NB. the zpool(1m) man page provides a rather extensive explanation of vdevs.
[EMAIL PROTECTED] wrote: > > There are several types of vdevs: > > wow, outstanding list Kyle! > > > suggested that there is little benefit to having 10 > > or more devices in a RAIDZ vdev. > > the tgx is split between vdevs, the blocks to the single > raidz vdev is divided by the data elements in the raidz > set, so lets say its 128k, with a 4+1 raidz set > each disk will see 32k. so the 9+1 would get 14.2k. > and what if the block is less than 128k? wouldn't > it be better to have two sets of 4+1 and go > twice as fast splitting the blocks less in the > process? (two vdevs) That is not exactly how it works. You are describing RAID-5, not raidz. raidz is dynamic and does not require that the data is spread across all vdevs in the set. This becomes more important as you get to large numbers (which is not recommended) such as 47+1. However, your conclusion is correct: it is generally better for performance to have qty 2 of 4+1 rather than qty 1 of 9+1. -- richard _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
