Emerson ATCA-S201 Manuel D’Utilisation

RTM-ATCA-SXXX Overview 

6806800H62B 

ATCA‐S201 Installation and Use Guide 

 

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md0

 

Use this drop down menu to choose a volume name.  Four choices: md0, md1,md2 or md3 

Submit

 

Click to commit the selections and create the new RAID device. 

 Ignore Warnings 

‘Radio button’ will ignore minor mdadm warnings.  Example ignore warning when creating 
RAID1 with disks that have greater than 1% capacity difference.   This Filed self-clears on 
each use. 

 Import Foreign Array  Will display ONLY in situations when a drive contains meta-data that indicates it was at one 

time a member of a software RAID volume.  Click and select participating drives to attempt 
an import of the volume.   

 Clear ownership 

Will display ONLY in situations when a drive contains meta-data that indicates it was at one 
time a member of a software RAID volume.  Click and select drives to clear all meta-data 
stored on these disk(s).  This operation will permanently eliminate the import array option. 

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5.  A maximum of 4 software-RAID volumes may be defined on each 

ATCA-S201

.   

6.  The default stripe size is 64KB, but can be changed by creating the array using 

the CLI mdadm tool instead. 

7.  A user may assign multiple spare disks to each volume.  

5.3.2  Software RAID, CLI command syntax 

Table 27 CLI command syntax, mdadm: manage RAID configuration 

Create new volume  

--create 

“Create” mode, used initialize a new md array, associate some devices with it, 
and activate the array. 

Device name assigned to new volume.  Example /dev/md0. 

<#devices> 

Integer, specifies the number of <component-devices> 

<raidlevel> 

Integer: 4=raid4, 5=raid5, 6=raid6 

<stripe_size> 

Optional, will default to 64 if omitted, expressed in kilobytes.  Within a stripe, 

this defines the ‘chunk’ of data read or written to any single member disk. 

<component-devices> 

Space delimited list of component devices.  Example /dev/sda /dev/sdb… 

Preserve  new volume 

attributes 

 

 

Issue this command immediately after creating a new volume.  This command 
preserves key volume parameters, and ensures the new volume is available 

across system reboots. 

List volume status 

mdadm --detail --scan  

 

Issue this command at any time to inspect volume status 

Create hot spare  

--add 

Used to add a spare disk to an existing raid-device.  Users may issue this 
commend any number of times to specify multiple spare drives if available. 

Device name assigned to existing volume.  Example /dev/md0 

<spare-device> 

Designate spare device.  Example /dev/sda  

Remove faulty disk