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Exalytics: Unable To Mount SSD Volume After Reboot Of Exalytics System (Doc ID 2618835.1)

Last updated on DECEMBER 11, 2019

Applies to:

Exalytics In-Memory Machine X3-4 - Version All Versions and later
Information in this document applies to any platform.

Goal

A failed flash card has been detected and field task has been created for Oracle field engineer to replace it.

When following the steps from "Section 7A. Raid01 restoration steps" from How to Replace a Flash Accelerator PCIe Card in an Oracle Exalytics X2-4 or X3-4 system (Doc ID 1599510.1), software RAID status was not reflecting RAID0 configuration
and both RAID0 arrays /dev/md1 and /dev/md2 are shown as inactive.

 

$more mdstat
Personalities :
md2 : inactive sdd[0](S) sdm[11](S) sdj[10](S) sdl[9](S) sdk[8](S) sdi[7](S) sdg[6](S) sdh[5](S) sdf[4](S) sde[2](S) sdc[1](S)
     1074217408 blocks
      
md1 : inactive sdq[0](S) sdv[11](S) sdx[10](S) sdw[9](S) sdy[8](S) sds[7](S) sdt[6](S) sdr[5](S) sdu[4](S) sdo[3](S) sdp[1](S)
     1074217408 blocks


As seen above mdstat shows that both md1 and md2 were one device short and only show 11 out of 12 devices. This is unexpected as there was only single device failure on /dev/md2.


Correct mdadm configuration as per mdadm.conf file should be as shown below:

ARRAY /dev/md1 level=raid0 num-devices=12 metadata=0.90 UUID=7b67f270:74b20040:fa43f670:54da56bf
devices=/dev/sdr,/dev/sdq,/dev/sdo,/dev/sdp,/dev/sdv,/dev/sds,/dev/sdu,/dev/sdt,(/dev/sdz),/dev/sdx,/dev/sdy,/dev/sdw

ARRAY /dev/md2 level=raid0 num-devices=12 metadata=0.90 UUID=2001a4b7:b88bb653:5cbead88:0af7d7d6
devices=/dev/sde,/dev/sdd,/dev/sdf,/dev/sdc,/dev/sdg,/dev/sdi,/dev/sdh,/dev/sdj,/dev/sdl,/dev/sdm,/dev/sdk,(dev/sdn)

ARRAY /dev/md3 level=raid1 num-devices=2 metadata=0.90 UUID=b382494b:a3f540bc:eedd7436:5efd5853
devices=/dev/md1,/dev/md2

 

Solution

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In this Document
Goal
Solution
References


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