mike wrote: > > > Sorry :) > > Okay, so you can create a zpool from multiple vdevs. But you cannot > add more vdevs to a zpool once the zpool is created. Is that right? Nope. That's exactly what you *CAN* do.
So say today you only really need 6TB usable, you could go buy 8 of your 1TB disks, and setup a pool with a single 7 disk RAIDZ1 vDev, and a single spare today. Later when disks are cheaper, and you need the space you could add a second 7 disk RAIDZ1 to the pool. This way you'd gradually grow into exaclty the example you gave earlier. Also while it makes sense to use the same size drives in the same vDev, additional vDevs you add later can easily be made from different size drives. For the exaple above, when you got around to adding the second vDev, 2TB disks might be out, for the same space, you could create a vDev with fewer 2TB drives, or a vDev with the same number of drives and add twice the space, or some combo inbetween - Just because oyur first vDev had 7 disks doesn't mean the others have to. Antoher note, as someone said earlier, if you can go to 16 drives, you should consider 2 8disk RAIDZ2 vDevs, over 2 7disk RAIDZ vDevs with a spare, or (I would think) even a 14disk RAIDZ2 vDev with a spare. If you can (now or later) get room to have 17 drives, 2 8disk RAIDZ2 vDevs with a spare would be your best bet. And remember you can grow into it... 1 vDev and spare now, second vDev later. -Kyle > That's what it sounded like someone said earlier. > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
