[zfs-discuss] raidz-1 vs mirror

2009-11-11 Thread Thomas Maier-Komor
Hi everybody, I am considering moving my data pool from a two disk (10krpm) mirror layout to a three disk raidz-1. This is just a single user workstation environment, where I mostly perform compile jobs. From past experiences with raid5 I am a little bit reluctant to do so, as software raid5 has

Re: [zfs-discuss] raidz-1 vs mirror

2009-11-11 Thread Rob Logan
from a two disk (10krpm) mirror layout to a three disk raidz-1. wrights will be unnoticeably slower for raidz1 because of parity calculation and latency of a third spindle. but reads will be 1/2 the speed of the mirror because it can split the reads between two disks. another way to say the

Re: [zfs-discuss] raidz-1 vs mirror

2009-11-11 Thread Bob Friesenhahn
On Wed, 11 Nov 2009, Rob Logan wrote: from a two disk (10krpm) mirror layout to a three disk raidz-1. wrights will be unnoticeably slower for raidz1 because of parity calculation and latency of a third spindle. but reads will be 1/2 the speed of the mirror because it can split the reads

Re: [zfs-discuss] raidz-1 vs mirror

2009-11-11 Thread Richard Elling
On Nov 11, 2009, at 4:30 PM, Rob Logan wrote: from a two disk (10krpm) mirror layout to a three disk raidz-1. wrights will be unnoticeably slower for raidz1 because of parity calculation and latency of a third spindle. but reads will be 1/2 the speed of the mirror because it can split