RE: Informix "hardware bottlenecks"
Hi All, I joined this list a couple of weeks back and have found it interesting with many useful tips. NO RAID 5 ??? Two days ago we just went live with a new NT4 server running IDS7.31. This server has two RAID5 disk arrays for the database and the logs. What issues are we going to run into with RAID5 that lead to exclamations of "NO RAID 5" (Obnoxio)?? So far everything runs fine and very fast. Regards, Bryce Stenberg. Harness Racing New Zealand computer department, emailto:bryce@hrnz.co.nz Phone: +64 3 3385099 -----Original Message----- From: Andris [mailto:andris.shirons@dati.lv] Sent: Thursday, 19 October 2000 21:52 To: Obnoxio The Clown; informix-list@iiug.org Subject: RE: Informix "hardware bottlenecks" Hi, well, I should've expected such reaction...8) Any ideas about other cofigurations, RAID 10 for example? Thanks for answering! Andris > -----Original Message----- > From: Obnoxio The Clown [mailto:obnoxio@hotmail.com] > Sent: Thursday, October 19, 2000 1:44 PM > To: andris.shirons@dati.lv; informix-list@iiug.org > Subject: Re: Informix "hardware bottlenecks" > > > >Recommended RAID level? (RAID 5 or RAID 10 or else)? > > NO RAID 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! NO RAID > 5!!!!!!!!!!!! NO RAID > 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! > NO RAID [and so on....] CAUTION: This email message and accompanying data may contain information that is confidential and subject to legal privilege. If you are not the intended recipient you are notified that any use, dissemination, distribution or copying of this message or data is prohibited. If you have received this email message in error please notify us immediately and erase all copies of the message and attachments. ALSO, unless expressly stated otherwise, the contents of this message represent only the views of the sender as expressed only to the intended recipient, do not commit Harness Racing New Zealand (HRNZ) to any course of action and are not intended to impose any legal obligation upon HRNZ.
One of the issues about RAID5 is that media degradation can occur in "unused" parts of the disk space which is only discovered during another disk failure and rebuild with catastrophic results. If there is a background media scan built into the RAID (as opposed to an offline scan which means you won't run it!) then you can pretty well rule that risk out. Also, a caching front-end (ECC, mirrored and BBU protected) will hide the worst aspects of the write penalty. So, you might well be getting reasonable mileage from your RAID5. However, if you don't have all the protection mechanisms then all will be fine until you hit trouble. Otherwise go with the flow. 0+1 GB "Bryce Stenberg" <bryce@hrnz.co.nz> wrote in message news:8so82u$pfh$1@news.xmission.com... > > Hi All, > > I joined this list a couple of weeks back and have found it interesting with > many useful tips. > > NO RAID 5 ??? > Two days ago we just went live with a new NT4 server running IDS7.31. This > server has two RAID5 disk arrays for the database and the logs. What issues > are we going to run into with RAID5 that lead to exclamations of "NO RAID 5" > (Obnoxio)?? So far everything runs fine and very fast. > > Regards, > Bryce Stenberg. > Harness Racing New Zealand computer department, > emailto:bryce@hrnz.co.nz > Phone: +64 3 3385099 > > > -----Original Message----- > From: Andris [mailto:andris.shirons@dati.lv] > Sent: Thursday, 19 October 2000 21:52 > To: Obnoxio The Clown; informix-list@iiug.org > Subject: RE: Informix "hardware bottlenecks" > > > Hi, > > well, I should've expected such reaction...8) > > Any ideas about other cofigurations, RAID 10 for example? > > Thanks for answering! > > Andris > > > -----Original Message----- > > From: Obnoxio The Clown [mailto:obnoxio@hotmail.com] > > Sent: Thursday, October 19, 2000 1:44 PM > > To: andris.shirons@dati.lv; informix-list@iiug.org > > Subject: Re: Informix "hardware bottlenecks" > > > > > > >Recommended RAID level? (RAID 5 or RAID 10 or else)? > > > > NO RAID 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! NO RAID > > 5!!!!!!!!!!!! NO RAID > > 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! NO RAID 5!!!!!!!!!!!! > > NO RAID > [and so on....] > > > > CAUTION: This email message and accompanying data may contain information > that is confidential and subject to legal privilege. If you are not the > intended recipient you are notified that any use, dissemination, > distribution or copying of this message or data is prohibited. If you have > received this email message in error please notify us immediately and erase > all copies of the message and attachments. > ALSO, unless expressly stated otherwise, the contents of this message > represent only the views of the sender as expressed only to the intended > recipient, do not commit Harness Racing New Zealand (HRNZ) to any course of > action and are not intended to impose any legal obligation upon HRNZ. > >