Timefinder/Mirror is the software that is required to control the Business Continuance Volumes that are defined in the BIN file of the Symmetrix.
This has been discussed at a high level in previous posts, however, it is probably worth stating here that all RAID configuration specifications for the pair of volumes (Standard and BCV) is controlled within the Symmetrix device itself. However, a change to the condition of the pair (i.e. mirror Established or mirror Split using EMC terminology) is controlled by TF/Mirror from the host through commands to the Symmetrix. Inside the Symmetrix, there is a requirement for enough storage to be allocated to support a complete copy of both volumes. Both volumes must be defined as the same size. From my point of view, the most valuable feature of this arrangement is the ability within the Symmetrix to perform what EMC calls a "Consistent" split of the mirror across any number of volumes. The Split of the mirror between all volumes is I/O consistent at a single instant in time. This is especially good for database subsystems that have related data across a large number of volumes. The user can break off a copy of a subsystem assuming that all related datasets are contained upon a select set of identifiable volumes that exist in this mirrored relationship -- Standard to BCV. The resulting volumes that contain the subsystem appear as though the subsystem was simply brought down by something as simple as a power failure and the subsystem is perfectly capable of dealing with restart after a power failure. Tom Moulder -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of R.S. Sent: Saturday, January 06, 2007 8:46 PM To: [email protected] Subject: Re: V2X2 vs. Shark (SnapShot v. FlashCopy) Bruce Black wrote: >> Just to complement: there's also TIMEFINDER/MIRROR. > True, also known as BCVs (Business Continuance Volumes). This was EMC's > > original point-in-time backup function. EMC does market it as the > :"high-performance" option. Again, just to correct: BCV is not TF/MIRROR, however it's related. The MIRROR is done from STD (standard) device to BCV device. Type of devices is defined by EMC and is recorded in BIN file. There are also other types of devices, it. SAVE device (for SNAPshots). Regards -- Radoslaw Skorupka Lodz, Poland ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.410 / Virus Database: 268.16.6/617 - Release Date: 1/5/2007 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
