Re: Catastrophic disk failure, where was smartd?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Roger Heflin wrote:

The big issue is that most of the smart implementations don't scan the disk for bad blocks, and in my experience several years ago with a 1000+ disks in services was that the #1 failure was bad blocks, and smart did little to catch that. The #2 failure was failure to spin up at all, but this seemed to be confined to certain batches.

Isn't that what the long surface scan test is supposed to do?


Probably. I started using dd test before disks and Linux and other oses supported smart. It works on any disk (or array) whether smart works or not.

That only catches 'hard' errors. Modern drives have spare sectors and the ability to remap soft errors internally, up to a point, before the OS knows anything about them. If the OS (or dd) sees an error, it means you've used up the spares or the internal retries weren't able to fix it. The smart interface is supposed to let you know far along you are in using up the internal correction and how often soft errors are hidden by the retries. It seems good in theory, and if it predicts the drive is going bad you should probably believe it. But, I think a lot of drives fail faster than the internal corrections can handle so you often don't get any warning.

--
  Les Mikesell
   lesmikesll@xxxxxxxxx

--
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [Fedora Magazine]     [Fedora News]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Maintainers]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Legacy]     [Fedora Desktop]     [Fedora Fonts]     [ATA RAID]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [SSH]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Centos]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Tux]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Asterisk PBX]     [Fedora Sparc]     [Fedora Universal Network Connector]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux