On Thu, 12 Oct 2006, Brian Hechinger wrote:
> Ok, previous threads have lead me to believe that I want to make raidz
> vdevs [0] either 3, 5 or 9 disks in size [1]. Let's say I have 8 disks.
> Do I want to create a zfs pool with a 5-disk vdev and a 3-disk vdev?
Personally I think that 5 disks for raidz is the "sweet spot". With the
remaining 3 disks, consider a 3-way mirror if redundancy is more important
than space. This will give you two pools with different operational
characteristics.
> Are there performance issues with mixing differently sized raidz vdevs
> in a pool? If there *is* a performance hit to mix like that, would it
Can you tell us what size your disks are?
> be greater or lesser than building an 8-disk vdev?
In this situation a little experimenting will probably answer all your
questions. ZFS is so quick at, well, at everything, that its fun and
productive to experiment with different disk configurations.
> -brian
>
> [0] - Just for clarity, what are the "sub-pools" in a pool, the actual
> raidz/mirror/etc "containers" called. What is the correct term to refer
> to them? I don't want any extra confusion here. ;)
>
> [1] - For RAID-Z. How does RAID-Z2 effect this?
For raidz2, the corresponding #s would be 4,6 and 10 (not recommended)
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris.Org Community Advisory Board (CAB) Member - Apr 2005
OpenSolaris Governing Board (OGB) Member - Feb 2006
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