[OpenIndiana-discuss] data on rpool - Bad idea?

[Michael Hase]

On Sat, 7 Feb 2015, Harry Putnam wrote:

> I've read that it is a bad idea to have datasets on the same disc
> that rpool is on.  I'm not sure why that is so.
>
> In my current situation I need more space but to rig up my
> `HP xw8600 workstation' with more disc space will require getting a cage
> and some new discs, not to mention the huffing and puffing necessary
> to get it all installed and usable.

I'd recommend one of these 4x2.5" sata/sas bays and an additional cheap 
lsi sas hba. I use 2 2.5" 36gb sas disks as rpool, 4 3.5" data disks, and 
an additional ssd for zil. Some spare laptop sata disks can be used for 
rpool, too. Fitted nicely in my old hp xw8400.

In the meantime all disks and the 4x2.5" bay migrated to a xeon e3 box (no 
reinstall necessary), as these old hp boxes are way to expensive to run 
24x7 here in germany.

Cheers,
Michael

>
> When I installed oi on this hardware I thought it was a smart idea to
> use 2 older 250 GB discs for a 2 disc mirrored setup of rpool.  And a
> pair of 1tb discs for 2disc mirror of datasets.
>
> At that time I hadn't really realized what it would take to add
> discs.
>
> But of course I'm now running out of space... and still not flush
> enough to pop for the $400 or so to add a cage and 4 2-3 tb discs.
>
> However I do have 2 1tb discs laying unused.
>
> So, (finally cutting to chase) how bad of an idea would it be to use
> those two 1tb discs for a mirrored rpool and whatever data.
>
> I would gain about 800-850 GB of mirrored data space but it would
> involve putting data on same discs and rpool.
>
> (I'll leave for another thread to discuss how to get rpool onto the new
> discs in the most painless manner)
>
> So, what are your best thoughts on employing the two 1tb discs as
> described above?
>
>
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