Re: Is Mirroring w/RAID 5 overkill?
On 19 Aug 1997 17:18:07 -0400, James_T_Ford@fleet.com (James T Ford) wrote: > Steve, > If you have the disk for mirroring why are you using raid??? > With mirroring you will take advantage of the parallel read function > of informix With RAID5 you take advantage of the controllers cache and the ability to do parallel reads as well (it reads from the primary and mirrored drive > simultaneously) you will also not suffer the performance impact of > using raid. Using intelligent controllers there is no appreciable performance impact associated w/ RAID 5 > You don't say a whole lot about your disk configuration so its hard to > advise about mirroring strategies. > > Believe me you will know if one of your raid drives goes down (your > users will start screaming things are slow...) > > jim > > > > > >______________________________ Reply Separator _________________________________ >Subject: Is Mirroring w/RAID 5 overkill? >Author: "Steven L Cooper" <scooper@thecompounders.com> at Internet >Date: 8/19/97 2:20 PM > > >Howdy, >Just wondering what ya'll think? > >I have a DG AV/3600 with 24GB of RAID 5 (across 6 drives) running SCO >OpenServer 5.0.04 and OWS 7.2.xx. So far, Informix has run happily with >and without mirroring. (I learned the evils of filling the rootdb, but >that is another story...) > >Does Informix do anything "special" with a mirror that my RAID 5 controller >is not already doing? If the RAID controller goes down, a mirror is not >going to do me any good anyway! But, if one or two of the hard drives go >down, Informix would not even "know" about it. From what I have read, >Informix will failover to the mirrored location if a problem is detected in >the main location, but is that problem normally hardware related? > >Thanks for any comments, >Steve >-- >Ignorance can be cured! >scooper@thecompounders.com > Mike South Producer/Director "Mike South's Southern Belles" "Mike South's Travels" Winner 1997 AVN Best Amateur Video Winner 1996 Rocky Mountain Oyster Readers Poll Best Pro-Am Series