#Promise pegasus2 r6 18tb raid drivers

A low cost array may have a power supply that would fail more often than a drive but if the power supply fails in the wrong way at the wrong time it could corrupt one of the drives. In RAID 5 you can lose one drive and assuming that you can rebuild the data from the failed drive on a new drive before another drive fails you will not actually lose any data. This may improve the odds that you will have a drive failure, but in a RAID 0 configuration if you do have a drive failure you will lose data. HDD MTBF ratings can vary between 300,000 and 1.2 M. The actual MTBF depends upon the drive type. RAID 0 stripes the data across all the drives and the failure of any one drive will cause significant data loss. Thus we need to compare 3+ HDD RAID 0 vs. Here are some comments:įirst of all to use RAID 5 you need at least three HDDs. Tom, himself, is an engineer with over 30-years experience in media and storage technology. What criteria should we use to choose RAID 0 or RAID 5 - assuming the RAID supports both?ĬOUGHLIN & ASSOCIATES – Tom Coughlin heads a consulting company, Coughlin & Associates, that covers the entire storage industry.Which RAID should media producers use – RAID 0 or RAID 5… and why?.I found the discussion to be fascinating, which is why I’m sharing them with you.īased on Robin’s comments, I asked everyone the following two questions:

#Promise pegasus2 r6 18tb raid drivers

Timothy Standing, a developer that creates device drivers for both RAID 0 and RAID 5 systems.Drobo, a RAID manufacturer that makes RAID 5 devices.G-Technology, a RAID manufacturer that makes both RAID 0 and RAID 5 devices.Promise Technology, a RAID manufacturer that makes both RAID 0 and RAID 5 devices.OWC, a RAID manufacturer that makes both RAID 0 and RAID 5 devices.Tom Coughlin, President of Tom Coughlin & Associates, a consulting firm specializing in storage.

So, I sent his comments to storage experts I knew in the industry and asked them to comment on it:

On the other hand, I didn’t have Robin’s experience. So the extra safety of RAID 5 is more apparent than real, and it’s slower than RAID 0.”Įverything I thought I understood about RAIDs taught me that RAID 5 is better than RAID 0. And when that happens you’ll have to stop work until you get your backup loaded on a new array. “Therefore, in my experience – which includes working in large storage companies, so I have a large sample – a small array is as likely to have a power supply failure as a disk failure. However, low-cost arrays like the ThunderBay only have one power supply and, in my experience, a higher failure rate than any one drive, or even any four drives. This means that if you use RAID 0 you have less than a 1 in 5 chance of a drive failure in any given year with a 4 drive array. Based on the best available research evidence, all hard drives have an MTBF of ≈300,000 hours or an annual failure rate of 3-4%. “On the issue of RAID 0 vs RAID 5 on low-cost arrays: I prefer RAID 0. Recently, after posting a review of a new RAID from OWC, Robin Harris ( wrote a very intriguing comment: Storage is an essential element of media editing – both audio and video – and I enjoy testing and reviewing the latest storage hardware as it comes out. A RAID ( Redundant Array of Independent Disks) collects a group of hard disks into a single enclosure to provide great speed, storage capacity, and/or security than is available with a single hard drive alone.