Re: Sharing disks across machines

What is the use of having the disk accessible to the both boxes? We currently have systems with Shared Disk running Informix on Solaris. We use Legato AAM to handle Application Clustering. This is used in case of a failure of the Sun hardware. This will allow the disk to be attached to the second server and the database to be brought on-line. The Disk is setup in a RAID 5 +1 to lower the chance of Disk failure. We also have systems using HDR and these are separated to different locations to prevent lose of access due to a site being lost. These do not have as much disk redundancy. The IDS engine cannot write to the shared disk when another system is using. So only one instance can be running on a given set of disk. With this in mind HDR should be setup where each has its own disks. Using links you can setup the disks with no issues and have the disk mount on both systems but you would still need to have separate disk for each system. I would suggest if they are going to use HDR they not even think about using Shared Disk. Just setup a private network for the HDR instance to talk on. It can be a direct cable or switched network depending on distance. Either way I would suggest having the network setup as its own private domain. Sorry to the point... I wouldn't say "mad" but I would ask for someone what they expect to gain in that configuration? On Wed, 2004-04-07 at 07:50, Andy Kent wrote: > Client has presented me with an, erm, interesting proposal for an HDR > pair: each machine's disks accessible to the other box, all RAID 1+0 > but with the mirrors on the opposite box. > > Clever and ingenious or barking mad? I can't decide and would welcome > any comments. > > Also would it actually physically work? Would IDS be able to see the > remote disks? > > We're talking 9.40 on new Sun kit. > > REAL, LIVE email reply address. > > Andy Kent > Bristol, UK > sending to informix-list sending to informix-list sending to informix-list sending to informix-list