chunks and raw filesystems
A user asked what size to specify when adding a chunk so a 2 GB raw partition is fully used. The answer: onspaces takes KB, not pages (e.g. onspaces -a dbspace -p /dev/raw -o 0 -s <size in KB>), and onmonitor shows KB in 9.30 though the poster's Informix 7 onmonitor shows pages. Others corrected the 2 GB figure from 2048000 to about 2097150 KB, noting that if you specify too large a value the engine reports the real maximum, and you may need to round down a few KB to a multiple of the page size.
Auto-generated by DrWatson from the posts below — may be imperfect; read the full thread.
I've been adding chunks to Informix using the incorrect size to fully use a disk partition. I am going to start using the correct size now (and correct the old ones at a later date). Now I have 2Gb raw disk partitions. If I want to add an additional chunk to a dbspace do I set the block size as 1024000 to fully use the filesystem? Hope someone can help.
On Wed, 19 Nov 2003 14:55:42 +0000, Geezer From The Freezer
<Geezer@Freezer.com> wrote:
>I've been adding chunks to Informix using the incorrect size
>to fully use a disk partition. I am going to start using the
>correct size now (and correct the old ones at a later date).
>
>Now I have 2Gb raw disk partitions. If I want to add an additional
>chunk to a dbspace do I set the block size as 1024000 to fully use
>the filesystem?
>
If I understand you correctly.......8-)
In order to use the full 2G rawspace as a chunk for a dbspace, you
would use something like . . .
onspaces -a (some dbspace_name) -p (path to raw disk
partition) -o 0 -s 2048000
This would add a 2G chunk to a dbspace. Remember, onspaces uses K,
not pages.
HTH
JWC
John Carlson wrote:
> This would add a 2G chunk to a dbspace. Remember, onspaces uses K,
> not pages.
John - what about onmonitor?
On Wed, 19 Nov 2003 15:42:15 +0000, Geezer From The Freezer
<Geezer@Freezer.com> wrote:
>
>
>John Carlson wrote:
>
>> This would add a 2G chunk to a dbspace. Remember, onspaces uses K,
>> not pages.
>
>
>John - what about onmonitor?
Ooooooh, good point . . . . I haven't used onmonitor in ages....
According to the onmonitor screen I see in 9.30, it shows KB for
offset and size.
John Carlson wrote: > > On Wed, 19 Nov 2003 15:42:15 +0000, Geezer From The Freezer > <Geezer@Freezer.com> wrote: > >John - what about onmonitor? > > Ooooooh, good point . . . . I haven't used onmonitor in ages.... > > According to the onmonitor screen I see in 9.30, it shows KB for > offset and size. hmm mine shows "Pages in chunk" then again I'm on informix 7
"John Carlson" <john_carlson@whsmithusa.com> wrote in message
news:082nrvofm8f0ibnkfi9gkb2ml0584ephga@4ax.com...
> On Wed, 19 Nov 2003 14:55:42 +0000, Geezer From The Freezer
> <Geezer@Freezer.com> wrote:
>
> >I've been adding chunks to Informix using the incorrect size
> >to fully use a disk partition.
> In order to use the full 2G rawspace as a chunk for a dbspace, you
> would use something like . . .
> onspaces -a (some dbspace_name) -p (path to raw disk
> partition) -o 0 -s 2048000
2097150 in fact.
> In order to use the full 2G rawspace as a chunk for a dbspace, you
> would use something like . . .
> onspaces -a (some dbspace_name) -p (path to raw disk
> partition) -o 0 -s 2048000>
> This would add a 2G chunk to a dbspace.
It would add somewhat less than 2GB. The full size is (from memory)
2097150K.
If you try too big a number it'll tell you the actual maximum. You'll
probably have to deduct 1 - 3k to make the figure it tells you a
multiple of page size.
Andy