Re: Directors and Realservers - Do they need RAID?

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Directors and Realservers - Do they need RAID?
From: Gavin Henry <ghenry@xxxxxxxxxxxxxxxxxx>
Date: Sat, 30 Jul 2005 23:40:30 +0100
On Saturday 30 Jul 2005 22:49, Scott J. Henson wrote:
> Gavin Henry wrote:
> >Dear list,
> >
> >Just spec'ing some machines, as we need two Directors and two Realservers.
> >
> >I had planned on using Dell 1850 with 1GB RAM and Dual Xeon 3.GHz for the
> >DIrectors, but they don't do RAID.
> >
> >Would that be needed?
> >
> >Also, for the two realservers doing PHP and Apache, I had planned on using
> >Dell 2850 2GB RAM and Dual 3Ghz RAID 5/10
> >
> >fs RAID is advised on the DIrectors, then 2850's all round are needed.
> That depends.  If your using your directors in fail over mode, then raid
> really is over kill.  Especially if your not having any data on the
> directors(which I would assume your not).  Also raid might be over kill
> on the Realservers as well.  If both will be serving the same data and
> you will be keeping them in sync, then you may not need raid there
> either.  It just depends on how safe you want your data to be and how
> highly available you want to be.  A raid on each of the 4 mirroring the
> OS drives could ensure that none ever go down except for scheduled
> maintanence.
> Its really a question of how much money do you have to spend and how
> important is being available to you.  But I belive raid is over kill if
> your using LVS.  Note, at my site, we only use raid on our file servers
> and db servers.  Where there is data we want to keep.  Everything else
> is cheap hardware and then we use LVS to provide high availablity.

As I thought.

We will have SystemImager image for the directors and realservers anyway, so 
if they die, it's just a new disk and reboot.

Thanks for the advice.

Kind Regards,

Gavin Henry.
Managing Director.

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