> As far as crashes and dataloss, the default setup is generally pretty > stable, however during sustained heavy writes you can have data > loss/corrupt partitions with the defaults, if power is cut or there is a > crash. It's not likely, but readily reproducible under the right > conditions. > > Now, there are caveats to this. OpenBSD partitions appear to be pretty > crash safe if using sync, and *not* using RAID 1. It's possible that > crypto, RAID 5, etc, are also impacted, but I can only speak for > OpenBSD's RAID 1 implementation.
I think this is mostly due to softraid is stacking devices on top of each other, so that writes can exist in several layers before actually hitting disks, so the chance is larger that any delay causes more issues in the bottom layer (the actual disk) when the crash happens. If you stack vnd images in filesystems in vnds in filesystems I gather you would get the same problem, even if the machine tries to flush the top layer it may not reach the bottom layer until the stop is in effect and hence "worse" failures. As others have said, backups are really good protections against most kinds of sad surprises, regardless of where they come from. 5/5 - would recommend. -- May the most significant bit of your life be positive.
