Great articles. I have been sceptical of Raid5 for main years after an incident where I spent 2 weeks waiting on a spare controller being sourced while an array was down and 400+ people were asking me when it would be fixed about twice a day!! In the SBS case it was a Raid1 Pair. I now would much rather put in 4 mirrored pairs than a RAID5. Putting in faster drives or SSD is a much simpler option. Anyone can install a RAID5 set, but it takes a lot of work to recover data from one. It's like anything in IT, if you put all your eggs in one basket then you need to protect that basket. If your budget cannot afford to protect that basket then you need to mitigate or accept the risk. Mike
-----Original Message----- From: Angus Scott-Fleming [mailto:[email protected]] Sent: 08 October 2011 05:14 To: NT System Admin Issues Subject: Re: Server gets sloooower the longer it stays up On 5 Oct 2011 at 11:44, Mike Hoffman wrote: > I´ve just had a similar thing with an SBS 2008 box, and discovered the > Raid drives had issues. After replacing one drive the rebuild stuck at > 99.83% and after that every 6-8 hours the network cards stopped and the > system just froze. Now the box is virtual and running fine since. Related story .... Why RAID 5 stops working in 2009 | ZDNet http://www.zdnet.com/blog/storage/why-raid-5-stops-working-in-2009/162 Due to the size of modern drives, one can apparently EXPECT a read-failure during a RAID-5 rebuild, so RAID 5 is no longer reliable enough. With 120GB drives it was fine. With terabyte drives it isn't. RAID5 versus RAID10 (or even RAID3 or RAID4) "To put things into perspective: If a drive costs $1000US (and most are far less expensive than that) then switching from a 4 pair RAID10 array to a 5 drive RAID5 array will save 3 drives or $3000US. What is the cost of overtime, wear and tear on the technicians, DBAs, managers, and customers of even a recovery scare? What is the cost of reduced performance and possibly reduced customer satisfaction? Finally what is the cost of lost business if data is unrecoverable? I maintain that the drives are FAR cheaper! Hence my mantra: NO RAID5! NO RAID5! NO RAID5! NO RAID5! NO RAID5! NO RAID5! NO RAID5!" http://miracleas.com/BAARF/RAID5_versus_RAID10.txt -- Angus Scott-Fleming GeoApps, Tucson, Arizona 1-520-290-5038 Security Blog: http://geoapps.com/ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
