FreeNAS 16TB problems

[Ian Scott]

Hey guys

I recently bought 4x 4TB HDDs and installed them. The max volume size I can get out of it is around 7TB. I only have 4GB of memory which is defiantly not enough, just wondering if that's why freenas wont allow me to have more than 7TB or that's what happeneds with using RaidZ2. I was hoping to get around 12TB, just need to know before I go and buy a heap of memory

Thanks

Ian

[Godlygamer23]

General rule of thumb is 1GB of RAM per 1TB of space. My FreeNAS server has 4GB of RAM, ~3.5GB of which is accessible to the system - I have 2TB of space and I am very close to running out of RAM.

Edited November 13, 2015 by Godlygamer23

[Shimejii]

it sounds like potentially two are not being seen because of your lack of ram and maybe just not being seen by the computer

[Ian Scott]

it sounds like potentially two are not being seen because of your lack of ram and maybe just not being seen by the computer

It's defiently seeing and using all 4 drives

[dalekphalm]

Hey guys

I recently bought 4x 4TB HDDs and installed them. The max volume size I can get out of it is around 7TB. I only have 4GB of memory which is defiantly not enough, just wondering if that's why freenas wont allow me to have more than 7TB or that's what happeneds with using RaidZ2. I was hoping to get around 12TB, just need to know before I go and buy a heap of memory

Thanks

Ian

Can I get a bit of clarification?

Are you running your 4x 4TB in a RAIDZ2?

 

RAIDZ2 is equivalent to RAID6.

 

That means: 2 drives are Data Drives, 2 drives are Parity Drives.

 

You're only getting ~8TB of usable space.

 

If you want 12TB of usable space, you need to do RAIDZ or RAIDZ1.

[braneopbru]

Can I get a bit of clarification?

Are you running your 4x 4TB in a RAIDZ2?

 

RAIDZ2 is equivalent to RAID6.

 

That means: 2 drives are Data Drives, 2 drives are Parity Drives.

 

You're only getting ~8TB of usable space.

 

If you want 12TB of usable space, you need to do RAIDZ or RAIDZ1.

Bingo.

 

Nothing to see here. Everything is as it should be.

 

Side note; GET MORE RAM. The consensus is really that you should have a MINIMUM of 8GB, regardless of how much storage you have. 

[tt2468]

Can I get a bit of clarification?

Are you running your 4x 4TB in a RAIDZ2?

 

RAIDZ2 is equivalent to RAID6.

 

That means: 2 drives are Data Drives, 2 drives are Parity Drives.

 

You're only getting ~8TB of usable space.

 

If you want 12TB of usable space, you need to do RAIDZ or RAIDZ1.

Like dalek said, RAIDZ2 is basically raid 6. You have 4 drives, splits them into 2 groups of 2. in each group, it forms what is basically a raid 1 with 2 disks. It then takes those 2 groups and forms what would be a raid0. So you get parity + striping.