Newbie - Hard drive configuration

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Newbie - Hard drive configuration

Post by Fredje_B » Sat Sep 22, 2012 10:57 am

Hello all,

I'm pretty newbie with ZFS...I'm already using Zevo Silver edition for month but on its easy way (with the GUI)...I have just see that it was possible to manage pool of many drives with the command line...too late, I'm going now to use ZFS Community edition ;-)

I'm actually having questions about which configuration I would best use to make my pools. I have the following drive :
2 x 500Go
3 x 2To
1 x 3To

No probs for the 2x500Go...I will use it as a mirrored pool for my images (+ Backup on CrashPlan for the security).

But for the other drives, I want to make a RAIDZ-1 pool with the rest of the drives...how will ZFS manage it? Is it going to shrink my 3To to a 2To drive or will it be fully used? Quid also of the spare drive in a mixed config of hard drives? How much space for data will it give on the end?

I'm also planning to buy a new 3To to add to this pool because I'm running out of space!...is it a good idea to expand this spool like this?

Are there other scenario possible?

Thanks.
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Re: Newbie - Hard drive configuration

Post by grahamperrin » Sat Nov 24, 2012 8:05 am

I guess that you could:

  • give a 2To slice of the 3To device to the RAID-Z1 pool
  • use the remainder of the 3To device for something else, but avoid mixing with HFS Plus on a single hard disk.

At the moment I can't find the reference documentation that I want (AFAIR something about aiming for same sizes, with not too much attention to differences between other characteristics). Other items that may be of interest:

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Post by grahamperrin » Mon Jan 14, 2013 2:28 am

There's a comment by witek under How to improve ZFS performance | ICESQUARE - Solve Computer Server Problems, Computer Help, Server Support, Server Help (2012-04-18, highlights):

> … can mix different sizes and speeds of devices as top-level …

> … should not mix different sizes and speeds in single vdev, like mirror or raidz2 …

Aaron Toponce : ZFS Administration, Part VIII- Zpool Best Practices and Caveats (2012-12-13)

One of a series of eighteen articles.

grahamperrin wrote:… something about aiming for same sizes, with not too much attention to differences between other characteristics …


Where I got that idea, I don't know. In the absence of a reference, it's probably best to ignore that line.
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