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Hi everyone,
I'm setting up a HA-VS cluster and still need to choose a LAN-mirroring
option. Perhaps, one of you would help with experience ...
The perfect solution would allow me :
- 3 point mirror (3 partitions)
- Mounting the fs r/w on 3 to 5 clients at a time with file lock handling (to
avoid data corruption).
- Automatic/Transparent fail-over (like coda does with its cache feature)
- Reliability (will handle all of my company's technical and administrative
data, e-mails, web servers, ... !!)
Yes, I know, I'm looking for the perfect solution ... Here are the one I
found and some thougths about them. If some of you can help me finding the
good one.
- DRDB :
sounds good. In fact, seems to be the easier and more reliable
option.
But, the fs can only be mounted on one machine at a time and it only
supports one mirror.
- CODA :
would be helpful for those distant workers with its cache feature !
But there is a need to install a client on each computer that would
access the fs. Sharing through SAMBA is not easy because of the CODA login
feature ! And last but not least, the unability to handle file locking in
connected operation mode (meaning the same file can be modified by two
clients at the same time : data corruption !).
- NBD :
sounds buggy and badly documented ... Seems not to be reliable when
running a client and a server on the same computer.
Without these two points, I would have gone to this one as it best
approaches my needs (ability to create md devices on top of nbd devices).
- GFS :
Based on expensive hardware ...
I really like DRDB and CODA. DRDB seems easy to set up. It does not feet my
needs, it means having the same service running on only one computer (or
share the fs with NFS from that computer, but it would generate a heavy
network load).
CODA has some really interesting features, but it uses its own
login/passwd/file access rights and this will not be easy to use on our
stations ...
Here I am, waiting for your comments.
Thanks to all ;-)
Sylvain Coutant.
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