+1
On Jan 26, 2007, at 8:26 AM, Jim Dunham wrote:
Project Overview:
I propose the creation of a project on opensolaris.org, to bring to
the community two Solaris host-based data services; namely volume
snapshot and volume replication. These two data services exist
today as the Sun StorageTek Availability Suite, a Solaris 8, 9 &
10, unbundled product set, consisting of Instant Image (II) and
Network Data Replicator (SNDR).
Project Description:
Although Availability Suite is typically known as just two data
services (II & SNDR), there is an underlying Solaris I/O filter
driver framework which supports these two data services. This
framework provides the means to stack one or more block-based,
pseudo device drivers on to any pre-provisioned cb_ops structure,
[ http://www.opensolaris.org/os/article/
2005-03-31_inside_opensolaris__solaris_driver_programming/
#datastructs ], thereby shunting all cb_ops I/O into the top of a
developed filter driver, (for driver specific processing), then out
the bottom of this filter driver, back into the original cb_ops
entry points.
Availability Suite was developed to interpose itself on the I/O
stack of a block device, providing a filter driver framework with
the means to intercept any I/O originating from an upstream file
system, database or application layer I/O. This framework provided
the means for Availability Suite to support snapshot and remote
replication data services for UFS, QFS, VxFS, and more recently the
ZFS file system, plus various databases like Oracle, Sybase and
PostgreSQL, and also application I/Os. By providing a filter driver
at this point in the Solaris I/O stack, it allows for any number of
data services to be implemented, without regard to the underlying
block storage that they will be configured on. Today, as a snapshot
and/or replication solution, the framework allows both the source
and destination block storage device to not only differ in physical
characteristics (DAS, Fibre Channel, iSCSI, etc.), but also logical
characteristics such as in RAID type, volume managed storage (i.e.,
SVM, VxVM), lofi, zvols, even ram disks.
Community Involvement:
By providing this filter-driver framework, two working filter
drivers (II & SNDR), and an extensive collection of supporting
software and utilities, it is envisioned that those individuals and
companies that adopt OpenSolaris as a viable storage platform, will
also utilize and enhance the existing II & SNDR data services, plus
have offered to them the means in which to develop their own block-
based filter driver(s), further enhancing the use and adoption on
OpenSolaris.
A very timely example that is very applicable to Availability Suite
and the OpenSolaris community, is the recent announcement of the
Project Proposal: lofi [ compression & encryption ] - http://
www.opensolaris.org/jive/click.jspa&messageID=26841. By leveraging
both the Availability Suite and the lofi OpenSolaris projects, it
would be highly probable to not only offer compression & encryption
to lofi devices (as already proposed), but by collectively
leveraging these two project, creating the means to support file
systems, databases and applications, across all block-based storage
devices.
Since Availability Suite has strong technical ties to storage,
please look for email discussion for this project at: <storage-
discuss at opensolaris dot org>
A complete set of Availability Suite administration guides can be
found at: http://docs.sun.com/app/docs?p=coll%2FAVS4.0
Project Lead:
Jim Dunham http://www.opensolaris.org/viewProfile.jspa?
username=jdunham
Availability Suite - New Solaris Storage Group
This message posted from opensolaris.org
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