Thanks Brett. I wasn't aware of RaidZ's limitation on adding devices.
A quick scan of the BTRFS documentation shows that it doesn't have the same limitation. However, raid 5 and 6 are still listed as having significant issues with data recovery and should be used for testing purposes only. [1] Given my plan is to increase capacity by adding, rather than replacing, drives it looks like an mdadm managed raid 5/6 pool might be the better option. [1] https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices On Sat, Dec 6, 2014 at 2:02 PM, Brett Pemberton <[email protected]> wrote: > On Sat, Dec 6, 2014 at 9:16 AM, Tim Hamilton <[email protected]> > wrote: > > I'm in need of a PCIe SATA controller that works well under linux and > > supports BTRFS / ZFS raid arrays to be used in a home NAS I'm building > and > > am no sure what I'm looking for. > > > > My current need is only for a single additional SATA port but my > preference > > is for a card that will support future expansion > > Keep in mind, with ZFS for example, you can't do like mdadm, and just > add a drive to a RAID5/6 array and reshape, growing to use more > devices. > > Your best bet is to start off with the maximum number of drives you > plan to use, and upgrade capacities, instead of adding more devices. > Can't comment on BTRFS. > > FWIW, I've bought a few of these over the years: > > http://www.msy.com.au/vic/pascoevale/peripherals/8896-channel-pes3a-020-pci-e-2-port-sataiii-card.html > > Work fine under Linux/FreeBSD. No complaints. Cheap. > > / Brett > -- Vote NO in referenda.
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