lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 10 Dec 2008 19:11:00 -0500 From: Bill Davidsen <davidsen@....com> To: Justin Piszcz <jpiszcz@...idpixels.com> CC: linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org, xfs@....sgi.com, smartmontools-support@...ts.sourceforge.net Subject: Re: Have the velociraptors in a test system now, checkout the errors. Justin Piszcz wrote: > Point of thread: Two problems, mentioned in detail below, NCQ in Linux > when used in a RAID configuration and two, something with how Linux > interacts with the drives causes lots of problems as when I run the WD > tools on the disks, they do not show any errors. > > If anyone has/would like me to run any debugging/patches/etc on this > system feel free to suggest/send me things to try out. After I put > the VR's in a test system, I left NCQ enabled and I made a 10 disk > raid5 to see how fast I could get it to fail, I ran bonnie++ shown > below as a disk benchmark/stress test: > > For the next test I will repeat this one but with NCQ disabled, having > NCQ enabled makes it fail very easily. Then I want to re-run the test > with RAID6. > > bonnie++ -d /r1/test -s 1000G -m p63 -n 16:100000:16:64 > > $ df -h > /dev/md3 2.5T 5.5M 2.5T 1% /r1 > > And the results? Two disk "failures" according to md/Linux within a > few hours as shown below: > > Note, the NCQ-related errors are what I talk about all of the time, if > you use > NCQ and Linux in a RAID environment with WD drives, well-- good luck. > > Two-disks failed out of the RAID5 and I currentlty cannot even 'see' > one of the drives with smartctl, will reboot the host and check sde > again. > > After a reboot, it comes up and has no errors, really makes one wonder > where/what the bugs is/are, there are two I can see: > 1. NCQ issue on at least WD drives in Linux in SW md/RAID > 2. Velociraptor/other disks reporting all kinds of sector errors etc, > but when you use the WD 11.x disk tools program and run all of their > tests it says the disks have no problems whatsoever! The smart > statistics do confirm this. Currently, TLER is on for all disks, for > the duration of these tests. Just a few comments on this, I have several RAID arrays built on Seagate using NCQ, and yet to have a problem. I have NCQ on with my WD drives, non-RAID, and haven't had an issue with them either. The WDs run a lot cooler than the SG, but they are probably getting less use, as well. If the WD are still on sale after the holiday I may grab a few more and run RAID, by then I will have some small sense of trusting them. -- Bill Davidsen <davidsen@....com> "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists