The answer to your question is ..... It depends. I have HP-XP disk, IBM DS6800, EMC Clariion. Case in point, I lost 2 disks on one weekend on the HP disk array about 3 years ago and I think I've lost 2 total since then. None of them were hard failures but preventive maintenance due to soft errors. I have lost 2 on the Clariion within the past 2 weeks, one hard failure and one soft - but I just installed upgraded firmware on the controllers recently which purportedly made the predictive analysis better, so were these drives throwing errors before that weren't being caught or not? I've been running the DS6800 for about a year now and haven't suffered a failure on it yet.
One minor frustration on the HP disk, which is attached to my Z as well as HP-UX and AIX boxes. The Z only uses the HP disk at night for data exchange between Z and HP-UX. Invariably I find out that the HP disk has a failure when the Z starts using the array. Regardless of whether the failing HDA is being used on the Z or not, the Z is the only box reporting the SIM errors. It would be nice if the other platforms would have a better error reporting structure. In the case of both the HP and EMC disk, the dynamic sparing (as well as the RAID configurations) worked as advertised. Completely painless replacements. HTH Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Lizette Koehler Sent: Friday, April 13, 2007 2:09 PM To: [EMAIL PROTECTED] Subject: Question on DASD Hardware I have a general question. Does anyone know where I can find information about how often a disk needs to be replaced or does dynamic sparing inside these new fangle DASD Boxes from IBM, EMC, or Hitachi? I am not talking about the mainframe dasd itself. But rather the disk in the box that the mainframe dasd is mapped (?) too? I have heard that a CE has to replace at least 1 disk per month on some of these boxes. (DMX3000 - EMC, DS8000 - IBM, etc....) So I guess I am looking at MTTF for the disk. Lizette ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
