Hi,
I would like to build a NAS with OMV and 3 or 4 HDD but I have questions about JBOD because I'm not sure to use RAID5. My project is to build 2 NAS identical, one at home and one at a friend's home, and perhaps use RSync to sync both.
So I would like to know about JBOD :
- Is it possible to start with 3 HDD and add 1 or 2 HDD later ? Like a RAID5
- If a drive fail, all data from all disks will be lost or only data on the bad disk ? I have read both on the web
- What are performances of JBOD ? Like a single HDD (about 90/100 MB/s) or less ?
Perhaps I'll have more questions later.
Thanks !
Question about JBOD
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- OMV 1.0
- NicCo
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Don't complicate yourself, if you want to use all the drives use a pooling solution. There is a AUFS plugin, that can join all the 4 filesystem drives into one folder.
If a driver fails you lose data only in that drive only. You can also keep adding drives to the pool. -
Thanks !
So if I understand correctly, the idea is to create one volume by HDD and combine them into one with this plugin ? It doesn't need to use any RAID function ?
Is it better than JBOD ? And is this plugin official or unofficial ? -
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Yes multiple volumes into one. The plugin either uses AUFS or mhddfs, you choose the option in the webUI
It doesn't use any raid/mdadm
I have no idea if is better that a JBOD, I've only used mdadm raid1, now i use raid1 btrfs.
But the pooling plugin is very popular among users here in the forum.The plugin is unofficial, part of omv-extras
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Ok thanks !
I'll try this plugin when I'll install OMV -
Hi
I have a question : what is MFS (it seems to use hard drive balancing to not fill HDD after HDD ?) and UDBA with AUFS plugin ?
Thanks ! -
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Those are terms associated with the old plugin. MFS means most free space. AUFS writes to the drive with the most free space. UDBA has to do with how a user directly accesses the branches. Neither one benefit from changing what the unionfilesystem defaults to.
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So there is no option with the new plugin ? I have not installed OMV at the moment, I'm searching some informations in order to prepare my setup.
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They are enabled by default. Not much else to say.
Greetings
David -
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We found the options to be unneeded. The best research is done by trying it in a VM
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