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docs/source/guides/admin-guides/manage_clusters/common/deployment/raid_cfg.rst

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refine the doc on raid on rh7
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immarvin 2016-11-30 04:37:09 -05:00
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docs/source/guides/admin-guides/manage_clusters/common/deployment/raid_cfg.rst
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@ -1,12 +1,10 @@
Configure RAID before Deploy OS
===============================
Configure RAID before deploying the OS
======================================
Overview
--------
This section describes how to use xCAT to deploy diskful nodes with RAID1 setup, and the procedure for RAID1 maintainence activities such as replacing a failed disk.
xCAT provides an user interface :doc:`linuximage.partitionfile </guides/admin-guides/manage_clusters/common/deployment/cfg_partition>` to specify the customized partition script for diskful provision, and provides some default partition scripts to configure RAID1 on system Power server.
xCAT provides an user interface :doc:`linuximage.partitionfile </guides/admin-guides/manage_clusters/common/deployment/cfg_partition>` to specify the customized partition script for diskful provision, and provides some default partition scripts.
Deploy Diskful Nodes with RAID1 Setup on RedHat
@ -14,20 +12,20 @@ Deploy Diskful Nodes with RAID1 Setup on RedHat
xCAT provides a partition script `raid1_rh.partscript <https://github.com/xcat2/xcat-extensions/raid1_rh.partscript>`_ which setup RAID1 on 2 disks on Power8 LE server, "raid1_rh.partscript" is composed of 2 parts:
1) the logic to pickup the disks to setup RAID
2) the logic to generate raid/partition scheme file "/tmp/partitionfile".
# the logic to select the disks to setup RAID
# the logic to generate the partition scheme and save it to /tmp/partitionfile in the installer.
In most cases, this partition script "raid1_rh.partscript" is suffice for you to create a basic 2-disk RAID1 on your server. If you have some specific requirements on disks or partition scheme of the RAID, you need to provide your own partition script, "raid1_rh.partscript" is self-explanation and can be a reference for you. To simplify the introduction here, "raid1_rh.partscript" will be used as the partition script, the steps is listed below:
In most scenarios, the sample partitioning script is sufficient to create a basic RAID1 across two disks and is provided as a sample to build upon.
1. obtain the partition script: ::
1. Obtain the partition script: ::
wget <url> -O /install/custom/raid1_rh.partscript
2. specify the partition script for osimage: ::
2. Associate the partition script to the osimage: ::
chdef -t osimage -o rhels7.3-ppc64le-install-compute partitionfile="s:/install/custom/raid1_rh.partscript"
chdef -t osimage -o rhels7.3-ppc64le-install-compute partitionfile="s:/install/custom/partition/rhels7/raid1.partitionfile"
3. provision the node: ::
3. Provision the node: ::
rinstall cn1 osimage=rhels7.3-ppc64le-install-compute
@ -36,28 +34,33 @@ After the diskful nodes are up and running, you can check the RAID1 settings wit
Mount command shows the ``/dev/mdx`` devices are mounted to various file systems, the ``/dev/mdx`` indicates that the RAID is being used on this node. ::
# mount
/dev/md2 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/md0 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
...
/dev/md1 on / type xfs (rw,relatime,attr2,inode64,noquota)
/dev/md0 on /boot type xfs (rw,relatime,attr2,inode64,noquota)
/dev/md2 on /var type xfs (rw,relatime,attr2,inode64,noquota)
The file ``/proc/mdstat`` includes the RAID devices status on the system, here is an example of ``/proc/mdstat`` in the non-multipath environment: ::
# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sda5[0] sdb5[1]
19706812 blocks super 1.1 [2/2] [UU]
md2 : active raid1 sdk2[0] sdj2[1]
1047552 blocks super 1.2 [2/2] [UU]
resync=DELAYED
bitmap: 1/1 pages [64KB], 65536KB chunk
md1 : active raid1 sda2[0] sdb2[1]
1048568 blocks super 1.1 [2/2] [UU]
md0 : active raid1 sda3[0] sdb3[1]
204788 blocks super 1.0 [2/2] [UU]
md3 : active raid1 sdk3[0] sdj3[1]
1047552 blocks super 1.2 [2/2] [UU]
resync=DELAYED
md0 : active raid1 sdk5[0] sdj5[1]
524224 blocks super 1.0 [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md1 : active raid1 sdk6[0] sdj6[1]
973998080 blocks super 1.2 [2/2] [UU]
[==>..................] resync = 12.8% (125356224/973998080) finish=138.1min speed=102389K/sec
bitmap: 1/1 pages [64KB], 65536KB chunk
unused devices: <none>
On the system with multipath configuration, the ``/proc/mdstat`` looks like: ::