i don't think it's the same at all.
I think it's about the same as filling a radiator in a car with oatmeal to
make it stop leaking.
On Sun, Sep 6, 2009 at 6:26 PM, Bob Friesenhahn <
bfrie...@simple.dallas.tx.us> wrote:
> On Sun, 6 Sep 2009, Thomas Burgess wrote:
>
>>
>> if you add a raidz group
On Sun, 6 Sep 2009, Thomas Burgess wrote:
if you add a raidz group to a group of 3 mirrors, the entire pool slows down
to the speed of the raidz.
while you technically CAN do it, it's a horrible idea.
I don't think it is necessarily as horrid as you say. Zfs does
distribute writes to fa
On Sep 6, 2009, at 11:19 AM, Al Lang wrote:
The "limitations" section of the Wikipedia article on ZFS currently
includes the statement:
"You cannot mix vdev types in a zpool. For example, if you had a
striped ZFS pool consisting of disks on a SAN, you cannot add the
local-disks as a mi
On Sep 6, 2009, at 3:32 PM, Thomas Burgess wrote:
yes, but it stripes across the vdevs, and when it needs to read data
back, it will absolutely be limited.
During reads the raidz will be the fastest vdev, during writes it
should have about the same write performance as any one mirror vd
yes, but it stripes across the vdevs, and when it needs to read data back,
it will absolutely be limited.
On Sun, Sep 6, 2009 at 3:14 PM, Mario Goebbels wrote:
> if you add a raidz group to a group of 3 mirrors, the entire pool slows
>> down to the speed of the raidz.
>>
>
> That's not true
if you add a raidz group to a group of 3 mirrors, the entire pool slows
down to the speed of the raidz.
That's not true. Blocks are being randomly spread across all vdevs.
Unless all requests keep pulling blocks from the RAID-Z, the speed is a
mean of the performance of all vdevs.
-mg
__
you can't without forcing...and even if you do, it's not a good idea.
if you do your pool will have the lowest redundancy/speed of the worst
one...
sooo if you add a single drive to a raidz vdev, your entire pool loses it's
redundancy, if you add a single drive to a mirror, likewise
if you add
The "limitations" section of the Wikipedia article on ZFS currently includes
the statement:
"You cannot mix vdev types in a zpool. For example, if you had a striped
ZFS pool consisting of disks on a SAN, you cannot add the local-disks as a
mirrored vdev."
As I understand it, this is simply
