[openbeos] Re: sync daemon?
- From: "Waldemar Kornewald" <wkornewald@xxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Thu, 18 Jan 2007 19:42:28 +0100
Hi,
On 1/18/07, André Braga <meianoite@xxxxxxxxx> wrote:
So we're left with some options. Not to cache writes and force them to
happen synchronously and kiss goodbye every hope for performance
(eek); to cache writes, sync them from time to time and give the final
syncing job to the unmount operation (more reasonable and every OS is
doing that nowadays); or the perhaps best option which I'm yet to find
implemented in ANY operating system:
Well, you could at least make it possible to specify volumes that
should still have a write cache (this is possible in XP, too), so your
always-connected USB HDD will always work at maximum speed.
To put a pseudo full journal (not only metadata) on top of every
removable media and warn the user if there were any uncommited write
jobs the moment he ejected the media, asking him to kindly reinsert it
and wait for the progress meter on the dialog to complete before
removing it again. It would have to be FS independent, like the
gjournal GEOM layer being developed for FreeBSD 7. But we don't really
need that level of sophistication to implement this idea; a relatively
easy implementation is to just log all the write operations and them
flush as appropriate, or maybe layering a sparse image on top of the
removable media FS and commit the changes as appropriate; the latter
happens to be very similar to how VMWare and QEMU 0.8.2 handle
snapshots.
This is a nice idea to prevent data loss. We also have to make it very
easy to unmount your volumes, though. Placing the volume icons on the
desktop is IMHO accessible enough. Maybe Deskbar is the right place
for volumes?
Bye,
Waldemar Kornewald
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