Thank you all for your help. It appears my understanding of parity was rather limited. I kept on thinking about parity in memory where the extra bit would be used to ensure that the total of all 9 bits is always even.
In case of zfs, the above type of checking is actually moved into checksum. What zfs calls parity is much more than a simple check. No wonder it takes more space. One question though. Marty mentioned that raidz parity is limited to 3. But in my experiment, it seems I can get parity to any level. You create a raidz zpool as: # zpool create mypool raidzx disk1 diskk2 .... Here, x in raidzx is a numeric value indicating the desired parity. In my experiment, the following command seems to work: # zpool create mypool raidz10 disk1 disk2 ... In my case, it gives an error that I need at least 11 disks (which I don't) but the point is that raidz parity does not seem to be limited to 3. Is this not true? Thank you once again for your help. Regards, Peter -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
