raid5 hdd adding

how many HDD we can add on raid5 ?
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More about raid5 hdd adding
  1. It depends on your RAID controller. Anywhere from zero (most common) to as many as you have connections for. If you are really talking about adding drives to an existing RAID 5 volume.
  2. Best answer
    While you technically can use RAID 5 with a large number of disks, once you get to a relatively large number, you're actually better off with RAID 6 or RAID 10. What I use when I'm conceptualizing different arrays is the RAID Calculator tool on the website of Synology, a popular NAS vendor. Ignore the part where it lists SHR options, unless you're using a Synology enclosure, as it's specific to their enclosures.
  3. Keep in mind the more disks you add the slower random reads will be. Seq speeds cap on the network after 3 disks in raid5 on a Gb network. It won't be doing you any performance favors. It will save you money on drives by increasing your usable storage %. What size storage are you trying to build out now and over time? Expanding needs to be planned into raid storage from the start.
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