[linux-lvm] snapshots+highmem+'md raid5'
Herbert Poetzl
herbert at 13thfloor.at
Fri Jun 13 19:38:01 UTC 2003
On Fri, Jun 13, 2003 at 05:20:27PM -0700, Petro wrote:
> On Fri, Jun 13, 2003 at 01:55:01AM +0200, Herbert Poetzl wrote:
> > On Thu, Jun 12, 2003 at 03:28:59PM +0200, Koch, Steffen wrote:
> > > If someone has a solution for this please help.
> > hmm, do you have himem enabled (in kernel config)?
> > if yes, try to disable it ...
>
> Does this apply to RAID 0 as well?
>
> I've got several boxes running with:
>
> CONFIG_HIGHMEM4G=y
> # CONFIG_HIGHMEM64G is not set
> CONFIG_HIGHMEM=y
>
> And 2-4 GiB of ram under 2.4.18, with LVM 1.03.
>
> I'm trying to get LVM 1.07 to compile with 2.4.21 with :
>
> CONFIG_HIGHMEM4G=y
> # CONFIG_HIGHMEM64G is not set
> CONFIG_HIGHMEM=y
> CONFIG_HIGHIO=y
>
>
> Why is this bad?
didn't say that this would be bad, only that
it live-locked my system at high load ...
the tenor on the list was: "highmem is bad"
so I turned it off, and, voila the system was
stable again ...
another, yet unexplained issue, is that on
another system, 4 SCSI discs, form a RAID 5
array (software) which gives about 35MB
throughput, but lvm 1.0.7 ontop of that md
only has about 18MB throughput ...
YMMV,
Herbert
> --
> "On two occasions, I have been asked [by members of Parliament], 'Pray,
> Mr. Babbage, if you put into the machine wrong figures, will the right
> answers come out?' I am not able to rightly apprehend the kind of confusion
> of ideas that could provoke such a question." -- Charles Babbage
>
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