I have a couple of questions and concerns about using ZFS in an environment
where the underlying LUNs are replicated at a block level using products like
HDS TrueCopy or EMC SRDF. Apologies in advance for the length, but I wanted
the explanation to be clear.
(I do realise that there are other
Steve McKinty wrote:
> I have a couple of questions and concerns about using ZFS in an environment
> where the underlying LUNs are replicated at a block level using products like
> HDS TrueCopy or EMC SRDF. Apologies in advance for the length, but I wanted
> the explanation to be clear.
>
> (I
Great questions.
> 1) First issue relates to the überblock. Updates to
> it are assumed to be atomic, but if the replication
> block size is smaller than the überblock then we
> can't guarantee that the whole überblock is
> replicated as an entity. That could in theory result
> in a corrupt über
Steve McKinty wrote:
1) First issue relates to the überblock. Updates to it are assumed to be atomic, but if the replication block size is smaller than the überblock then we can't guarantee that the whole überblock is replicated as an entity. That could in theory result in a corrupt überbl
Steve,
> I have a couple of questions and concerns about using ZFS in an
> environment where the underlying LUNs are replicated at a block
> level using products like HDS TrueCopy or EMC SRDF. Apologies in
> advance for the length, but I wanted the explanation to be clear.
>
> (I do realise
Hi all,
Thanks for the replies.
To clear up one issue, when I mentioned snapshots, I [i]was[/i] talking about
snapshots performed by the array and/or replication software. In order to take
a ZFS snapshot I would need access to the secondary copies of the data, and
that is not generally possibl