"Hal Merritt" <[email protected]> wrote in message news:<1910aea19cd2554fb59403184ebe4381026c8d0...@mmoexchmbs01.jhacorp.co m>... > Following up on a previous thread - > > We are currently 'tapeless' in that our primary DR strategy is near real time dasd mirroring via XRC. Tape is used for local PIT backup/restore and for secondary PIT offsite sotrage. > > We are looking at a VTS to expand that capacity. However, someone here mentioned a VTS (IBM 7720) that does not use physical tape on the back end and can be networked to like uints. > > Usually, management priority is cost effectiveness, but we have floor space and power challanges at our warm DR site. > > Question: would a network of two or three of those disk based units satisfy my off site storage mission with less floor space and power? Could I, for example, have one primary unit mirror to two diverse secondary units? > > The very best of the season to you, yours, and theirs. > >
Hal, the TS7720 is the diskonly version of the TS7740. Both can be setup in a grid configuration (3-way now and 4-way from the 1.5 code that will be released next month). Both will satisfy your off site requirements. The replication can be synchronous or asynchronous, where synchronous means that the tapedata will be replicated at CLOSE time, not earlier. The difference is in the details: the TS7720 is disk-only, so has no backend physical tapes and therefor superfast mounttimes for all virtual tapes, but the configuration is limited. The TS7740 has backend physical tapes, so has much more capacity, but longer mount times for virtual tapes, that must be recalled from the physical tapes into the cache. The physical tapes are in the box and you don't need to care about them. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
