Re: [ossig] real time linux server mirroring

[cdemarco@xxxxxxxxxxx]

On Fri, Nov 05, 2004 at 09:52:47PM +0800, Maulvi Bakar wrote:

> around to, but  definitely in the near future  :-P .  If you did try
> it out, please tell us  all about it here!    We (which means I  ;-)
> want all the sordid details!

It works, it's great,  it's DANGEROUS.  If  you stop thinking about it
even for a second  you can make  HORRIBLE TERRIBLE MISTAKES  that turn
your precious  data into    swiss  cheese -    or worse  (like  stinky
gorganzola, or perhaps even <shudder> Chesdale!).  I would consider it
production-ready, but not idiot-proof.  So webservers and the like, go
right  ahead   (but   take  your  backups!).    Banks  or fire-control
systems... better wait.

I used it  on a dedicated 100Mbps network  and was quite pleased  with
the results.  Be sure you test any failover VERY carefully though, and
docuement  the hell  outta  your procedures for  failing over, failing
back, recovery, shutdowns, startups, etc. etc. etc.

The catch to DRBD is that it's not hot-hot yet (or  at least it wasn't
last year, it  might be now).  So you  have to  make pretty damn  sure
that  the  "cold"  partner is   NEVER   going to write  to   the  DRBD
filesystem.  That  alone  would probably  make it unsuitable  for your
example of /etc and /var.  

But warts   and  bumps   aside,  it's  fsckin' cool   technology  (pun
intended).


-- 
% You are in a maze of twisty passages, all alike.
Christopher DeMarco <cdemarco@fastmail.fm>          
PGP public key ID 0x2E76CF5C @ pgp.mit.edu
+6012 232 2106


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