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Forum Discussion
Flex-Raid 0 or JBOD
I've recently bought a ReadyNas Duo v2 mainly for media streaming, and have been testing it out with a couple of 2TB I had. It have no problems streaming video etc.. However I did find it slow when copying files to the unit (write speed about 5MB/s - 7MB/s occasionally creeping up to 10MB/s) taking many many hours to transfer a TB of data. Part of my problem is proberbly my network switch which is a 10/100 and possible the older drives I am using. So hoping to speed things up I have ordered 2 x 3TB drives (from the recommended list), a Netgear 8 port Gigabit switch and Cat 6 cables.
My question is that I am not too sure what is the best Raid setup for the drives Flex-Raid Raid 0 or JBOD. I understand that Raid 0 is stripped across the 2 drives and JBOD they are kept a seperate drives but is their much speed difference when writing data to the drives. I like the idea of having 2 seperate drives because if one fails I can continue using the other till I can replace it.
My question is that I am not too sure what is the best Raid setup for the drives Flex-Raid Raid 0 or JBOD. I understand that Raid 0 is stripped across the 2 drives and JBOD they are kept a seperate drives but is their much speed difference when writing data to the drives. I like the idea of having 2 seperate drives because if one fails I can continue using the other till I can replace it.
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- In either case (jbod or raid-0) you'd need to recover your data from backup if a drive fails - the only difference is how much data you need to recover.
Using RAID-0 that spans both drives (with a single volume) means that you will lose all your data if either drive fails. JBOD of course only loses the data on the failed drive.
Having multiple drives in the array generally does speed things up, but the main limit you are seeing is due to the 100 mbit network speed. A single drive can easily keep pace with streaming, and your file copies should be much faster once you deploy the new network.
Personally I would go for reliability over raw speed. My media library is on a RAID-5 (xraid2) volume, and is also fully backed up. While it isn't as critical as some of my other data, it is hard to get back (re-ripping, tagging, etc is a lot of work), and there is a lot of it. I figure that if something is worth saving, it is worth backing up - so I don't spend a lot of energy sorting "critical" files from "not critical" files. - Thanks for the reply.
I think perhaps I will have to use JBOD because I wouldn't have to restore all my data if a drive goes down, only the faulty one, which obviously would be quicker than having to restore two.
I have about 4TB of media data which is already backed up twice to external USB drives so I don't really need redundancy. - Sounds like a reasonable approach.
- I've installed the 2 new drives ordered plus the Gigabit switch and cables and speed has increased to about 30 MB/s. So, a reasonable bit of improvement although I would haved like to seen a little more.
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