"R.S." <r.skoru...@bremultibank.com.pl> wrote in message news:<4b21fae4.1020...@bremultibank.com.pl>... > Tommy Tsui pisze: > > Hi all, > > > > Any shop using this two types of tape system. Any comment one them. I > > have a question on whether the SUN VSM 5 can support synchronous > > replication? IBM VTS 7740 support immediately mode. > > Yes, VSM does support sychronous replication (although there was some > ugly gotcha in v6.1 software AFAIR). > BTW: I doubt that any shop is using two kinds of tape systems, with the > exceptions for change tape system, datacenter merge, etc. > > > -- > Radoslaw Skorupka > Lodz, Poland
Beware: both support synchronous replication, but synchronous replication is not the same as PPRC for Dasd is. The tape is replicated at CLOSE time. The Unload/Rewind command ends when the replication is succesful, so when the application closed the tape successfully it can be sure the data is replicated. However, when disaster strikes while the tape is being written, no data has been replicated to the other side, so applications cannot use the logfiles on those tapes in the other location for recovery. 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
