EMC Storage Product Knowledge Sharing

Lets discuss about LUNz/LUN_Z in Operating System specially in CLARiiON environment. We know that what is LUN?? LUN is nothing but logical slice of disc which stands for Logical Unit Number. This terminology comes with SCSI-3 group, if you want to know more just visit www.t10.org and www.t11.orgA SCSI-3 (SCC-2) term defined as "the logical unit number that an application client uses to communicate with, configure and determine information about an SCSI storage array and the logical units attached to it. The LUN_Z value shall...

Lets discuss about most important thing in SAN environment ZONING. Zoning is the only way to restrict access for storage to all the host. We will be discussing about Zoning in details.There are two type of Zoning basically : Hard Zoning and Soft Zoning. Lets first define what is Zoning??Zoning is nothing but map of host to device to device connectivity is overlaid on the storage networking fabric, reducing the risk of unauthorized access.Zoning supports the grouping of hosts, switches, and storage on the SAN, limiting access...

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)...

When running inq or syminq, you'll see a column titled Ser Num. This column has quite a bit of information hiding in it. An example syminq output is below. Your output will differ slightly as I'm creating a table from a book to show this; I don't currently have access to a system where I can get the actual output just yet.Device Product Device ------------------------ ---------- ---------------------- ----------------------...

SYMCLI BASE Commandssymapierr - Used to translate SYMAPI error code numbers into SYMAPI error messages.symaudit - List records from a symmetrix audit log file.symbcv - Perform BCV support operations on Symmetrix BCV devices.symcfg - Discover or display Symmetrix configuration information. Refresh the host's Symmetrix database file or remove Symmetrix info from the file. Can also be used to view or release a 'hanging' Symmetrix exclusive lock.symchg ...

MDS Interoperability Mode Limitations When a VSAN is configured for the default interoperability mode, the MDS 9000 Family of switches is limited in the following areas when interoperating with non-MDS switches: • Interop mode only affects the specified VSAN. The MDS 9000 switch can still operate with full functionality in other non-interop mode VSANs. All switches that partake in the interoperable VSAN should have that VSAN set to interop mode, even if they do not have...

What are the CLARiiON SAN fan-in and fan-out configuration rules?"Fan-In Rule: A server can be zoned to a maximum of four storage systems. Fan-Out Rule: For FC5300 with Access Logix software - 1 - 4 servers (eight initiators) to 1 storage system. For FC4500 with Access Logix - 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 - 32 initiators per SP port for a maximum of 128 initiators per FC4700....