Date: Tue, 23 Jan 2007 08:58:27 -0600 From: Eric Anderson <anderson@freebsd.org> To: Oliver Fromme <olli@lurza.secnetix.de> Cc: vd@freebsd.org, silby@silby.com, xride@x12.dk, freebsd-geom@freebsd.org Subject: Re: Where to start? Message-ID: <45B62293.9020907@freebsd.org> In-Reply-To: <200701231435.l0NEZ7W4049331@lurza.secnetix.de> References: <200701231435.l0NEZ7W4049331@lurza.secnetix.de>
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On 01/23/07 08:35, Oliver Fromme wrote: > Eric Anderson wrote: > > Oliver Fromme wrote: > > > Vasil Dimov wrote: > > > > This thing still looks to me like roping your chest to your leg (instead > > > > of to an unmovable object) in order to avoid falling, but I might be > > > > wrong... > > > > > > True, it's certainly not a clean nor efficient solution. > > > But Mike has a valid point that it would enable people to > > > turn on journaling on existing file systems, without the > > > need for repartitioning or adding a disk. It would be a > > > nice way to _quickly_ set up journaling, for testing > > > purposes, or simply for curiosity. > > > > Why not disable swap, use the swap partition as the new journaling > > device, and then enable vn-backed swap for the system? > > Nice idea. Indeed, that would probably work, if the swap > is large enough to hold the journal. > > By the way, what happens if you put a swap file on a > journaled file system? Will the page-out actions also > be journaled? Yep. gjournal has no way to know (right now) that it is journaling a swap file, etc. It's just a block device journal, so anything that hits the disk, goes through the journal. I'm not sure how this impacts performance, if it does at all. > > > BTW, I think in Solaris you can also add journaling to an > > > existing UFS partition on the fly, without the need for > > > newfs or adding space. (Provided that there is enough > > > free space inside the existing file system, of course.) > > > > Sure - many journaling fs have that ability. There's been several > > attempts in the past to add journaling to our UFS2, without completion. > > Yes, I know. But now there is PJD's gjournal. :-) > > Best regards > Oliver > Eric
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