Difference between revisions of "FAQ"

From OpenZFS on OS X
Jump to: navigation, search
(Q) Can I set copies=2 in lieu of using mirrors or raidz)
Line 19: Line 19:
 
'''A)''' Have to? No. Should you? Virtually always. ZFS will not be able to repair errors it finds unless you have redundancy at the vdev level.
 
'''A)''' Have to? No. Should you? Virtually always. ZFS will not be able to repair errors it finds unless you have redundancy at the vdev level.
  
===Q) Can I set copies=2 in lieu of using mirrors or raidz ===
+
===Q) Can I set copies=2 in lieu of using mirrors or raidz? ===
 
Setting copies=2 is a poor substitute for vdev-level redundancy. Two copies on a broken drive are worthless.
 
Setting copies=2 is a poor substitute for vdev-level redundancy. Two copies on a broken drive are worthless.
  

Revision as of 13:48, 15 April 2014


Besides the questions covered below, you may find Documentation and OpenZFS on OS X helpful. Both articles contain a good deal of information about OpenZFS on OS X.

General

Q) What is OpenZFS on OS X?

A) See the article entitled OpenZFS on OS X.

Q) What does O3X mean?

A) O3X = O O O X = OpenZFS on OS X.

Q) What version of ZFS do you use?

A) OpenZFS. Pool version 5000. File system version 5. Pool version 5000 is pool version 28 plus support for feature flags. We support pool version 5000 and pool versions less than or equal to 28. We do not support the closed-source Oracle Solaris ZFS pool versions 29 and up.

Best practices

Q) Do I have to use mirrors or raidz?

A) Have to? No. Should you? Virtually always. ZFS will not be able to repair errors it finds unless you have redundancy at the vdev level.

Q) Can I set copies=2 in lieu of using mirrors or raidz?

Setting copies=2 is a poor substitute for vdev-level redundancy. Two copies on a broken drive are worthless.

Administration

Q) How can I get rid of "The disk you inserted was not readable by this computer"?

A) See the article entitled Suppressing the annoying popup.

Q) How can I access the .zfs snapshot directories?

A) You need to set snapdir visible and manually mount a snapshot.

$ sudo zfs set snapdir=visible tank/bob
$ sudo zfs mount tank/bob@yesterday
$ ls -l /tank/bob/.zfs/snapshot/yesterday/

Q) Is .zfs snapdir auto-mounting supported?

A) No, not at this time. You must manually "zfs mount" snapshots manually to see them in the snapdir.

Q) OK, I manually mounted my snapshot but still cannot see it in Finder. What gives?

A) Currently mounted snapshots are only visible from Terminal, not from Finder.

$ ls -l /tank/bob/.zfs/snapshot/yesterday/

Interoperability

Q) Can I import my ZEVO pools?

A) Yes. O3X can import pool version 28, which means it can import ZEVO pools.

Q) Can I import my MacZFS pools?

A) Yes. O3X can import pool version 8, which means it can import MacZFS pools.

Limitations

Q) Can I boot my computer off of O3X?

A) No. O3X cannot be used as your main system partition.

Q) So if I use O3X, that means I don't need to back up, right?

A) Wrong. Wrong. Wrong.