Many times a new box is populated with back-end drives from the same "batch" of hardware, with the same MTBF. The result is that many drives will tend to fail about the same time.
-----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of R.S. Sent: Wednesday, July 8, 2020 3:37 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [External] Re: Storage & tape question [CAUTION: This Email is from outside the Organization. Unless you trust the sender, Don’t click links or open attachments as it may be a Phishing email, which can steal your Information and compromise your Computer.] I would say it is not because of extra workload, but rather result of some "epidemic" - the reason which caused first drive failure also somehow affect other drives. Last, but not least array controler (electronics) is also suspected. My €0.02 -- Radoslaw Skorupka Lodz, Poland W dniu 07.07.2020 o 20:41, Pommier, Rex pisze: > Regarding the second disk failing while the first was rebuilding, I've heard > more than once that a second failure in a RAID array shortly after the first, > while the rebuild is happening is not that uncommon. Something about the > sudden extra stress on the rest of the drives in the RAID set due to their > ultra high utilization trying to get the failed drive rebuilt. Has anybody > else heard this? Is there documented validity to this assertion? > > Rex > > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On > Behalf Of John McKown > Sent: Tuesday, July 7, 2020 8:58 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: [External] Re: Storage & tape question > > <snipped to the relevant portions for my question> > > We had a similar problem occurs, long ago, with an actual SAN dasd array (for > Windows, not MVS). Weekend backup to physical tape aborted on a Sunday. The > Windows admin said "No problem, it's a RAID-5 array, I can fix it Monday > morning." A few hours later, a disk in the array failed. No problem, right? > Unfortunately, while the CE was on his way in to replace it, a second disk > failed. The array was destroyed. Management said to repair it and reload from > the Sunday backup and we'd be good. When the admin admitted that the backup > failed and he didn't go in, he was immediately terminated. ***** Now, > what are the chances that 2 drives in an array will fail within hours? I > don't know, but one thing many don't think about with a "new array" is that > all the drives are likely the same age and will start to fail (if they are) > about the same time. ***** > > > The information contained in this message is confidential, protected from > disclosure and may be legally privileged. If the reader of this message is > not the intended recipient or an employee or agent responsible for delivering > this message to the intended recipient, you are hereby notified that any > disclosure, distribution, copying, or any action taken or action omitted in > reliance on it, is strictly prohibited and may be unlawful. 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