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Re: db stick in RAM ?
- To: Frank Bonnet <f.bonnet@esiee.fr>
- Subject: Re: db stick in RAM ?
- From: Benjamin Griese <der.darude@gmail.com>
- Date: Tue, 19 Oct 2010 11:00:22 +0200
- Cc: openldap-technical <openldap-technical@openldap.org>
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Hi Frank,
by rsync to hdd, do you mean copying the db files or slapcat the
output to a file?
The first one seems to be a db killer if the db is in use while copying it. :)
I think the only safe way is by doing a slapcat after every write to
the db (accesslog?).
Anyway, sounds like a nice idea to me to get a big performance boost.
Have you considered SSDs instead of ramdisks?
Imo its the more safe and nearly as fast as ramdisk alternative. :)
Bye, Benjamin.
On Tue, Oct 19, 2010 at 10:40, Frank Bonnet <f.bonnet@esiee.fr> wrote:
>
> Hello
>
> I'm thinking to put db files in RAM instead of hard disk
> for performance reasons.
>
> FreeBSD ( and Linux thought ) provide some utility to build
> RAMDISK ( md )
>
> I did some tests in rebuilding db files with the slapcat/slapadd
> commands
>
> with RAMDISK
>
> ldap3# time slapadd -l test.ldif
> /usr/local/etc/openldap/slapd.conf: line 110: rootdn is always granted
> unlimited privileges.
> #################### 100.00% eta none elapsed 20s spd 633.9
> k/s
>
> WITH HARDDISK
>
> ldap3# time slapadd -l test.ldif
> /usr/local/etc/openldap/slapd.conf: line 110: rootdn is always granted
> unlimited privileges.
> #################### 100.00% eta none elapsed 04m22s spd 48.4
> k/s
>
> Does anyone runs production servers with ramdisk ?
>
> I know it is risky but running rsyncd between ramdisk and a hardisk depot
> would be safe huh ?
>
> Thanks for any advices
>
>
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