308 lines
4.6 KiB
HTML
308 lines
4.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>The MD region manager</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="EVMS User Guide"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Deleting partitions"
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HREF="deletedos.html"><LINK
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REL="NEXT"
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TITLE="Characteristics of Linux RAID levels"
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HREF="characraidlvls.html"></HEAD
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><BODY
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CLASS="appendix"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>EVMS User Guide</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="deletedos.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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VALIGN="bottom"
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="characraidlvls.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="appendix"
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><H1
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><A
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NAME="appxmdreg"
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></A
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>Appendix B. The MD region manager</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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><DT
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>B.1. <A
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HREF="characraidlvls.html"
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>Characteristics of Linux RAID levels</A
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></DT
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><DD
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><DL
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><DT
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>B.1.1. <A
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HREF="characraidlvls.html#linearmode"
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>Linear mode</A
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></DT
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><DT
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>B.1.2. <A
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HREF="characraidlvls.html#raid0"
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>RAID-0</A
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></DT
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><DT
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>B.1.3. <A
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HREF="characraidlvls.html#raid1"
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>RAID-1</A
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></DT
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><DT
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>B.1.4. <A
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HREF="characraidlvls.html#raid45"
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>RAID-4/5</A
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></DT
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><DT
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>B.1.5. <A
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HREF="characraidlvls.html#multipath"
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>Multipath</A
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></DT
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></DL
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></DD
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><DT
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>B.2. <A
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HREF="createmdreg.html"
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>Creating an MD region</A
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></DT
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><DD
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><DL
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><DT
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>B.2.1. <A
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HREF="createmdreg.html#raid0options"
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>RAID-0 options</A
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></DT
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><DT
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>B.2.2. <A
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HREF="createmdreg.html#raid2options"
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>RAID-1 options</A
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></DT
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><DT
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>B.2.3. <A
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HREF="createmdreg.html#raid45options"
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>RAID-4/5 options</A
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></DT
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></DL
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></DD
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><DT
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>B.3. <A
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HREF="activepsareobjs.html"
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>Active and spare objects</A
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></DT
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><DD
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><DL
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><DT
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>B.3.1. <A
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HREF="activepsareobjs.html#addspareobjs"
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>Adding spare objects</A
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></DT
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><DT
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>B.3.2. <A
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HREF="activepsareobjs.html#remspareobjs"
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>Removing spare objects</A
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></DT
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><DT
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>B.3.3. <A
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HREF="activepsareobjs.html#addactobjsr1"
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>Adding active objects to RAID-1</A
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></DT
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></DL
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></DD
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><DT
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>B.4. <A
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HREF="faultobjs.html"
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>Faulty objects</A
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></DT
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><DD
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><DL
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><DT
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>B.4.1. <A
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HREF="faultobjs.html#remfaultyobjs"
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>Removing faulty objects</A
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></DT
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><DT
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>B.4.2. <A
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HREF="faultobjs.html#fixtempfailedobjs"
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>Fixing temporarily failed objects</A
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></DT
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><DT
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>B.4.3. <A
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HREF="faultobjs.html#markobjsfaulty"
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>Marking objects faulty</A
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></DT
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></DL
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></DD
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><DT
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>B.5. <A
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HREF="resizemdreg.html"
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>Resizing MD regions</A
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></DT
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><DD
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><DL
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><DT
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>B.5.1. <A
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HREF="resizemdreg.html#linear"
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>Linear</A
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></DT
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><DT
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>B.5.2. <A
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HREF="resizemdreg.html#resizeraid0"
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>RAID-0</A
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></DT
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><DT
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>B.5.3. <A
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HREF="resizemdreg.html#resizeraid1"
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>RAID-1</A
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></DT
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><DT
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>B.5.4. <A
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HREF="resizemdreg.html#resizeRAID-45"
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>RAID-4/5</A
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></DT
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></DL
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></DD
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><DT
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>B.6. <A
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HREF="replaceobjs.html"
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>Replacing objects</A
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></DT
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></DL
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></DIV
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><P
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> The Multi-Disk (MD) driver in the Linux kernel and the MD plug-in in
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EVMS provide a software implementation of RAID (Redundant Array of
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Inexpensive Disks). The basic idea of software RAID is to combine
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multiple hard disks into an array of disks in order to improve capacity,
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performance, and reliability.
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</P
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><P
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> The RAID standard defines a wide variety of methods for combining disks
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into a RAID array.
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In Linux, MD implements a subset of the full RAID standard, including
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RAID-0, RAID-1, RAID-4, and RAID-5. In addition, MD also supports
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additional combinations called Linear-RAID and Multipath.
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</P
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><P
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> In addition to this appendix, more information about RAID and the
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Linux MD driver can be found in the Software RAID HOWTO at
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<A
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HREF="http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html"
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TARGET="_top"
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>www.tldp.org/HOWTO/Software-RAID-HOWTO.html</A
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>.
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</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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HREF="deletedos.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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HREF="characraidlvls.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
|
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>Deleting partitions</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
|
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VALIGN="top"
|
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> </TD
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><TD
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WIDTH="33%"
|
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ALIGN="right"
|
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VALIGN="top"
|
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>Characteristics of Linux RAID levels</TD
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></TR
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></TABLE
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></DIV
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></BODY
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