Re: Informix Mirroring

>> If I'm understanding you, Art, you may be suggesting that DiskSuite >> mirroring might be preferred over Informix mirroring, but Veritas might be >> preferred over DiskSuite. I don't want to put words in your mouth, this is >> just a perception check. > >Ummm. I'd class Disksuite and Veritas at the same level, though I suspect >that Veritas is a better product. Both are addons not OS level drivers. >What I am saying is that on, say Linux, with kernel OS mirroring I'd >expect that the OS mirror would outperform Veritas, if and when it becomes >available for Linux (maybe it already is?). They are very similar but the functionality of Veritas is superior. Veritas is aimed more at the enterprise where Disksuite is more workgroup. Performance wise both products have their supporters, on smaller systems DiskSuite has the edge (apparently according to the Sun performance guys). The other main advantage of DiskSuite especially for home use is it's free:-)) I suppose that Sun would claim they don't need OS drivers, cos you can use the hardware within the RAID units do most of what you need. I've been told, but never seen figures to support it, that if you stripe within the RAID arrays at a hardware level and stripe across the arrays using Veritas then performance is staggering ie the disks are double striped. The disadvantage, there is always one isn't there:-), is to add a new disk or series of disks the striping has to be unpicked and redone. Paul Watson WF Software Ltd Tel: +44 1436 674729 Fax: +44 1436 678729 www.wfsoftware.com/informix # If you broke it, hide the evidence ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************

I posted the following on a different thread, but here it is again. ======== I favor the hardware RAID over DiskSuite or Veritas (okay for managing filesystem growth, but too slow for RAID 5, 10). MTI has a hardware RAID solution which working fine for one of my customers running Oracle. Informix shouldn't care with what's going on at the disk level. It sees the volume (RAID 10 or whatever) as a single volume. The hardware RAID performs all of the striping and mirroring, which can put overhead on the OS if RAID is configured in software (DiskSuite or Veritas). Look at a hardware solution like having a dedicated processor for disk I/O. MoJo Risin ========= IMO, Veritas MAY be able to perform RAID, but should only be used as a last resort. Filesystem management is it's true calling, and that's where it should be used. RAID 10 (or 0+1) is the best for database applications. Efficient for reads and writes. MoJo Risin -- In article <7vbqcg$4qm$1@news.xmission.com>, "Paul watson" <watsop@russellcorp.co.uk> wrote: > > >> If I'm understanding you, Art, you may be suggesting that DiskSuite > >> mirroring might be preferred over Informix mirroring, but Veritas might be > >> preferred over DiskSuite. I don't want to put words in your mouth, this is > >> just a perception check. > > > >Ummm. I'd class Disksuite and Veritas at the same level, though I suspect > >that Veritas is a better product. Both are addons not OS level drivers. > >What I am saying is that on, say Linux, with kernel OS mirroring I'd > >expect that the OS mirror would outperform Veritas, if and when it becomes > >available for Linux (maybe it already is?). > > They are very similar but the functionality of Veritas is superior. Veritas is aimed more > at the enterprise where Disksuite is more workgroup. Performance wise both products > have their supporters, on smaller systems DiskSuite has the edge (apparently according > to the Sun performance guys). The other main advantage of DiskSuite especially for home > use is it's free:-)) > > I suppose that Sun would claim they don't need OS drivers, cos you can use the hardware > within the RAID units do most of what you need. I've been told, but never seen figures to > support it, that if you stripe within the RAID arrays at a hardware level and stripe across > the arrays using Veritas then performance is staggering ie the disks are double striped. The disadvantage, there is always one isn't there:-), is to add a new disk or series of > disks the striping has to be unpicked and redone. > > Paul Watson > WF Software Ltd > Tel: +44 1436 674729 > Fax: +44 1436 678729 > www.wfsoftware.com/informix > # If you broke it, hide the evidence > > ********************************************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > the system manager. > > This footnote also confirms that this email message has been swept by > MIMEsweeper for the presence of computer viruses. > > www.mimesweeper.com > ********************************************************************** > Sent via Deja.com http://www.deja.com/ Before you buy.