Re: Mirroring: hard or soft ?
I had the opportunity to compare the performances between Informix SE 5 running on SCO 5.0.2 (Ppro-200, 64 Mb; 1 HD U/W SCSI-2 9Gb) and HP Netserver with SCO 5.0.5, IDS 7.30 (bi-Xeon 400Mhz, 512 Mb, 2 HD U/W SCSI-? 9Gb each and HD controller with 16 Mb cache). The 2 drives are mirrored (RAID 1). I run the same app (payroll) and found this poor old Ppro is just 38% slower than the brand new HP. Even more deceiving me is the fact that other users were logged on whi command use tNews NNRP server INN 1.7.2 08-Dec-1997 ready (posting ok). [24;72H97[m[8;80H[19;32H4[m[24;72H89[m[8;80H > >The database is about 1.5Gb in SE. > > > >I wonder if the best way is to mirror one disk over the second or to let > >IOWS manage his own mirroring at a software level (using raw devices of > >course). > > > Hardware mirroring usually works out better. > > >Perhaps will it be useful to mirror ROOTDBS and LOGDBS for security > >reasons but not the data DBS ? I'm not sure it will make a big > >difference in terms of performance but what about security in case of a > >crash ??? > > > Mirroring everything in case of a crash... > > >Please help ... > > > > -- > David Williams