All,
I don't know if this helps, but at a former company, we used the Sun
Stor[edge|argeTek] Availability Suite for UFS Filesystems. The suite includes a
remote mirror functionality. This would be what you are looking for.
Unfortunatly, I guess there is now ZFS support and it cost $$$.
Here's the information:
http://www.sun.com/storagetek/management_software/data_protection/availability/
Hello Sun, where is the opensource version? Where is ZFS support? Where's the
free to use without support license?
As the Availability Suite Project & Technical Lead, I will take this
opportunity to say that in January '07, all of the Sun StorageTech
Availability Suite (AVS) software is going into OpenSolaris!
This will include both the Remote Mirror (SNDR) and Point-in-Time Copy
(II) software, which runs on OpenSolaris supported hardware platforms of
SPARC, x86 and x64.
AVS, being both file system and storage agnostic, makes AVS very capable
of replicating and/or taking snapshots of UFS, QFS, VxFS, ZFS, Solaris
support databases (Oracle, Sybase, etc.), contained on any of the
following types of storage: LUNs, SVM & VxVM volumes, lofi devices, even
ZFS's zvols.
So going back to the initial posting...
I've been looking around for some ideas on how to create a nearly real-time
mirrored configuration between independent storage systems. A good example
would be 2 Thumpers. I'd like to get to a place where if I needed to take one
offline I could do it without having to take an outage for replications to
occur.
The ideas I've come up with this far aren't good ones. Everything from
rsycn'ing (or zfs send) every 5 minutes from cron (assuming a single run could
even run that quickly) to using port mirroring to split each incoming
transaction to 2 systems. Software ideas, like writing an NFS intercepter that
takes incoming transactions and then sends one to disk and another to the
standby system, are fun to think about but definitely not practical.
The NetApp style snapmirror method (ie: zfs send on a regular rotation) is only
so exciting because any failover looses a good amount of data making it a good
backup method but definitely not transparent.
Has anyone rolled over a good way to do this? I'd love to have a dialog on the
topic and see what ideas bubble up.
The SNDR portion of Availability Suite, is very capable of replicating
ZFS. Due to the nature of ZFS itself, the unit of replication or
snapshot is a ZFS storage pool, not a ZFS file system. The relationship
between the number of file systems in each storage pools is left to the
discretion of the system administrator, being 1-to-1 (like older file
systems), or many-to-1 (as is now possible with ZFS).
SNDR can replicate any number of ZFS storage pools, where each of the
vdevs in the storage pool (zpool status <name>), must be configured
under a single SNDR I/O consistency group. Once configured, the
replication of ZFS, like all other Solaris supported file systems, works
with both synchronous and asynchronous replication, the latter using
either memory queues or disks queues.
This product set is well documented and can seen at
http://docs.sun.com/app/docs?p=coll%2FAVS4.0
The current release notes for AVS 4.0 are located at
http://docs.sun.com/source/819-6152-10/AVS_40_Release_Notes.html
More details will be forthcoming in January, so please keep a look out
for Sun StorageTech Availability Suite in 2007!
Regards,
Jim Dunham
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