On 2010-03-24 08:05, Stefan Seifert wrote:
On Tuesday 23 March 2010 22:57:39 Christian Iversen wrote:
Well, there's that. But the *primary* can't change anything either! Data
would change while the filesystem expects it not to. Even if you somehow
disable all caching (which you can't do without changing the kernel),
you would STILL get serious data corruption errors, because of the many
possible race conditions.
It's not wise, but it's not impossible, either.
It is impossible, though. Unless NEITHER node ever change the data. And
in that case, you might as well just copy it out once and for all.
If one really wants to read on the secondary there's an easy way: put DRBD on
top of LVM and create a snapshot and mount that ro. Works just as one would
expect including the absolutely obvious side effects of working with a
snapshot like having to recreate it to get updated data. And even the sysadmin
two generations from now will immediately understand this.
Are you sure that LVM can create the snapshot without updating the
metadata on the device? Because that's not allowed.
--
Med venlig hilsen
Christian Iversen
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