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mdadm vs. FlexRAID - Page 2

post #11 of 28
Just curious what you ever decided, OP.

I've been looking at exactly the same thing, and was thinking that FlexRaid looked like a viable option for me. But I seem to be running into brick walls in trying to find more info on FlexRaid. It seems all the info I find points back to Openegg.org which seems to be dead
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post #12 of 28
Thread Starter 
@Lummer,

OpenEgg.org has been down for about a week or more now. It really angers me... it's like they just disappeared. Has me wondering if Brahim is as dedicated to his cause.

Because of the situation, I threw ZFS back into the mix... and am leaning hard towards it right now. I experimented with mdadm on Ubuntu and Fedora in a VM, as well as ZFS (ZFSGuru and OpenIndiana+napp-it WebGUI) in a VM. I've learned a handful of commandline as well as gotten comfortable with the napp-it web interface.

I contacted treadstone on HardForum to ask him questions about his 100TB FlexRAID build. If you want I can share the info he shared with me via PM.

But as it stands on this day, I've purchased a SAS2008 chipset HBA and am prepared to go the OpenIndiana/ZFS road, whether it be standalone or ESXi based.
 
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post #13 of 28
Yeah if you would share that by PM that would be great.
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post #14 of 28
Thanks for the PM Bonz.

By the way, the Openegg Forum seems to be back up today
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post #15 of 28
Thread Starter 
Quote:
Originally Posted by Lummer;13340855 
Thanks for the PM Bonz.

By the way, the Openegg Forum seems to be back up today

No problem. Yea, saw that. Thanks.
 
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post #16 of 28
could you send me the info also?

thanks.
post #17 of 28
Thread Starter 
Quote:
Originally Posted by the_beast;13352861 
could you send me the info also?

thanks.

PM'd.

Back on topic, kinda. I've decided to give ZFS a shot. I went and bought 10x2TB Hitachi 5k3000's. With OpenEgg being down for > 1 week, during the time I was researching my options, I got pissed and started trying mdadm and ZFS.
 
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post #18 of 28
Quote:
Originally Posted by Bonz™;13353563 
PM'd.

Back on topic, kinda. I've decided to give ZFS a shot. I went and bought 10x2TB Hitachi 5k3000's. With OpenEgg being down for > 1 week, during the time I was researching my options, I got pissed and started trying mdadm and ZFS.

There are Pros and Cons to every filesystem, and it's good to know them beforehand before jumping into something.

One AMAZING Pro of ZFS is that it automatically corrects bit rot. No other FS to date does that.

A Con, not that bad of one though, is that you cannot increase the size of a vdev. So, in order to increase your zpool, you need to create a new vdev, this coud cause some overhead.

Why?

Say you create a vdev with 3 1TB drives for RAID5. You want to increase it by another three or so. You cannot do that. You would have to create a new vdev, and most likely it would be RAID5, so you have an extra parity drive overhead. Your zpool will increase, but unfortunetely, your vdevs cannot, unless you delete them and recreate them, which would, of course, remove your data.

Remember to take these limitations in mind when considering future upgradeability.
post #19 of 28
Thread Starter 
Quote:
Originally Posted by cubanresourceful;13372248 
Say you create a vdev with 3 1TB drives for RAID5. You want to increase it by another three or so. You cannot do that. You would have to create a new vdev, and most likely it would be RAID5, so you have an extra parity drive overhead. Your zpool will increase, but unfortunetely, your vdevs cannot, unless you delete them and recreate them, which would, of course, remove your data.

Remember to take these limitations in mind when considering future upgradeability.

Thanks for the info cuban. I've taken this into consideration and purchased 10 2TB drives for a raidz2. This will be media storage for now. I will have a 2nd pool of 5 1TB's in raidz for the rest of my data that is not media.

When the time comes, I will buy another pile of drives and take it from there.
 
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post #20 of 28
Quote:
Originally Posted by Bonz™;13373782 
Thanks for the info cuban. I've taken this into consideration and purchased 10 2TB drives for a raidz2. This will be media storage for now. I will have a 2nd pool of 5 1TB's in raidz for the rest of my data that is not media.

When the time comes, I will buy another pile of drives and take it from there.

You can also, if I remember correctly, replace one hard drive with a larger one in the vdev to increase storage. Though, due to RAID, your storage will be based off of the smallest and slowest drive (maybe RAID 5/6 is different?).

So, to increase a RAID 5/6 vdev, just upgrade your parity drive first, wait for it to rebuild, then upgrade each drive, again waiting for the array to rebuild.

I am pretty sure that works, but again, I could be wrong. I can test in a VM if you would like, Solaris is very interesting to play with, and ZFS is a pretty cool FS. biggrin.gif

Also, be careful when buying a large amount of hard drives that are from the same manufacturer, brand, and size. That could [potentially] increase the chance of multi drive failure.

Anyways, good luck with your build! biggrin.gif
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