[OpenIndiana-discuss] ZFS tolerance

[Michelle]

Hi Till,

Thanks for the feedback.

I'm deliberately trying to push the envelope. I believe that ZFS will
act as a buffer between drives and run at the slowest device speed, but
I'm wondering if there is a threshold where ever ZFS will throw up its
hands and give up.

I'm trying to make a ZFS pool focused on resilience, while using drives
that are already laying around. Performance is understandably going to
take a hit.

The vision is a pool consisting of a number of mirrored vdevs.

I mean... if I had a load of hard drives on SATA and connected another
drive via SATA to USB adaptor, would ZFS still handle it and slow down,
or would it throw a fit?

Many thanks,

Michelle.


On Sat, 2022-10-29 at 12:33 -0300, Till Wegmueller wrote:
> Hi
> 
> It can get yarring. Try to make raids with drives that are similar
> and 
> combine them into a mutt pool then you should get the least effect. 
> Otherwise the slowest drive may dictate the pools performance.
> 
> There are more tuning options, but I hope this helps a little.
> Greetings
> Till
> 
> On 29/10/2022 10.36, Michelle wrote:
> > Hi All,
> > 
> > I am doing a small idiotic project, putting together odds and sods
> > of
> > hard drives to make a RAID set. You know the kind of thing, the
> > hard
> > drives that are remnants of old projects but you don't want to
> > throw
> > them out because... well... they work!
> > 
> > So I was wondering that in a pile of hard drives, 5400 to 7200 RPM,
> > green and red drives than spin down and up again, and blue/black
> > drives
> > that keep running....
> > 
> > Just how much tolerance does ZFS have regarding the timings of
> > using
> > different devices? Particularly when under sustained transfer to
> > the
> > server.
> > 
> > My target will be RAID 0+1 with partitions on larger drives, to
> > pair
> > against smaller drives.
> > 
> > Grateful for any thoughts/information please.
> > 
> > Many thanks,
> > 
> > Michelle.
> > 
> > 
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