ZFS: RAIDZ and RAIDZ2 usable size?
for RAIDZ(1) use the same formula as for RAID5. for RAIDZ2 - the same as for RAID6
Stefan Lasiewski
Stefan Lasiewski Daddy, Linux Guy, Bicyclist, Tinkerer, Fixer & Breaker of things. I work as a Senior SYstem Engineer at the National Energy Research Scientific Computing Center (NERSC) Division at Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA. Father of 3 cute children. Yes I'm a sysadmin and a parent. Heavy user of CentOS, RHEL & FreeBSD for production services at work. I also run Ubuntu at home, for the simplicity. I'm a fan of Apache HTTP Server, Nagios & Cacti. Original proposer of unix.stackexchange.com (Yes, this proposal predated askubuntu.com, and I wish they would have merged with the Unix proposal.).
Updated on September 17, 2022Comments
-
Stefan Lasiewski over 1 year
Is the usable size of a RAIDZ array similar to the usable size of a RAID5 array?
The RAID5 calculation is "(N-1) * S", where S is the size of smallest drive. Since most people use the same sized disk in a RAID5 array, this comes out to be "N-1" for most purposes.
Is RAIDZ also "(N-1) * Smin" ?
Similarly, RAID6 is (N-2) * S. Is the usable size of RAIDZ2 similar to RAID6?