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RAID write penalty
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RAID write penalty

dnwkdnwk Member
edited October 2014 in Help

What's the software RAID 5 penalty on performance compare to no raid?

Designers: www.linkun.info

Comments

  • rajprakashrajprakash Member
    edited October 2014

    WAT?

    Edit: OP reworded post to make more sense :)

    Signatures are to identify who I am. I'm me. Who the hell are you?

  • I think he is asking about the raid 5 and raid 6 wrote whole problem caused by having parity drives

  • RAID5 has a serious write penalty, you are basically slowed to the write speed of your parity disks or parity array (if you have an advanced RAID setup where parity is set up on an explicitly separate RAID array.)

    I would not recommend it, perhaps RAID50 ; for data you plan to read a lot, but not to write to very often.

    Backupsy uses RAID50 iirc @serverian .

    Acting Director of Albino Geek Services Ltd. My Keybase ID ( gh )
    GoodHosting.co | Enterprise KVM Virtual Private Servers | Twitter / Status : @ GoodHostingCo

  • I have 3 1TB hard drive. I use to run system on 1 hard drive with no raid and data on the raid 1 of other two hard drives. Not sure any better raid configuration could be without adding new hard drive.

    Designers: www.linkun.info

  • @dnwk said:
    I have 3 1TB hard drive. I use to run system on 1 hard drive with no raid and data on the raid 1 of other two hard drives. Not sure any better raid configuration could be without adding new hard drive.

    My personal recommendations:

    • RAID is required if you are hosting customer data. If you are hosting only personal projects, you should still RAID if possible (at least RAID1. You can do this for 3 drives, albeit it's a bit wasteful and a bit of a nutcase to set up and maintain. RAID5 (or 6? Forgot which one) would give you a dedicated parity disk, which you don't want in this case either.)

    • Always make backups of everything you hold dear, those backups should be off the server (such as on your own computer, thumb drive, cloud storage, HubiC, Box, or perhaps all of the above and more. I recommend Backupsy by @serverian for this kind of thing.)

    Sadly, 3 drives leaves you with very little options. 4 Drives gives you RAID10 (the best of RAID in my opinion, as it gives you a fairly consistent write speed; and great read speeds; as well as giving you redundancy enough to allow up to two drives to fail (although you wouldn't want to push it, since if the wrong two fail; you lose everything.)

    Acting Director of Albino Geek Services Ltd. My Keybase ID ( gh )
    GoodHosting.co | Enterprise KVM Virtual Private Servers | Twitter / Status : @ GoodHostingCo

  • drserverdrserver Member, Host Rep
    edited October 2014

    Can i ask what are you hosting on that server ?

    Unmetered servers starting from $12.00 USD p/m. Xeon® E-2134 for $50.00 p/m ||| Xeon® Silver 4110 for $80.00 p/m
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  • GoodHosting said: RAID5 (or 6? Forgot which one) would give you a dedicated parity disk, which you don't want in this case either.)

    That's RAID 4

    Designers: www.linkun.info

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