Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-20 Thread Eric Andersen
I went through this determination when setting up my pool. I decided to go with mirrors instead of raidz2 after considering the following: 1. Drive capacity in my box. At most, I can realistically cram 10 drives in my box and I am not interested in expanding outside of the box. I could go

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-20 Thread Bob Friesenhahn
On Sat, 20 Mar 2010, Eric Andersen wrote: 2. Taking into account the above, it's a great deal easier on the pocket book to expand two drives at a time instead of four at a time. As bigger drives are always getting cheaper, I feel that I have a lot more flexibility with mirrors when it

[zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread homerun
Greetings I would like to get your recommendation how setup new pool. I have 4 new 1.5TB disks reserved to new zpool. I planned to crow/replace existing small 4 disks ( raidz ) setup with new bigger one. As new pool will be bigger and will have more personally important data to be stored long

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread taemun
A pool with a 4-wide raidz2 is a completely nonsensical idea. It has the same amount of accessible storage as two striped mirrors. And would be slower in terms of IOPS, and be harder to upgrade in the future (you'd need to keep adding four drives for every expansion with raidz2 - with mirrors you

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread Edho P Arief
On Fri, Mar 19, 2010 at 2:34 PM, taemun tae...@gmail.com wrote: A pool with a 4-wide raidz2 is a completely nonsensical idea. It has the same amount of accessible storage as two striped mirrors. And would be slower in terms of IOPS, and be harder to upgrade in the future (you'd need to keep

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread Daniel Carosone
On Fri, Mar 19, 2010 at 06:34:50PM +1100, taemun wrote: A pool with a 4-wide raidz2 is a completely nonsensical idea. No, it's not - not completely. It has the same amount of accessible storage as two striped mirrors. And would be slower in terms of IOPS, and be harder to upgrade in the

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread homerun
Thanks for comments So possible choises are : 1) 2 2-way mirros 2) 4 disks raidz2 BTW , can raidz have spare ? so is there one posible choise more : 3 disks raidz with 1 spare ? Here i prefer data availibility not performance. And if need sometime to expand / change setup it is then that time

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread Daniel Carosone
On Fri, Mar 19, 2010 at 12:59:39AM -0700, homerun wrote: Thanks for comments So possible choises are : 1) 2 2-way mirros 2) 4 disks raidz2 BTW , can raidz have spare ? so is there one posible choise more : 3 disks raidz with 1 spare ? raidz2 is basically this, with a pre-silvered

Re: [zfs-discuss] Q : recommendations for zpool configuration

2010-03-19 Thread David Dyer-Bennet
On Fri, March 19, 2010 02:28, homerun wrote: Greetings I would like to get your recommendation how setup new pool. I have 4 new 1.5TB disks reserved to new zpool. I planned to crow/replace existing small 4 disks ( raidz ) setup with new bigger one. As new pool will be bigger and will