Solved [SOLVED] How to use dump(8) on journaled slices?

[Chris_H]

Gah!
I installed releng_9 (9.2-STABLE) thinking journaled soft updates would be a faster ffs. But now that I have everything exactly the way I need it, to make a dump(8), so as to use for rollouts. I'm told journaled ffs isn't supported! Have I just wasted a boat load of time? Can I UNjournal it, without hosing the installation? Is there any hope at all?
Please help. I'm afraid I've just made a horrible mistake.

Thank you for all your time, and consideration.

--Chris

 

[wblock@]

Re: How to use dump(8) on journaled slices?

A slice is a partitioning thing, nothing to do with the filesystem.

Are you talking about soft updates journaling (SUJ)? Yes, that prevents dump(8) from running. Some of us have had problems with it, and I personally don't use it for anything. All it does is make fsck(8) faster... but some say it happens more often, too.

Yes, it can be disabled with tunefs -j disable [i]filesystem[/i].

 

[Chris_H]

Re: How to use dump(8) on journaled slices?

A slice is a partitioning thing, nothing to do with the filesystem.

Are you talking about soft updates journaling (SUJ)? Yes, that prevents dump(8) from running. Some of us have had problems with it, and I personally don't use it for anything. All it does is make fsck(8) faster... but some say it happens more often, too.

Yes, it can be disabled with tunefs -j disable [i]filesystem[/i].

@wblock@, you're my hero! You saved my bacon again. I owe you, big time.
Thanks a million!

--Chris

 

[SirDice]

Re: How to use dump(8) on journaled slices?

I installed releng_9 (9.2-STABLE) thinking journaled soft updates would be a faster ffs.

Journaling won't make the filesystem any faster with normal operations, it may even be a little slower because it needs to update the journal too. However, an fsck(8) will be faster. Especially with large disks this difference can be quite dramatic.

 

[Chris_H]

Re: How to use dump(8) on journaled slices?

@SirDice, thank you very much for the reply.
Good to know. I see @wblock@ hinted at that as well. I used this box to evaluate releng_9. If things seemed to pan out. I was going to use it to produce images (dumps, really) to roll out up(dates|grades) to many of my production boxes. Since the production boxes never have less than 100+ days uptime()(1), and rarely require fsck()(8). Journaling will clearly be pointless.

Thanks again, @SirDice, for taking the time to reply.

--Chris

 

[Chris_H]

Re: How to use dump(8) on journaled slices?

I might as well mark this [SOLVED]. But should it not be obvious to others;
In order to use tunefs() for this sort of endevour, you will need to drop to single-user first -- ^D, or bounce the box, and select SingleUser from the boot menu.

Best wishes.

--Chris