From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Timothy D. Lenz" Subject: Re: Mixing WD red with older seagates Date: Mon, 09 Sep 2013 14:35:21 -0700 Message-ID: <522E3F19.1010300@vorgon.com> References: <522D4369.80404@vorgon.com> <522D457D.1000900@smartguide.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org Cc: Linux RAID List-Id: linux-raid.ids On 9/9/2013 7:56 AM, Mathias Bur=C3=A9n wrote: > On 9 September 2013 15:38, Jonathan Wilson wrote: >> On Mon, 2013-09-09 at 13:50 +1000, Tudor Holton wrote: >>> Completely anecdotal evidence, but I was mixing WD Reds and Seagate= s in >>> a QNAP RAID 6 each 3TB for a total of 6TB, and the Seagates kept ma= king >>> sounds like they were about to hurl. Testing each drive individual= ly >>> with badblocks and smart came up with all drives OK. But it kept >>> chucking the WDs one by one. Eventually I removed the Seagates and >>> replaced them with WDs and since then no drives have been thrown ou= t. >>> >>> I can only theorise that there may be a timing issue between WD Red= s and >>> Seagate. >> >> I wonder if the vibrations of the Seagates was causing the reds to b= e >> thrown? >> >> From what I've read (assuming I understand correctly) they are a lo= w-ish >> vibration drive with some fancy head positioning for alignment... bu= t >> should be limited to 5 at most, or at least are intended for upto 5 >> drive systems, so I wonder if this means that more than 5 could suff= er >> from vibrations throwing disks out? >> >> All that said, I wonder just how sensitive drives are nowadays? Whil= e I >> have heard of tales of old where someone sneezing in the computer ro= om >> would cause large raid clusters to pop I don't know how true they ar= e or >> how sensitive drives are to the accumulative vibrations of many disk= s or >> if its more of a case that as the number of disks increases then the >> statistical chance of a drive failing increases to the point that it= is >> more likely to happen in coincidence with an external event, such as= a >> sneeze. >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid= " in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > The sneeze story isn't true. Modern enterprise are sensitive, for > example some 24k RPM fans will cause drives to fail within time, but > 12k fans won't (40mm). > > However, if your room and your servers are normal, you've nothing to > worry about. > > Mathias > -- Sounds like what you guys are saying is that if I switch to the red, I=20 need to replace all the seagate drives? And it kind of sounds like they are overly touchy. I would expect them=20 to be more immune to vibrations. What I have is a 7' rack cabinet with a 2500w rack mount ups near the=20 bottom. Above that a bit of space followed by a KBM switch and network=20 switch. Then an HP laser printer on rails to pull it out for easier use= =2E=20 Above that a 4u case with my main computer which has 4 wd drives, ( 2=20 160Gb and a 500Gb). Right above that is the linux vdr computer with the= =20 raid seagate drives. And after mdadm fails a drive, it is bad. SMART and other programs=20 report it so. mdadm hasn't failed this one yet, but it is just a matter= =20 of time. I get daily messages about the bad sectors. ----------------------------------------------------------- This email was generated by the smartd daemon running on: host name: x64VDR DNS domain: tdl NIS domain: (none) The following warning/error was logged by the smartd daemon: Device: /dev/sdc, 49 Currently unreadable (pending) sectors =46or details see host's SYSLOG. You can also use the smartctl utility for further investigation. The original email about this issue was sent at Fri Sep 6 23:56:48 201= 3 MST Another email message will be sent in 24 hours if the problem persists. ----------------------------------------------------------- This email was generated by the smartd daemon running on: host name: x64VDR DNS domain: tdl NIS domain: (none) The following warning/error was logged by the smartd daemon: Device: /dev/sdc, 49 Offline uncorrectable sectors =46or details see host's SYSLOG. You can also use the smartctl utility for further investigation. The original email about this issue was sent at Fri Sep 6 23:56:58 201= 3 MST Another email message will be sent in 24 hours if the problem persists. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html