>From S/390 point of view, usually, what you have is a hot swap set up so that when a specific drive dies, the rest of the drives in the raid group copy themselves over to the hot swaps and rebuild the lost data as it goes.
You then fix the bad drive as soon as possible. S/390 DASD controllers can, in some cases, actually place the call themselves, so your first indication that a problem exists in the FE walking in with a new drawer. In the Intel world, where much of this capability doesn't exist, if you lose a drive from a raid set, you depend on how the hardware is setup for the spare. If it spares just the bad drive, but not all of the drives in the raid set, you may have other drives in the set go bad and now you are without a spare. Just because data is on a RAID doesn't mean you stop taking backups; your last line of defense is always going to be that dump to tape at regular intervals. Garry E. Ward Senior Software Specialist Maritz Research, Automotive Research Group 419-725-4123 -----Original Message----- From: Dennis Wicks [mailto:[EMAIL PROTECTED]] Sent: Monday, February 10, 2003 1:57 PM To: [EMAIL PROTECTED] Subject: raid question Greetings; (Posted to LINUX-390 and debian-s390 lists) I came across an unsettling bit of info a while back. I was told that if you lose one volume of a raid set you can replace and the data will get rebuilt, but if you lose a second volume before you get the first one rebuilt you will lose all the data -- irretrievably! Is this true? Is there any reasonable way to get around it? Is there a reasonable alternative to raid? As always, Many TIA! Dennis -- Dennis G. Wicks Systems Programmer [EMAIL PROTECTED] Communications Data Group Tel: (217)355-7117 Fax: (217)351-6994 102 S. Duncan Rd. Champaign, IL 61822 Confidentiality Warning: This e-mail contains information intended only for the use of the individual or entity named above. If the reader of this e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, any dissemination, publication or copying of this e-mail is strictly prohibited. The sender does not accept any responsibility for any loss, disruption or damage to your data or computer system that may occur while using data contained in, or transmitted with, this e-mail. If you have received this e-mail in error, please immediately notify us by return e-mail. Thank you.
