Hi, I am looking at building my own NAS and using OMV. If I want to use RAID, should I buy a RAID card, or is it good enough to have the HDDs plugged into the non-RAID motherboard?
Do I need a RAID card?
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- OMV 3.x
- BBmine
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Depends on why you want raid. Many people are successful at running software (mdadm) raid with the drives connected to the motherboard. Others use raid because they think it is backup which it is not.
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There are many comments all over the place about why one is better than the others. I have used both and don't see a major difference. If you have enough ports for the drives you want to use I would lean towards mdadm. ZFS has some interesting features too. If you might want that in the future be sure the raid card will act as an hba card too.
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OMV supports software RAID. If you really need RAID (you probably don't), then that is all you need.
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Depends on why you want raid. Many people are successful at running software (mdadm) raid with the drives connected to the motherboard. Others use raid because they think it is backup which it is not.
Doesn't that depend on the kind of RAID you are using though? I believe it's RAID 1 that it's the one where the data is mirrored on two drives.
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OMV supports software RAID. If you really need RAID (you probably don't), then that is all you need.
I was going to use RAID 0 (Maybe RAID 10 at some point in the future).
I know RAID isn't a backup.
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Why RAID 0 on a NAS?
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Doesn't that depend on the kind of RAID you are using though? I believe it's RAID 1 that it's the one where the data is mirrored on two drives.
Definitely not. Raid gives you redundancy so you can keep using the server if a drive fails. With RAID 1, if you delete a file accidentally, do you have a backup?
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Why RAID 0 on a NAS?
Some people may not know about mergerfs (unionfilesystem plugin) and use it to pool their drives.
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I was going to use RAID 0
But do you know, if one drive fails you lose all your data of both drives? With RAID 0 you can enhance the performance but double the risk of data lost.
You should think about @ryecoaaron´s advice instead. -
Using RAID 0 on a NAS is pointless. The bottleneck will always be the network, not the drives.
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Using RAID 0 on a NAS is pointless. The bottleneck will always be the network, not the drives.
Actually, my current network speed is 100 megabits/s, and I was going to upgrade it to 1 gigabit/s soon. From my own testing on a local machine with a 7200 rpm HDD (granted, the HDD is 80% full, so it might be slowed down because of that), I was only able to get speeds of up to 320 megabits/s. That's about 1/3 the speed I could get with the upgraded network.
However, after some thinking, I've decided that maybe I won't do RAID 0, but a higher RAID. Just not sure which one yet.
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