> > Either way you can create a > > RAID5/raidz with the drives and use excess space > as > > non-redundant storage. So pick your poison! > > RAIDZ is NOT RAID5. The two are almost radically > different. > > For example, RAID5 MUST have at least three disks, > RAIDZ can work with only two. > > All disks in a RAID5 config MUST be the same size, > RAIDZ will take any size disks, although it will warn > about it, it will work. > > RAID5 suffers from a write hole which can happen if a > power outage occurs, RAIDZ has no such weakness. > > RAID5 must read the data in before the data is > written out to recalculate the parity - partial > writes KILL RAID5 write performance, RAIDZ always > does full stripe width writes because stripes are > dynamic. > > Point: do not be too quick to use RAID5 and RAIDZ > interchangeably - similarities are only superficial, > just like apples and pears are not the same fruit.
You could have just linked the docs if you want to put on a ZFS clinic :) He was simply trying to decide how to allocate his disk space. From the user's perspective, RAIDz and RAID5 operate the same way. The end. This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org
