From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Cole Subject: Re: Object Oriented FS Date: Mon, 27 Oct 2003 18:40:53 -0700 Message-ID: <200310271840.53732.elenstev@mesatop.com> References: <200310271604.h9RG4D3h008698@eastgate.starhub.net.sg> <3F9D629A.6050508@namesys.com> <20031027115622.A17778@schatzie.adilger.int> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <20031027115622.A17778@schatzie.adilger.int> Content-Disposition: inline List-Id: Content-Type: text/plain; charset="us-ascii" To: Andreas Dilger , Hans Reiser Cc: darren , reiserfs-list@namesys.com On Monday 27 October 2003 11:56 am, Andreas Dilger wrote: > On Oct 27, 2003 21:23 +0300, Hans Reiser wrote: > > darren wrote: > > > allows very high throughput by scaling > > > > Do you know what that means? (Seriously, I don't....) > > Panasas (from what little I have seen of it) looks to be very similar to > Lustre. Clients do not access disks directly, but rather have a mapping > layer between offsets and actual data on disk (similar to LVM and VM > abstractions of block devices/memory). Once client has this mapping (very > small in lustre, on the order of a few hundred bytes at most), it > can do IO directly to one or more storage devices hence scaling of > throughput proportional to number of storage targets. > > In Lustre at least, the client knows nothing about the physical layout of > blocks in the file on disk, but rather just accesses one or more objects > via object identifyer, offset, length so the actual layout of the on disk > data can change. > > Lustre is GPL, don't know about Panasas. > > Cheers, Andreas Reading the following, it appears that something _should_ be GPL... =46rom http://www.panasas.com/object_storage_arch.html "Panasas is committed to drive the development of standards for the=20 object-based storage. Through the ANSI T10 committee, Panasas is working wi= th=20 industry leaders including EMC, IBM, Intel, and Seagate to ensure that=20 open-source, reference implementations of object-based storage designs are= =20 available and driven through an open standards process." =46rom http://www.panasas.com/directflow.html "For the operating system on client server nodes to directly read and write= =20 data objects, an installable file system must be deployed. The DirectFLOW=20 client installs as a local file system under Linux and is transparent to th= e=20 operating system and applications above it. This installable file system=20 manages the striping of data objects across StorageBlades on a per-object=20 basis, and unlike standard RAID arrays, has the ability to optimize data=20 layout and RAID level by each object. DirectFLOW thereby enables=20 high-performance simultaneous data access for large numbers of clients to=20 many files." The fairly large .pdf files available for download seem to be short (2-page= ),=20 prettied-up versions of the information available at the above URLs. Steven