On 11 August, 2008 - Martin Svensson sent me these 0,9K bytes: > I read this (http://blogs.sun.com/roch/entry/when_to_and_not_to) blog > regarding when and when not to use raidz. There is an example of a plain > striped configuration and a mirror configuration. (See below) > > M refers to a 2-way mirror and S to a simple dynamic stripe. > > Config Blocks Available Random FS Blocks /sec > ------------ ---------------- --------- > M 2 x (50) 5000 GB 20000 > S 1 x (100) 10000 GB 20000 > > Granted, the simple striped configuration is fast, and of course with > no redundancy. But I don't understand how a mirrored configuration can > perform as good when you sacrifice half of your disks for redundancy. > Doesn't a mirror perform as one device? Can someone please clarify the > example from the above, I think I am missing something?
This is when reading.. and since both disks contain the same data, you can pick either of them.. For reading block a and b, you can read a from disk 1 and b from disk 2 at the same time.. /Tomas -- Tomas Ögren, [EMAIL PROTECTED], http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
