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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 11:19:20 +0200
- Cc: openldap-technical <openldap-technical@openldap.org>
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- In-reply-to: <4CBD6034.4000906@esiee.fr>
- References: <4CBD596F.2010204@esiee.fr> <AANLkTi=kSzGp-odQ7yEN3UEKqZ62yzH34h6KxF0LQO8s@mail.gmail.com> <4CBD6034.4000906@esiee.fr>
Hello,
I havn't set up any SSD-based OpenLDAP installations, in most cases I
use Storage LUNs for that, but I don't know/care what kind of disk
giving me the space. Sorry. :)
If you think of syncrepl, do you imply installing two openldap servers
on one local machine?
You should setup this construct. :)
Bye.
On Tue, Oct 19, 2010 at 11:09, Frank Bonnet <f.bonnet@esiee.fr> wrote:
>
> Perhaps running syncrpl between ramdisk and hardisk ?
>
>
>
> On 10/19/2010 11:00 AM, Benjamin Griese wrote:
>
> 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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