections between servers and a storage system...

I have been receiving mail to write on basic storage topic rather than only EMC. Here is first basic thing to know about FC technology.Fibare Channel is nothing but just a medium to connect host and shared storage. When we talk about SAN first things comes in mind about Fibre Channel.Fibre Channel is serial data transfer interface intended for connecting shared storage to computer. Where storage is not connected physically to host.Why FC is most important in SAN? Because FC gives you high speed through the following process:1)...

There are different type of SAN like IP SAN, NAS over SAN etc... We will discuss about Fibre Channel SAN. It gives you more option in order to manage and minimize downtime means reducing company cost.In general if you think storage environments, physical interfaces to storage consisted of parallel SCSI channels supporting a small number of SCSI devices. With Fibre Channel, the technology provides a means to implement robust storage area...

SUN/SOLARIS___________To display what HBA's are installed.#prtdiag -v#dmesg#cat /var/adm/messages grep -i wwn moreTo set the configuration you must carry out the following:-changes to the /etc/system file-HBA driver modifications-Persistent binding (HBA and SD driver config file)-EMC recommended changes-Install the Sun StorEdge SAN Foundation packageChanges to /etc/system: ( Plz ignore 3 equal sign when u edit the file)SCSI throttle === set sd:sd_max_throttle=20Enable wide SCSI === set scsi_options=0x7F8SCSI I/O timeout value...

LUN Basics Simply stated, a LUN is a logical entity that converts raw physical disk space into logical storage space that a host server's operating system can access and use. Any computer user recognizes the logical drive letter that has been carved out of their disk drive. For example, a computer may boot from the C: drive and access file data from a different D: drive. LUNs do the same basic job. "LUNs differentiate between different chunks of disk space. "A LUN is part of the address of the storage that you're presenting...

EMC recommends no more than four connectrix switches per fabric based on the following formulae:One Switch -32 Total ports- 4 ports reserved for card failure28 ports remaining.- (int(28/5)) No more than 4:1 ratio, hosts : fa23 Possible host connections-2 to support multi-pathing-11 total host connectionsTwo Switch- 64 Total ports- 4 ports reserved for card failure- 4 ports reserved for E_ports- 56 ports remaining.-(int(56/5)) No more than 4:1 ratio, hosts : fa-45 Possible host connections-/ 2 to support multi-pathing22 host...

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