[Linux-cluster] storage clustering without SAN

[Rainer Duffner]

Am 21.03.2007 um 23:02 schrieb Sridhar Ramaswamy (srramasw):

>
> Don't we have a potential solution using GNBD and CLVMD?
>
> So you've bunch of PCs with hard disks.
>
> 1) Each PC create LVM PhysicalVolume (pvcreate) on its storage device
> 2) Each PC exports the physical device using GNBD non-cached
> 3) Each PC imports other PCs storage using GNBD
> 4) Create a VolumeGroup combining GNBD devices (like
> /dev/gnbd/gnbd_pc01) and local physical devices (/dev/hda8). CLVMD  
> will
> take care of distributing LVM info among cluster nodes.
> 5) Create GFS on top of an logical-volume created off this above
> VolumeGroup
>
> Would such a thing work alteast as described above? Such a setup will
> aggregate storage off these PCs into a single volume.
>
> Ofcourse, even if it does "work", it is a different question  
> whether it
> make sense to deploy such a solution. Major downside is - even if  
> one PC
> shuts down, the whole VolumeGroup would be offline and GFS won't be
> available. Fencing doesn't apply here.
>
>

;--)
Usually, "distributed" still implies some sort of redundancy.
Unless you're Google and your data consists of copies of downloaded  
webpages, losing some of your data is not an option.



Rainer