Re: [qmailtoaster] Re: Qmailtoaster iso upgrade issue

[Maxwell Smart]

I never did alot with RAIDs, but all were hardware and not one ever worked as advertised for recovery.  I prefer a solid mirrored backup.  To each his own. On 05/16/2012 07:59 AM, Dan McAllister wrote: IMHO, data protection is a MUST, and thus RAID is a MUST for QMAIL (and other client services like web servers and the like). The question isn't about RAID/NO-RAID, it is about WHICH RAID and HOW: To my mind, RAID decisions come in TWO flavors:   - RAID TECHNOLOGY (e.g.: RAID-1 vs RAID-5 vs. RAID-10 -- the 3 most common types of RAID today), and   - RAID IMPLEMENTATION (e.g.: Motherboard RAID [aka: Fake-RAID], Hardware RAID, and Software [Linux md] RAID) MY OPINIONS are: From a RAID IMPLEMENTATION perspective, I have found the following to be true:  - Motherboard-based (firmware-based) RAID (any flavor) = UNSTABLE in most Linux environments -- AVOID  - Hardware RAID = BEST performance, BEST reliability, more expensive  - Software (Linux-based) RAID = GOOD performance, GOOD reliability, LOWEST EXPENSE (a common choice -- I know others favor the Linux RAID, and I'll admit that I'm still a hardware RAID snob! -- but these are MY opinions! When it comes to RAID TECHNOLOGY, for me the choice is rather clear:  - RAID 10 = BEST STABILITY, BEST PERFORMANCE, HIGH EXPENSE - IMHO not usually worth the cost/complexity unless you need a HUGE or FAST volume  - RAID 1 = BEST STABILITY, GOOD PERFORMANCE, MODERATE EXPENSE - IMHO overall best HW RAID bang-for-the-buck (and my usual choice)  - RAID 5 = GOOD STABILITY, IFFY PERFORMANCE, LOWEST EXPENSE - undegraded performance same as RAID 1, DEGRADED performance is POOR So you'll see that I agree with David and Eric on some of these points... and I know we differ on others... that's what opinions are all about! Dan McAllister IT4SOHO On 5/16/2012 7:58 AM, David Milholen wrote: As a standard and when possible I like to do raid1 just for failover or easy recovery. I was my first time I wanted to try the onboard HW raid controller and all the trouble I have ran into I gave up on it and found a true HW raid controller. I am going to try it this morning. If it fails I will do the traditional SW raid. On 5/16/2012 12:02 AM, Eric Shubert wrote: FWIW, stay away from raid-5 if at all possible. Raid-1 is best, raid-10 ok. -- David Milholen Project Engineer P:501-318-1300 -- IT4SOHO, LLC PO Box 507 St. Petersburg, FL 33731-0507 CALL TOLL FREE: 877-IT4SOHO We have support plans for QMail! --