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post #11 of 19
Quote:
Originally Posted by Plan9 View Post

The opening post does though - hence my comment rolleyes.gif
yup. that would work fine
Personally I'd get 3x 1TB drives now and raidz them as with only 2x 1TB the most you can have is 1TB of mirrored storage. With 3x 1TB raidz, you can have ~1.9TB of storage plus still have 1 disk redundancy (ie 1 disk can die and you wont lose your data).
Sadly you cannot convert a mirror into a raidz, so you basically have to decide now else have a painful upgrade cycle (or just keep buying 2x drives and keep adding mirrors to your pool - which could be an option as well. but that will work out more expensive in the long run)

yeah RAID 5 would be the way to go for a samll array, the risk of a dual disk faliure increases as the number of disks increases thumb.gif
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post #12 of 19
Quote:
Originally Posted by stubass View Post

yeah RAID 5 would be the way to go for a samll array, the risk of a dual disk faliure increases as the number of disks increases thumb.gif

you can mitigate that risk further by buying disks from different batches. Thus eliminating the chance of buying two or more disks from dodgy batches / manufacturers.
post #13 of 19
Thread Starter 
Quote:
Originally Posted by Plan9 View Post

The opening post does though - hence my comment rolleyes.gif
yup. that would work fine
Personally I'd get 3x 1TB drives now and raidz them as with only 2x 1TB the most you can have is 1TB of mirrored storage. With 3x 1TB raidz, you can have ~1.9TB of storage plus still have 1 disk redundancy (ie 1 disk can die and you wont lose your data).
Sadly you cannot convert a mirror into a raidz, so you basically have to decide now else have a painful upgrade cycle (or just keep buying 2x drives and keep adding mirrors to your pool - which could be an option as well. but that will work out more expensive in the long run)

I know these are famous words, but I don't anticipate more than 1 disk failing at once. Also, if 1 disk fails i'll shut down the server until i can get a replacement.

I see what you mean about 3x1TB. It seems more likely i'll do that. Can you mix HDD sizes with ZFS? I already have a spare 1TB sitting on my desk completely blank and not doing anything. Could I combine that with 2x2TBs?

Edit: oh wow. FreeNAS actually recommend using 6GB of RAM with ZFS. Maybe now is the time to over-buy RAM.
Edited by Boyboyd - 2/27/12 at 4:56am
post #14 of 19
Quote:
Originally Posted by Boyboyd View Post

I know these are famous words, but I don't anticipate more than 1 disk failing at once. Also, if 1 disk fails i'll shut down the server until i can get a replacement.
In an enterprise environment, it's something you'd have to consider. But for what you're doing, I 100% agree with you.
Quote:
Originally Posted by Boyboyd View Post

I see what you mean about 3x1TB. It seems more likely i'll do that. Can you mix HDD sizes with ZFS? I already have a spare 1TB sitting on my desk completely blank and not doing anything. Could I combine that with 2x2TBs?
You could, but it's messy.
You could have the two 2TB disks partitioned with two 1TB empty partitions. So you then have four 1TB partitions across two disks and one 1TB disk.

Next you'd create a raidz between the two of the 1TB partitions and the 1TB disk. (this will give you just under 2TB of storage). Now you need to mirror your last two partitions on either disk, to give you another 1TB of storage. So you'll have ~2.8TB of storage.

hopefully this table explains my point better:
Code:
-----------------------------------------------------------------
|    2TB Disk    |    2TB Disk    |    1TB Disk    | RAID array |
|--------------------------------------------------|------------|
| 1TB Partition  | 1TB Partition  | whole disk     | raidz      |
| 1TB Partition  | 1TB Partition  | n/a            | mirror     |
-----------------------------------------------------------------

If my calculations are correct, then if you had 4x 2TB disks then you'd have ~3.8TB of storage rather than ~2.8TB using your method.
Quote:
Originally Posted by Boyboyd View Post

Edit: oh wow. FreeNAS actually recommend using 6GB of RAM with ZFS. Maybe now is the time to over-buy RAM.
To be honest, that's news even to me
Edited by Plan9 - 2/27/12 at 5:11am
post #15 of 19
3.8TB not 7.8TB (essentially you'd gain 1TB by buying another 2TB HDD). However it would also be a massively easier set up as you'd have to do my ZFS pool suggestion in the command line (as it's rather bespoke) but you could do the 3x 2TB via FreeNAS's GUI.

Sorry for the follow up post, but OSN seems to have developed a glitch where my edits do not show
post #16 of 19
Thread Starter 
Quote:
Originally Posted by Plan9 View Post

In an enterprise environment, it's something you'd have to consider. But for what you're doing, I 100% agree with you.
You could, but it's messy.
You could have the two 2TB disks partitioned with two 1TB empty partitions. So you then have four 1TB partitions across two disks and one 1TB disk.
Next you'd create a raidz between the two of the 1TB partitions and the 1TB disk. (this will give you just under 2TB of storage). Now you need to mirror your last two partitions on either disk, to give you another 1TB of storage. So you'll have ~2.8TB of storage.
hopefully this table explains my point better:
Code:
-----------------------------------------------------------------
|    2TB Disk    |    2TB Disk    |    1TB Disk    | RAID array |
|--------------------------------------------------|------------|
| 1TB Partition  | 1TB Partition  | whole disk     | raidz      |
| 1TB Partition  | 1TB Partition  | n/a            | mirror     |
-----------------------------------------------------------------
If my calculations are correct, then if you had 4x 2TB disks then you'd have ~3.8TB of storage rather than ~2.8TB using your method.

Ok then i'll just stick to 1TB drives. The more I look into ZFS and RAIDz the more i'm convinced it's the way to go. Thanks for bringing raidz to my attention.
post #17 of 19
Quote:
Originally Posted by Boyboyd View Post

Ok then i'll just stick to 1TB drives. The more I look into ZFS and RAIDz the more i'm convinced it's the way to go. Thanks for bringing raidz to my attention.

No problem mate. smile.gif
post #18 of 19
The e-350 APU boards are actually pretty neat. You could theoretically use it for a HTPC and file server in combo. I think the MSI board for less than $80 also has 4x SATA 3 ports as well.
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post #19 of 19
Thread Starter 
Quote:
Originally Posted by dizzy4 View Post

The e-350 APU boards are actually pretty neat. You could theoretically use it for a HTPC and file server in combo. I think the MSI board for less than $80 also has 4x SATA 3 ports as well.

I did have a little look into fusion, but i found it to be a bit more expensive than the MSI AM3 with 6 ports and the sempron 145.

I've gotten the physical side of it down to £340 for everything. £160 of that is HDDs frown.gif
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