Re: Defining chunks and extents using RAIS 5
On my site we use Solaris 2.6 (Disk Suite) with raw devices on RAID 5 and it works O.K. As far as I know (I'm new to Unix), it is defined just like any other raw device (if you want, I can privatly send you a description of my configuration). bye... David Tamburin wrote: > On this line of thinking... > Does anyone know if you set up RAID 5 with Disk Suite for solaris if the > raid 5 metadevices > created are usable by informix? (In disksuites docs it says, that to use > them a application would have to have its own way of accessing the raw > device). And if they are do you set them up like you where setting up a > normal raw device for informix? (At this time I am using raid 1.) Better > than nothing. :) > > Thanks > david.tamburin@protegrity.com > > > -----Original Message----- > > From: owner-informix-list@iiug.org > > [mailto:owner-informix-list@iiug.org]On Behalf Of Art S. Kagel > > Sent: Wednesday, February 10, 1999 1:01 PM > > To: informix-list@iiug.org > > Subject: Re: Defining chunks and extents using RAIS 5 > > > > > > Ricardo Palmeira Ten'rio wrote: > > > > > > Is there any performance gains separating rootdbs, logdbs, physdbs and > > > datadbs when we use RAID 5? > > > For the same reason should I define the apropriate first and next > > > extents for tables? > > > > Yes, definitely performance gains and TREMENDOUS safety gains, you will > > sleep better knowing you cannot loose you data and logs in one fell > > swoop. Setting extent sizes to reduce fragmentation, as well as using > > multiple data dbspaces to isolate busy tables from each other to > > further enhance performance and reduce fragmentation, can have definite > > positive value. > > > > Please look up my periodic rants (I'm just too tired to rehash this in > > full right now) about NOT using RAID 5 for database chunks in the IIUG > > archives of this newsgroup or read the relevant sections of my recent > > TechNotes article on tuning. I STRONGLY dislike RAID 5 for database > > chunks and with the price of drives today completely reject ANY cost > > based objection to using Informix mirror, RAID1 or RAID10 instead. > > FWIW. > > > > Art S. Kagel > > -- Arturo Rodr'guez Mutis Director de Inform'tica Melexa Ltda. PBX (571) 360 3055 FAX (571) 360 2562 e-mail melexa@colomsat.net.co