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Re: [zfs-discuss] Size discrepancy (beyond expected amount?)

Subject: Re: [zfs-discuss] Size discrepancy beyond expected amount?
From: Blake
Date: Thu, 19 Mar 2009 18:57:26 -0400
IIRC, that's about right.  If you look at the zfs best practices wiki
(genunix.org I think?), there should be some space calculations linked
in there somewhere.

On Thu, Mar 19, 2009 at 6:50 PM, Harry Putnam <reader@xxxxxxxxxxx> wrote:
> I'm finally getting close to the setup I wanted, after quite a bit of
> experimentation and bugging these lists endlessly.
>
> So first, thanks for your tolerance and patience.
>
> My setup consists of 4 disks. ÂOne holds the OS (rpool) and 3 more all
> the same model and brand, all 500gb.
>
> I've created a zpool in raidz1 configuration with:
>
> Âzpool create Âzbk raidz1 Âc3d0 c4d0 c4d1
>
> No errors showed up and zpool status shows no problems with those
> three:
> Â pool: zbk
> Âstate: ONLINE
> Âscrub: none requested
> Âconfig:
>
> Â Â Â ÂNAME Â Â Â ÂSTATE Â Â READ WRITE CKSUM
>    Âzbk     ONLINE    0   0   0
> Â Â Â Â Âraidz1 Â ÂONLINE Â Â Â 0 Â Â 0 Â Â 0
> Â Â Â Â Â Âc3d0 Â ÂONLINE Â Â Â 0 Â Â 0 Â Â 0
> Â Â Â Â Â Âc4d0 Â ÂONLINE Â Â Â 0 Â Â 0 Â Â 0
> Â Â Â Â Â Âc4d1 Â ÂONLINE Â Â Â 0 Â Â 0 Â Â 0
>
>
> However, I appear to have lost an awfull lot of space... even above
> what I expercted.
>
> Âdf -h
> [...]
> Âzbk          913G  26K Â913G  1% /zbk
>
> It appears something like 1 entire disk is gobbled up by raidz1.
>
> The same disks configured in zpool with no raidz1 Âshows Â1.4tb with df.
>
> I was under the impression raidz1 would take something like 20%.. but
> this is more like 33.33%.
>
> So, is this to be expected or is something wrong here?
>
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>
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