Re: Is Mirroring w/RAID 5 overkill?

Yes mirroring w/RAID5 would be overkill. In general, for critical systems, I prefer to use RAID-1 (h/w mirroring) as my fault-tolerant solution. It is usually fater then Informix mirroring and allows greater flexibility WRT disk layout. Some of the newer disk sub-systems are fast enough now, however, that table fragmentation is not really necessary for OLTP. Also, EMC2 uses disk caching routines that actually run best if you (intelligently) interleave your data. -d At 02:20 PM 8/19/97 +0000, Steven L Cooper wrote: }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 } }