Matthew Dillon wrote: > [about FreeBSD's gjournal] > It's kinda similar to DragonFly's VFS journaling... I built it but > as far as I know only one or two people actually use it in production, > and I'm not one of them. The use cases are very limited.
Some time ago I played a bit with DF's journaling inside a qemu instance, because I was curious how it works. But I didn't do anything serious with it. At the beginning I was a little confused about the various terms used by DragonFly. The main purpose of what DF calls "journaling" seems to be replication, which is different from what other operating systems call journaling. On the other hand, the "mirroring" feature in HAMMER is not really a RAID-1 (which is what people usually mean when they talk about a mirror in the context of storage). It is rather a replication mechanism, too, not completely unlike DF's VFS journaling. So, in other words, DragonFly now supports two different FS replication features, one of them is called journaling and the other is called mirroring, while it is neither really the one or the other. :-) (Please don't take this as criticism. I'm just trying to explain my confusion.) Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd
