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Home > Archive > ASE Database forum > October 2005 > solaris ramdisk and tempdbs
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solaris ramdisk and tempdbs
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| Jesus M. Salvo Jr. 2005-10-27, 8:21 am |
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Solaris9 SPARC.
Is there any difference, performance wise, between using:
1) tempdbs on tmpfs
2) tempdbs on ufs on ramdisk
3) tempdbs on raw on ramdisk
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| Jesus M. Salvo Jr. wrote:
> Solaris9 SPARC.
>
> Is there any difference, performance wise, between using:
>
> 1) tempdbs on tmpfs
> 2) tempdbs on ufs on ramdisk
> 3) tempdbs on raw on ramdisk
>
>
a filesystem with fs-type "tmpfs" will use solaris virtual memory.
This is your physical memory + your swap space.
if you place tempdb on a raw device or (Veritas) Volume,
then the Solaris kernel / IO system will do an optimal I/O chaching for you.
using a tmpfs-filesystem does not bring a real benefit.
there is on ufs on a tmpfs-filesystem.
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| Jesus M. Salvo Jr. 2005-10-27, 8:21 am |
| Opera wrote:
> Jesus M. Salvo Jr. wrote:
> a filesystem with fs-type "tmpfs" will use solaris virtual memory.
> This is your physical memory + your swap space.
>
> if you place tempdb on a raw device or (Veritas) Volume,
> then the Solaris kernel / IO system will do an optimal I/O chaching for
> you.
>
> using a tmpfs-filesystem does not bring a real benefit.
> there is on ufs on a tmpfs-filesystem.
So I presume no-one has use tempdbs on a raw device on ramdisk ??
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