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>> That sounds exactly like what I mean. Haven't heard of NetApp yet,
>> however. Do you know if the same could be done with DRBD or GFS
>> (Redhat/Fedora), or do those work differently?
GF> Significantly differently at the layer where the filesystem lives, yes.
GF> I looked into the option of using GFS recently for a specific job and
GF> decided that the convenience of ordering a pair of clustered
GF> "appliances" - whether NetApp, EMC, whoever - with the built-in failover
GF> and fault tolerance won out against building something from the ground
GF> up with GFS, even if the costs were higher in terms of capital layout.
GF> For me to do something with GFS would have required far more dev time
GF> (and therefore extra, "hidden" cost). Plus I have little SAN experience,
GF> and no SAN infrastructure for that job.
I can't advise real solve this problem, but may be this two links
will bw interesting.
http://www.coda.cs.cmu.edu/ -
Coda is a distributed filesystem with its origin in AFS2. It has many features
that are very desirable for network filesystems. Currently, Coda has several
features not found elsewhere.
- disconnected operation for mobile computing
- is freely available under a liberal license
- high performance through client side persistent caching
- server replication
- security model for authentication, encryption and access control
- continued operation during partial network failures in server network
- network bandwith adaptation
- good scalability
- well defined semantics of sharing, even in the presence of network failures
http://oss.oracle.com/projects/ocfs2/ -
OCFS2 is the next generation of the Oracle Cluster File System for Linux. It is
an
extent based, POSIX compliant file system. Unlike the previous release (OCFS),
OCFS2 is a general-purpose file system that can be used for shared Oracle home
installations making management of Oracle Real Application Cluster (RAC)
installations
even easier. Among the new features and benefits are:
- Node and architecture local files using Context Dependent Symbolic Links
(CDSL)
- Network based pluggable DLM
- Improved journaling / node recovery using the Linux Kernel "JBD" subsystem
- Improved performance of meta-data operations (space allocation, locking,
etc).
- Improved data caching / locking (for files such as oracle binaries,
libraries, etc)
Alex
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