harddisk sizing
Hello, how can I make use of a 18GB disk with SCO unix 5.0.5 and Informix 7.30.UC2? AFAIK Informix chunks can be up to 2 GB, and SCO can have up to 7 partitions per disk That sums up to 14 GB! Actually our problem is, we are using RAID and have a logical drive of 105 GB! How do I split them? Kai
Kai_Shen@acer.de wrote: > > Hello, > > how can I make use of a 18GB disk with SCO unix 5.0.5 and Informix > 7.30.UC2? > AFAIK Informix chunks can be up to 2 GB, and SCO can have up to 7 > partitions per disk > That sums up to 14 GB! > > Actually our problem is, we are using RAID and have a logical drive of 105 > GB! How do I split them? You need to get a Volume Manager that can create more than 7 logical or virtual drives from your array. Veritas VM is a good one, there are others. SCO may even have one of their own they will be happy to sell you. Art S. Kagel
On Mon, 26 Apr 1999 17:16:13 +0100, Kai_Shen@acer.de wrote: > > > >Hello, > >how can I make use of a 18GB disk with SCO unix 5.0.5 and Informix >7.30.UC2? >AFAIK Informix chunks can be up to 2 GB, and SCO can have up to 7 >partitions per disk >That sums up to 14 GB! > >Actually our problem is, we are using RAID and have a logical drive of 105 >GB! How do I split them? > >Kai > I have a similiar problem with SCO 505 and a PERC/AMI Mega Raid Controller. I broke the Raid (90 gig total) into logical drives (5) to allow for more Informix partitions (2 gig each) on SCO. It works great, but the Raid had major issues when one of my 18 gig drives went down. I had a hot spare configured, but the controller would not rebuild the drive once it was replaced. Calling DELL (It was in a 6300 server) they were aware of issues with this controller and logical drives. They recommended getting rid of the logicals. I would love to know if it's really necessary to create these DB chunks. How much of a performance hit would one take if using a Unix file system. Gary
See below... Kai_Shen@acer.de wrote: > Hello, > > how can I make use of a 18GB disk with SCO unix 5.0.5 and Informix > 7.30.UC2? > AFAIK Informix chunks can be up to 2 GB, and SCO can have up to 7 > partitions per disk > That sums up to 14 GB! > > Actually our problem is, we are using RAID and have a logical drive of 105 > GB! How do I split them? > This is your problem -- I always split my Raid drives up for operating system and database specific chunks to avoid that problem -- and short of re-building the RAID set (we use a Mylex controller on a Digital Prioris 6200 MP system for SCO), I am not quite aware a way out -- I'd check the IDS documentation to see if I see a capability beyond 2GB ( I thought that was a feature of IDS over Online). (note -- rest of this concerns Digital UNIX which I use instead of sco for these reasons:) Under Digital UNIX, I am slow to commit the "available raw disk partitions" from the RAID devices (/dev/rreNN?) until I need them. An alternative way under Digital UNIX is to use Logical Storage Manager which will break the raw 105GB logical drive into operating system and database usable chunks. > > Kai
Gary Quiring wrote: > > On Mon, 26 Apr 1999 17:16:13 +0100, Kai_Shen@acer.de wrote: > > > > > > > > >Hello, > > > >how can I make use of a 18GB disk with SCO unix 5.0.5 and Informix > >7.30.UC2? > >AFAIK Informix chunks can be up to 2 GB, and SCO can have up to 7 > >partitions per disk > >That sums up to 14 GB! > > > >Actually our problem is, we are using RAID and have a logical drive of 105 > >GB! How do I split them? > > > >Kai > > > I have a similiar problem with SCO 505 and a PERC/AMI Mega Raid > Controller. I broke the Raid (90 gig total) into logical drives (5) > to allow for more Informix partitions (2 gig each) on SCO. > > It works great, but the Raid had major issues when one of my 18 gig > drives went down. I had a hot spare configured, but the controller > would not rebuild the drive once it was replaced. Calling DELL (It > was in a 6300 server) they were aware of issues with this controller > and logical drives. They recommended getting rid of the logicals. > > I would love to know if it's really necessary to create these DB > chunks. How much of a performance hit would one take if using a Unix > file system. The performance hit of using the Cooked logical device over the RAW logical device is about 10-15%. If you use a filesystem file instead you can add another 5-10% for filesystem overhead. If you are having problems with your RAID controllers then check out the ICP Vortex RAID controllers (www.icp-vortex.com). They have a good reputation in Europe and are just starting to appear here (Penguin Computers configures Linux systems with them). They implement RAID 0, 1, 4, 5, and RAID 10 (my favorite for those who don't already know) with two different versions (a RAID 1 card that also supports RAID 0 and a RAID 5 card that also all of the above) with from 1 to 5 channels. ICP says they support all major OS versions with drivers, I'd imaging SCO would be among those. Art S. Kagel