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  • #21
    Originally posted by mbello View Post
    Brane215 I am sorry but RAID5 with 10TB drives is useless. Search for "raid 5 is dead" to know why.
    No need. Been there, read that. That article is crap.

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    • #22
      Originally posted by Brane215 View Post

      No need. Been there, read that. That article is crap.
      I did not mean any specific article. There is plenty of discussion on the net about this. In RAID 5, once you lose a disk it is as if you were running RAID-0 with your disks. To restore an array of 10TB disks it will take enough time to be scared about.

      Unless you have a backup array in sync, RAID5 as you suggest is not very safe.

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      • #23
        Sure, sure. From that perspective, no array is very safe. And since you need the backup ( at least of essential stuff) anyway, what's the big deal ?

        I've been running 10-disc RAID5 and RAID6 arrays for some time and I could always "smell" incoming troubles before the disk actually failed. And even on failed disks, I could recover most of the data.

        Also, I plan to use RAID5 in that scheme as an everyday cache of much bigger archive array. So, even if one of the disks fail, backup availability is guaranteed, except maybe for latest data.

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        • #24
          Originally posted by mbello View Post

          I did not mean any specific article. There is plenty of discussion on the net about this. In RAID 5, once you lose a disk it is as if you were running RAID-0 with your disks. To restore an array of 10TB disks it will take enough time to be scared about.

          Unless you have a backup array in sync, RAID5 as you suggest is not very safe.
          RAID cannot ever replace backups. Imagine accidents such as fire burning the whole house down. You'll need off-site backups. With a sufficiently sophisticated filesystem, filling a 10 TB disk takes a bit over a day. 2 TB will be ready in 6 hours, 3 TB 9 hours. Assuming the raid arrays are 100% full. I'm willing to bet on that. My home RAID has 3 TB disks and around 40% free, few unused spares are sitting in the empty hotplug drive bays, powered off with hdparm. I get an SMS if a disk fails. I find it highly unlikely that two disks will crash in ~5 hours + hour or two when typing the magic commands for replacing disks via ssh.

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