[Beowulf] Sun buys Lustre
Peter St. John
peter.st.john at gmail.com
Wed Sep 12 12:26:59 PDT 2007
For those of us who are behind on filesystem terminology, I found "OST" =
"Objective Storage Target" at
Peter ("a TLA without a Wiki entry is Obscure")
On 9/12/07, Mark Hahn <hahn at mcmaster.ca> wrote:
> > I'm not sure if everyone has seen this yet, but Sun just bought Cluster
> > File System (Lustre):
> wow, that's a bit of a shock. I had heard mutterings about CFS using ZFS,
> but would not have guessed a buyout. where does that leave HP, for
> instance? or even SGI, who seem to now be promoting Lustre for their
> new blade clusters...
> the combination of ZFS and Luster is a bit strange to contemplate:
> - Lustre's main thing is to set up client-OST parallel streams
> and then get out of the way. it uses a single metadata server,
> which can be a bottleneck for non-giant-stream workloads, and
> which currently stores per-file ost-mapping info via EAs in an
> ext3 FS. OST'S don't need much functionality in their local FS,
> and use ext3 (with extents) as well.
> - ZFS's main thing is managing storage pools directly so as to
> provide intelligent file-level redundancy. and it has comfortingly
> high size limits and some nice integrity features. but afaik,
> no provisions at all for clustering or parallel access.
> I guess you could broadly compare CFS's OST's to ZFS's storage pools
> (sorry, don't know the ZFS terminology). but "clusterizing" the metadata
> logic of ZFS (parallelizing it and presumably distributing it across
> sounds kind of tricky.
> (I confess my only experience is with HP's SFS version of Luster, and none
> at all with ZFS.)
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