Ted, I don't agree that this is conventional wisdom for SSD. The target datasets for SSD are (a) very low read cache hit percentage, (b) very high sibling pend delays, or (c) a net D2C and C2D IO demand that exceeds the capabiltiy of disk drives a used capacity ratio around 10% (depends on what you pay for disk and SSD).
I would suggest that only part of many high profile databases meet that criteria. I think the 80/20 or 90/10 ROT are still alive and kicking. Ron ________________________________ From: Ted MacNEIL <[email protected]> To: [email protected] Sent: Mon, March 29, 2010 3:06:19 PM Subject: Re: [IBM-MAIN] Mainframe Executive article on the death of tape >You have a very high profile database, get a solid-state storage system to put >the data on. I know that is the conventional wisdom. >Lower priority stuff gets to stay on the old hard round/brown disks. I saw a presentation, at CMG Canada last month, where the presenter showed the benefits, of putting something not so loved on SSD, and everybody won because it was moved out of the way. Commercial grade SSD is an order of magnitude more expensive than the stuff you find in cell phones and digital cameras. - Too busy driving to stop for gas! ---------------------------------------------------------------------- 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
