In 7.4 the read access on the log is only important for backup or during redo. So the write performance is interesting. Mirroring realized by hardware should be faster and mirroring by the os/filesystem might be faster.
kind regards uwe > -----Original Message----- > From: Flemming Frandsen [mailto:[EMAIL PROTECTED] > Sent: Montag, 31. M�rz 2003 18:13 > To: SAPDB > Subject: Logging to a mirror vs. LOG_MODE DUAL > > > I'm setting up a new system here and I want to get the best possible > performance, the platform is Linux 2.4.18 (SuSE 8.1) and I > have two fast > disks for putting the log on, but how? > > Option 1: Create a mirror of the two devices and use the > mirror in raw > mode as a single log device (LOG_MODE SINGLE) > > Option 2: Create two raw devices and let SAP DB use them in > LOG_MODE DUAL. > > Is SAP DB smart about what data it reads from the two disks > or will I be > better of letting the OS handle the mirroring? > > -- > Regards Flemming Frandsen - http://dion.swamp.dk > PartyTicket.Net co founder & Yet Another Perl Hacker > > _______________________________________________ > sapdb.general mailing list > [EMAIL PROTECTED] > http://listserv.sap.com/mailman/listinfo/sapdb.general > _______________________________________________ sapdb.general mailing list [EMAIL PROTECTED] http://listserv.sap.com/mailman/listinfo/sapdb.general
