Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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