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 spare. With an unsilvered spare, you have no redundancy until the resilver completes, and if there are latent errors in the remaining non-redundant disks you may lose data. Other choices: - 4way raidz3 - 4way mirror Same space and fault tolerance, different performance. This is an easier choice, closer (but still not completely) to the nonsensical. Another choice again: - 2 separate pools, each a 2-disk mirror Data in one pool, backed up regularly by snapshot replication to the second. Same space as a 4-way mirror, but this has tolerance to some other kinds of problems that a single pool does not. Better still would be a backup pool in another machine/site. Perhaps the disks you are replacing can go to this purpose? -- Dan.
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