diff options
| -rw-r--r-- | debian/changelog | 3 | ||||
| -rw-r--r-- | en/appendix/preseed.xml | 4 | ||||
| -rw-r--r-- | en/using-d-i/modules/mdcfg.xml | 75 |
3 files changed, 80 insertions, 2 deletions
diff --git a/debian/changelog b/debian/changelog index 1da20440f..9a4571051 100644 --- a/debian/changelog +++ b/debian/changelog @@ -22,6 +22,9 @@ installation-guide (2008xxxx) UNRELEASED; urgency=medium automatically work w/o it if there's just 1 disk. Closes: #490287 * Document hw-detect/load_firmware. Closes: #493845 + [ Ryan Niebur ] + * Added documentation for RAID 6 and 10. + -- Frans Pop <fjp@debian.org> Wed, 02 Jul 2008 17:06:28 +0200 installation-guide (20080520) unstable; urgency=medium diff --git a/en/appendix/preseed.xml b/en/appendix/preseed.xml index a271ec352..66696db54 100644 --- a/en/appendix/preseed.xml +++ b/en/appendix/preseed.xml @@ -1006,7 +1006,7 @@ d-i partman/confirm boolean true <para> You can also use preseeding to set up partitions on software RAID arrays. -Supported are RAID levels 0, 1 and 5, creating degraded arrays and +Supported are RAID levels 0, 1, 5, 6 and 10, creating degraded arrays and specifying spare devices. If you are using RAID 1, you can preseed grub to install to all devices used in the array; see <xref linkend="preseed-bootloader"/>. @@ -1057,7 +1057,7 @@ spare devices has only been tested lightly. # Parameters are: # <raidtype> <devcount> <sparecount> <fstype> <mountpoint> \ # <devices> <sparedevices> -# RAID levels 0, 1 and 5 are supported; devices are separated using "#" +# RAID levels 0, 1, 5, 6 and 10 are supported; devices are separated using "#" #d-i partman-auto-raid/recipe string \ # 1 2 0 ext3 / \ # /dev/discs/disc0/part1#/dev/discs/disc1/part1 \ diff --git a/en/using-d-i/modules/mdcfg.xml b/en/using-d-i/modules/mdcfg.xml index e1ebb161a..9db8184c5 100644 --- a/en/using-d-i/modules/mdcfg.xml +++ b/en/using-d-i/modules/mdcfg.xml @@ -95,6 +95,42 @@ information. </para></listitem> </varlistentry> +<varlistentry> + +<term>RAID6</term><listitem><para> + +Is similar to RAID5 except that it uses two parity devices instead of +one. + +</para><para> + +A RAID6 array can survive up to two disk failures. + +</para></listitem> +</varlistentry> +<varlistentry> + +<term>RAID10</term><listitem><para> + +RAID10 combines striping (as in RAID0) and mirroring (as in RAID1). +It creates <replaceable>n</replaceable> copies of incoming data and +distributes them across the partitions so that none of the copies of +the same data are on the same device. +The default value of <replaceable>n</replaceable> is 2, but it can be +set to something else in expert mode. The number of partitions used +must be at least <replaceable>n</replaceable>. +RAID10 has different layouts for distributing the copies. The default is +near copies. Near copies have all of the copies at about the same offset +on all of the disks. Far copies have the copies at different offsets on +the disks. Offset copies copy the stripe, not the individual copies. + +</para><para> + +RAID10 can be used to achieve reliability and redundancy without the +drawback of having to calculate parity. + +</para></listitem> +</varlistentry> </variablelist> To sum it up: @@ -139,6 +175,27 @@ To sum it up: </entry> </row> +<row> + <entry>RAID6</entry> + <entry>4</entry> + <entry>optional</entry> + <entry>yes</entry> + <entry> + Size of the smallest partition multiplied by (number of devices in + RAID minus two) + </entry> +</row> + +<row> + <entry>RAID10</entry> + <entry>2</entry> + <entry>optional</entry> + <entry>yes</entry> + <entry> + Total of all partitions divided by the number of chunk copies (defaults to two) + </entry> +</row> + </tbody></tgroup></informaltable> </para><para> @@ -214,6 +271,24 @@ RAID5 has a similar setup procedure as RAID1 with the exception that you need to use at least <emphasis>three</emphasis> active partitions. </para></listitem> +<listitem><para> + +RAID6 also has a similar setup procedure as RAID1 except thatat least +<emphasis>four</emphasis> active partitions are required. + +</para></listitem> +<listitem><para> + +RAID10 again has a similar setup procedure as RAID1 except in expert +mode. In expert mode, &d-i; will ask you for the layout. +The layout has two parts. The first part is the layout type. It is either +<literal>n</literal> (for near copies), <literal>f</literal> (for far +copies), or <literal>o</literal> (for offset copies). The second part is +the number of copies to make of the data. There must be at least that +many active devices so that all of the copies can be distributed onto +different disks. + +</para></listitem> </itemizedlist> <para> |