> > *. . .the only purpose of a RAID backup is to prevent a single point of > failure (like a disk failure) resulting in lost backups.*
You do not need a RAID array to prevent a single point of failure. You take those 3+ disks, put them in 3 different machines. Or even in the same machine as single drives. Same difference, only less wear and tear on the drives, more cost effective, and perhaps a small amount slower as singles. In the field you'll likely not run into any RAID 5/6 arrays. At least for corporate storage. You're more likely to see RAID10, or RAID0 + 1. Because there is nothing faster than striping disks, and RAID1 does not have an impact on performance if set up correctly. RAID5/6 is just a way for the home user to feel all warm and fuzzy . . and literally feed the companies who offer the hardware for such arrays. Be it controllers, or "special" hard drives . . . special software, chipsets with BS built in RAID( software ). I still use Seagate drives(nothing but), and have no issues. Why ? Probably because I do not run RAID. RAID is notorious for being hard on drives. Especially RAID 5/6. I will admit, that Seagate's reputation has gone into the toilette in the last 8 or so years. All their drives used to be lifetime warranty. Now days I think they give 3 years . . . not even as good as WD, or even Samsung SSDs . . . Anyway, seriously. Unless you're running a server that sees thousands+ of transactions a day. You don't need RAID. But hey, don't pay attention to me. . . On Sun, Nov 29, 2015 at 1:44 PM, John Syne <[email protected]> wrote: > That makes perfect sense. BTW, the only purpose of a RAID backup is to > prevent a single point of failure (like a disk failure) resulting in lost > backups. > > One thing to pay attention to is the MTBF numbers for disks. I was a firm > believer in Seagate Barracuda disk until I had a whole number of them fail > over a few months. Speaking Seagate tech support, they explained that the > SMART data on these disks showed they had more than the 3,000 hours MTBF > and hence I should have expected them to fail. I couldn’t believe what they > told me; running their disks 24 hours/day, they expected failures in 1/3 of > a year. They were right, look at the SMART data on Seagate disks and you > will see read write errors in the 10’s of thousands or more. > > After that I use Western Digital RED disks which are designed for 24/7 NAS > applications. Looking at the disk SMART data, I see 0 read/write errors. > > Regards, > John > > > > > > On Nov 29, 2015, at 3:37 AM, [email protected] wrote: > > > > John Syne <[email protected]> wrote: > >> [-- text/plain, encoding quoted-printable, charset: UTF-8, 156 lines --] > >> > >> Yeah, but rsync only gives you a snapshot and not a history of your > backup. > >> When I really mess up, I want to go back to the state of my machine 15 > >> minutes ago, or two days ago. This has saved me a lot of head > scratching, > >> trying to find out where I messed up. I really like the way timemachine > > > > I use an rsync based incremental backup system (I wrote it myself > > having used rsnapshot for a while, rsnapshot is OK but I think it's > > too complex). > > > > I do hourly incremental backups locally to another disk on my main > > machine and I do daily incremental backups to a remote machine. The > > daily remote backups get thinned out as they get older so there are > > daily backups for the last month, then monthly ones for 12 months, > > then yearly ones. > > > > -- > > Chris Green > > · > > > > -- > > For more options, visit http://beagleboard.org/discuss > > --- > > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected]. > > For more options, visit https://groups.google.com/d/optout. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
