Parity checking is also used in communication betweenmodems. Here, parity checking can be selected to be even -- a successful transmission forms an even number -- or odd. Users may also select no parity, meaning
A system for implementing RAID-5 parity generation and reconstruction. Data for an array of disk drives is placed in an I/O buffer. The RAID-5 parity engine creates parity data and stores the resultin
Parity Update Footprints (PUFPs) are kept on the disk drives themselves (rather than in nonvolatile RAM) so that the PUFPs will move along with the RAID arrays and data they protect
Raising tickets has been mostly useless for us, out of about 20 tickets we've raised with Pro support, only two were resolved. None of them have I ever paid, meaning they're all accepted as bugs. But they never have been resolved.Oh, how I long to the days of VMS / VAX which h...
13. The system of claim 11 wherein computation of row parity blocks is replaced by a redundant encoding of data blocks in a stripe that is tolerant of single device failures. 14. The system of claim 11 wherein the device storage layer is a RAID layer and wherein the storage devices are...
For example, in a RAID 5 system comprising 5 disk drives, the parity information for the first stripe of blocks may be written to the fifth drive; the parity information for the second stripe of blocks may be written to the fourth drive; the parity information for the third stripe of ...
The Symmetrix architecture operates under a “cache all” policy, meaning that all transfers, i.e. from the host to the drives or from the drives to the host, go through cache. The principal function of the Directors is the movement of data between the host and Global Memory (cache) or...
(designated as even parity) and -1 (odd parity). More precisely, parity is defined as the eigenvalue of the operation of space inversion. Parity is a concept that has meaning only for fields or waves and therefore has meaning only in classical field theory or in quantum mechanics.See...
In a RAID system that includes more than one array of disks, each array is often identified by a unique drive letter, and in order to access a given file, a user must correctly identify the drive letter for the disk array on which the file resides. Any transfer of files from one disk...