HPC and zfs.
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Mon Feb 6 17:39:18 UTC 2012
On Mon, 6 Feb 2012, Michael Fuckner wrote:
>
> Another thing to think about is CPU: you probably need weeks for a rebuild of
> a single disk in a Petabyte Filesystem- I haven't tried this with ZFS yet,
> but I'm really interested if anyone already did this.
Why would a disk rebuild take longer for a petabyte filesystem rather
than a tens of gigabytes filesystem?
The time to rebuild the disk primarily depends on the RAID type used
for the zfs vdev (mirrors, raidz1, raidz2, raidz3), how many disks
there are in the vdev, the degree of fragmentation, the amount of data
stored on that disk, and the disk seek times.
In a huge system, it makes sense to be more conservative about the zfs
vdev design, and use more vdevs with fewer disks per vdev. Using
anything less than raidz2 would be an error.
Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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