Re: RAID10 not working in install

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

 



Stuart Sears wrote:
Brian Chadwick wrote:
Bill Davidsen wrote:
my understanding of RAID 10 is that its a mirrored array of striped
disks. Hence 4 disks, well at least 4 partitions, required.

not exactly. The RAID10 target for mdadm will work on fewer disks -
effectively it does striping and mirroring internally (think, in rough
terms of >=2 stripes for each write, arranged such that each copy of a
chunk is written to a different disk.)

to the OP:
However, I hardly see the point on only 2 disks. What will you gain from
 this that you don't gain from RAID1? you are more-or-less just striping
twice, once in each direction, for each write.

The raw read speed on a RAID1 array is the speed of a single drive. The raw read speed for RAID10(far) is N times that, N being number of drives. That's the same speed as RAID0, essentially. So RAID10 is somewhat slower for write and much faster for read. That's desirable for many things.

There's info in the md and mdadm man pages about the details.

--
Bill Davidsen <davidsen@xxxxxxx>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

--
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