Re: booting off a ZFS pool consisting of multiple striped mirror vdevs

[Matt Reimer]

On Sat, Feb 13, 2010 at 12:04 PM, Dan Naumov dan.nau...@gmail.com wrote:

 Hello

 I have succesfully tested and used a full ZFS install of FreeBSD 8.0
 on both single disk and mirror disk configurations using both MBR and
 GPT partitioning. AFAIK, with the more recent -CURRENT and -STABLE it
 is also possible to boot off a root filesystem located on raidz/raidz2
 pools. But what about booting off pools consisting of multiple striped
 mirror or raidz vdevs? Like this:

 Assume each disk looks like a half of a traditional ZFS mirror root
 configuration using GPT

 1: freebsd-boot
 2: freebsd-swap
 3: freebsd-zfs

 |disk1+disk2| + |disk3+disk4| + |disk5+disk6|

 My logic tells me that while booting off any of the 6 disks, boot0 and
 boot1 stage should obviously work fine, but what about the boot2
 stage? Can it properly handle booting off a root filesystem thats
 striped across 3 mirror vdevs or is booting off a single mirror vdev
 the best that one can do right now?


I don't know, but I plan to test that scenario in a few days.

Matt
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Re: booting off GPT partitions

[Matt Reimer]

On Wed, Jan 27, 2010 at 8:45 AM, Dan Naumov dan.nau...@gmail.com wrote:

 Hey

 I was under the impression that everyone and their dog is using GPT
 partitioning in FreeBSD these days, including for boot drives and that
 I was just being unlucky with my current NAS motherboard (Intel
 D945GCLF2) having supposedly shaky support for GPT boot. But right now
 I am having an email exchange with Supermicro support (whom I
 contacted since I am pondering their X7SPA-H board for a new system),
 who are telling me that booting off GPT requires UEFI BIOS, which is
 supposedly a very new thing and that for example NONE of their current
 motherboards have support for this.

 Am I misunderstanding something or is the Supermicro support tech
 misguided?


I'm booting servers with SuperMicro X8STi-F motherboards just fine using
pmbr + GPT + ZFS.

Matt
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