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From: Andreas Kostyrka (andreas_at_mtg.co.at)
Date: Thu 31 Oct 2002 - 07:18:01 GMT

Am Mit, 2002-10-30 um 22.52 schrieb Mefford, Aaron:
> I realize that I am new to the list and do not have much history, but I am
> considering the possibility of using vserver on a fairly large project and
> as such would like to at least take a moment to offer my opinion on a couple
> of items.
> First, I almost walked away from using the vserver option until after
> joining the list I saw that the quota issue was being actively addressed.
> Of the todo's left, quota was the biggest gap for my application. It would
> be excellent to see the others addressed but without quota it would not be
> an option.
It surely should be. Consider using LVM and sticking each vserver on
it's own logical volume. This way you can statically allocate space to
vservers and resize their needs online.
> As to the specific post, I am not sure that the hard line of not overbooking
> is a good idea. While for many applications it would be a correct solution
> there are some where it will not. Every ISP over allocates their available
> resources. People do not care to pay for dedicated resources.
> Additionally, with most services now being offered via resellers, it seems
> unreasonable to not allow the reseller the same option. For instance, if I
> sell virtual private servers, and joe buys a VPS with the intention of
> selling individual web sites run within the VPS, I may or may not want to
> allow Joe to oversubscribe his disk s pace, possibly even on a per VPS basis.
Thats what "soft" quotas are fore. Depending upon your guidelines when
someone oversteps the softquota, either the root_at_main or root_at_vserver
should decide if an upgrade of discstorage is needed and initiate it.

Basically if you get 500MB/1000MB hard, you can overbook in the same
ratio your own users, ...

> I realize that implementing a solution that would support a hybrid approach
> raises the complexity, but I wanted to state that there is value and need
> for such an approach.
Well, the quota approach do have some problems (IMHO). Consider the
vunified system files. Do they count against the "main" root quota, or
against the "user" root quota? How is the Security Context a file
belongs to stored on disc?


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