[wplug] Re: MD on atop of LVM (or LVM2's native RAID), instead
of LVM on top of MD -- WAS: Install Question
Bryan J. Smith
b.j.smith at ieee.org
Wed Jul 25 17:09:59 EDT 2007
On Wed, 2007-07-25 at 16:38 -0400, Drew from Zhrodague wrote:
> I have just the opposite experience, which has me choose to use
> one big / partition.
BTW, don't take offense to anything I say, I'm a fully self-aware SOB.
We all have our own experiences.
But this does remain ...
> Whoa! Whoa! Whoa!
> Q: What is the purpose of meta-data journaling?
> A: _Mitigate_ the time it takes to put the filesystem into a
> "clean" state.
> I stress the word "mitigate." Why?
> Q: Which is _better_ for ensuring a filesystem is consistent?
> 1. Full fsck
> 2. Full data journaling
> 3. Meta data journaling
> A: 1, period -- journaling does _not_ guarantee consistency
> Almost as good: 2, with NVRAM as your full data journaling
> Journaling is _only_ "mitigating" the risk of an inconsistent
> filesystem. _Only_ a full fsck _guarantees_ it. ;)
Full fsck's _always_ guarantee filesystem consistency.
Journaling does _not_. ;)
--
Bryan J. Smith Professional, Technical Annoyance
mailto:b.j.smith at ieee.org http://thebs413.blogspot.com
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