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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.

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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