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Re: [zfs-discuss] Size discrepancy (beyond expected amount?)

Subject: Re: [zfs-discuss] Size discrepancy beyond expected amount?
From: Richard Elling
Date: Thu, 19 Mar 2009 17:28:34 -0700
Bob Friesenhahn wrote:
On Thu, 19 Mar 2009, Harry Putnam wrote:
I've created a zpool in raidz1 configuration with:

 zpool create  zbk raidz1  c3d0 c4d0 c4d1

This is not a very useful configuration. With this number of disks, it is best to use two of them to build a mirror, and save the other disk for something else (e.g. to build a mirrored root pool). Mirrors perform better, are more fault tolerant, and are easier to administer.

With five disks, raidz1 becomes useful.

+1
also remember that you can add mirrors later.  For best data availability,
start with 2 mirrored disks, each split in half.  As your data requirements
grow, add mirrored halves.  For diversity, make each side (half) of the
mirror be on different disks.
-- richard

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