Why not just do simple mirrored vdevs? or use cheaper 1tb drives for the second vdev? I don't know....it's up to you...To me the benefits of ZFS far outweigh the limitations. Also, in my opinion, when you are expanding your storage, it's a good idea to add it in chunks like this...adding a 4 drive vdev is the way *I* do it right now....though i use 1tb drives because the 2tb drives aren't worth it atm.
1tb drives are around 80 bucks and 7200 rpm, 2tb drives are 250-300 and 5400 rpm...for the cost of 2 2tb drives you could EASILY add vdevs of 1tb drives... On Mon, Aug 10, 2009 at 7:03 AM, Chester <no-re...@opensolaris.org> wrote: > Thanks for the info so far. Yes, I understand that you can add more vdevs, > but at what cost? With the 2TB drives costing $300 each, I wanted to get > more or less the bare minimum and then add more drives once I filled the > capacity. I understand that raidz1 is similar to RAID5 (it can recover from > a single drive failure) and raidz2 is similar to RAID6 (recovery from up to > two drive failures). Since I have four drives now, I would leave that with > single parity and probably the next time I added a drive, I would migrate > over to double parity. > > In your scenario, once I fill up my storage capacity, I would need to add > another three drives; therefore dedicating two drives for parity (one for > the four disk set and one for the three disk set), which would be similar to > my plan of moving to double parity. However, what about after that? Three > drives dedicated to single parity for three different sets? Certainly, I > would get to a point where I wouldn't want 16 drives constantly spinning and > I would hope by then either solid state disks have moved up in storage size > and down in terms of price so I could start cutting over to those. > > Is there a way to expand the zpool to take advantage of the increased size > of the hardware once I add a disk on the 3ware controller? I looked > zfsadmin document and see an autoexpand property, but that feature doesn't > appear to be support by OpenSolaris. > -- > This message posted from opensolaris.org > _______________________________________________ > 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
