hi, don't forget on filespace collocation and "other stuff" which means you can backup each fs/fsp to different tape at the same time (i even think it works that way by default)
thoughts? On Wed, Jan 7, 2009 at 3:26 PM, Oscar Kolsteren <oscar.kolste...@ingdirect.co.uk> wrote: > Hi Richard, > > We backup our Oracle database via two channels so the data is split onto > two different tapes. Therefore we can use two channel restores. > > Four channel restore doesn't make any sense as the other two extra > channels can't mount the tapes which are already in use by the first two > restore sessions. > > Hope this helps > > Best Regards, > Oscar > > > UNIX/TSM/SAN Administrator | ING Direct > 410 Thames Valley Park Drive, Reading, Berkshire, RG6 1RH > Tel: 0118 938 1990 l Email: oscar.kolste...@ingdirect.co.uk > > > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:ads...@vm.marist.edu] On Behalf Of > Richard Rhodes > Sent: 07 January 2009 14:16 > To: ADSM-L@VM.MARIST.EDU > Subject: [ADSM-L] TDP for Oracle - multi channel restore > > Hello, > > We are still fairly new to RMAN/TDPO backups, and trying to understand > behavior. > > We have one 10tb database that performs RMAN backups to TSM using one > tape drive (one channel). Oracle datafiles are interleaved (not sure of > the level). > > We are now performing a full restore on this database. The dba > allocated > 4 channels for the restore (4 tape drives). We started getting session > timeouts. It looks like Oracle was asking for aggregate files on > different > channels that in TSM are on the same tape. This caused tape contention > and session timeouts. The restore was stopped and changed to a > single channel. > > I've been trying to find info on issues/limitations around RMAN/TDPO > restores > with multiple channels, but not finding much info. > > Questions: > > 1) Does the number of channels on a restore have to be the same or less > than the number used for the backup? > > 2) Is it even possible to do multi channel restores? In other words, > does > RMAN have knowledge of the tape volumes so as to not cause > tape contention across channels? > > > ----------------------------------------- > The information contained in this message is intended only for the > personal and confidential use of the recipient(s) named above. If > the reader of this message is not the intended recipient or an > agent responsible for delivering it to the intended recipient, you > are hereby notified that you have received this document in error > and that any review, dissemination, distribution, or copying of > this message is strictly prohibited. If you have received this > communication in error, please notify us immediately, and delete > the original message. > > ************************************************************************ > ******************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom > they are addressed. If you have received this email in error please > notify the system manager. > > This footnote also confirms that this email message has been swept > by an antivirus scanner for the presence of computer viruses. > > ING Direct NV is a limited liability company incorporated in The > Netherlands. Registered in England & Wales, Branch Ref BR7357, 410 > Thames Valley Park Drive, Reading, Berkshire, RG6 1RH. > ************************************************************************ > ******************************************** > > --------------------------------------------------------------------------------------------------------------- > ATTENTION: > The information in this electronic mail message is private and confidential, > and only intended for the addressee. Should you receive this message by > mistake, you are hereby notified that any disclosure, reproduction, > distribution or use of this message is strictly prohibited. Please inform the > sender by > reply transmission and delete the message without copying or opening it. > > Messages and attachments are scanned for all viruses known. If this message > contains password-protected or encrypted attachments, the files have NOT been > scanned for viruses by the ING mail domain. Always scan attachments before > opening them. > > ING Direct NV is limited liability company incorporated in The Netherlands. > Registered in England & Wales, Branch Ref BR7357, 410 Thames Valley Park > Drive, Reading, Berkshire, RG6 1RH. > --------------------------------------------------------------------------------------------------------------- > -- Timothy Leary - "Women who seek to be equal with men lack ambition."
