EMC Storage Product Knowledge Sharing

The Clariion Formats the disks in Blocks. Each Block written out to the disk is 520 bytes in size. Of the 520 bytes, 512 bytes is used to store the actual DATA written to the block. The remaining 8 bytes per block is used by the Clariion to store System Information, such as a Timestamp, Parity Information, Checksum Data. Element Size – The Element Size of a disk is determined when a LUN is bound to the RAID Group. In previous versions of...

In order to use the control functions of Solutions Enabler, you must create device groups and add/associate Symmetrix devices with the group. The following example shows how to create a device group, add a standard device to it and associate two BCV devices to the group.The following commands will create a device group using the default type (regular). Next we will add a device to the device group and assign it a logical name. Then we associate two BCV devices with the device group so we can switch back and forth with the BCV...

EMC has traditionally protected failing drives using Dynamic Spares. A Dynamic Spare will take a copy of the data from a failing drive and act as a temporary mirror of the data until the drive can be replaced. The data will then be copied back to the new drive at which point the Dynamic Spare will return the spare drive pool. Two copy processes are required one to copy data to the Dynamic Spare and one to copy data back to the new drive. The copy process may impact performance and, since the Dynamic Spare takes a mirror position,...

The following Ten Rules provided by Brocade for zoning:Rule 1: Type of Zoning (Hard, Soft, Hardware Enforced, Soft Porting) – If security is apriority, then a Hard Zone-based architecture coupled with Hardware Enforcement isrecommendedRule 2: Use of Aliases – Aliases are optional with zoning. Using aliases should force somestructure when defining your zones. Aliases will also aid future administrators of the zonedfabric. Structure is the word that comes to mind here.Rule 3: Does the site need an extra level of security that...

An LSAN is a Logical Storage Area Network that spans multiple Physical fabrics and allows specified devices from these autonomous fabrics to communicate with each other without merging the physical fabrics. In other word, A logical network that spans multiple physical fabrics. It allows specified devices from the autonomous fabric to communicate with each other using a FC router without merging the physical fabrics.- A LSAN zone is a traditional zone with a special naming convention.- Zone names must start...

PowerPath Migration Enabler is a host-based software product that enables other technologies, such as array-based replication and virtualization, to eliminate -application downtime during data migrations or virtualization implementations. PowerPath Migration Enabler allows EMC Open Replicator for Symmetrix and EMC Invista customers to eliminate downtime during data migrations from EMC storage to Symmetrix, and during virtualized deployments to Invista.. PowerPath Migration Enabler—which leverages the same underlying technology...

Conceptually, even operationally, SRDF is very similar to Timefinder. About the only difference is that SRDF works across Symms; while Timefinder works internally to one Symm.That difference, intersymm vs intrasym, means that SRDF operations can cover quite a bit of ground geographically. With the advent of geographically separated symms, the integrity of the data from one symm to the other becomes a concern. EMC has a number of operational modes in which the SRDF operates. The choice between these operational modes is a balancing...