The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main as well.
[EMAIL PROTECTED] writes: > 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. here is some MTBF numbers of some disks http://www.digit-life.com/articles2/storage/maxtor15k2.html in the million-plus hrs. however, there has been some recent articles on how accurate published numbers might really be (and/or what the distribution actually works out to be) Hard disk test 'surprises' Google http://news.bbc.co.uk/2/hi/technology/6376021.stm Google Releases Paper on Disk Reliability http://hardware.slashdot.org/hardware/07/02/18/0420247.shtml Failure Trends in a Large Disk Drive Population http://labs.google.com/papers/disk_failures.pdf there have been articles in the past about disk MTBF can be highly skewed (some very early ... and then very late ... as opposed to any sort of even or random distribution). ---------------------------------------------------------------------- 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
