> -----Original Message----- > From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On > Behalf Of Mark Perry > Sent: Tuesday, May 27, 2008 11:57 AM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Ext3 (Journaling Filesystems) and BARRIERS = > Filesystem Integrity > [snip] > The DASD subsystems have options such as fast-write, which means they > would tell z/VM the write was complete before the data hits a > real disk. > Of course such systems usually come with Non-Volatile memory for their > caches and hence claim data integrity across DASD subsystem restarts. > > But your question really is the one that any one interested in the > integrity of their company's data should be asking ;-) > > mark
I've often been concerned about this. I have been assured that our DASD array has an internal battery which immediately starts "hardening" all RAM resident data to disk when it looses power and has enough juice to keep the entire thing running long enough to flush 100% of the RAM to disk if/when necessary. But I'm still a "worry wart" about not really knowing when the data has been physically written to disk. I have a friend with EMC who is very excited about the new SSD subsystems which are beginning to appear. They sound very nice. Being "green" and all. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
