NCS 540 OBFL Flash access failed : Read-only file system

[jm-barreto]

Greetings 

I have a N540-24Z8Q2C-M and start receiving log message from OBFL flash  

0/RP0/ADMIN0:Dec 17 14:12:57.777 AST: mediasvr[2623]: %MEDIASVR-MEDIASVR-4-OBFL_FLASH_ACCESS_FAILED : OBFL flash access failed, error : Read-only file system
0/RP0/ADMIN0:Dec 17 14:12:57.795 AST: mediasvr[2623]: %MEDIASVR-MEDIASVR-4-KERN_OBFL_MSG1 : obfl, kern msg : Kernel UBIFS error message in kernel log, check obfl flash.

0/RP0/ADMIN0:Dec 17 16:17:04.711 AST: obfl_mgr[2626]: %INFRA-OBFL_MGR_COMMON-3-OBFL_DEV_ERROR : OBFL device access error : -904919038 [OBFL no str version for this error ]

I read this article https://community.cisco.com/t5/tkb-サービスプロバイダ-ドキュメント/ncs5500-mediasvr-mediasvr-4-obfl-flash-access-failed/ta-p/4171382 But notice that the steps are for ncs5500. Its there a documentation for the NCS540 to fix this?

I will appreciate any information that you can provide.

Thanks

[Cristian Matei]

Hi,

   Most probably you're encountering a known issue, see your options here:

https://www.cisco.com/c/en/us/support/docs/field-notices/721/fn72107.html

Thanks,

Cristian.

[jm-barreto]

That issue is for SSD harddrive and that only affect firmware up to 7.3.x. I'm in  7.4.2 that is already fixed.

Thanks for the information.

[paul driver]

Hello 
possibly a bug - try checking your software for any related SMUs pertaining to this issue or upgrade  

[jm-barreto · Accepted solution]

I manage to follow the fix that I post for the NCS 5500 and it works for the NCS 540. Here are the steps

prior confirmation
sysadmin-vm:0_RP0# run
[sysadmin-vm:0_RP0:~]$mount | grep plug
/dev/ubi3_0 on /mnt/plog type ubifs (ro, relatime) <<<<< Before performing the procedure, reconfirm that the target FS is ro
[sysadmin-vm:0_RP0:~]$ls -l /mnt/plog
---snip---

formatting instructions:
[sysadmin-vm:0_RP0:~]$
[sysadmin-vm:0_RP0:~]$umount /mnt/plog/[sysadmin-vm:0_RP0:~]$mount | grep plug
[sysadmin-vm:0_RP0:~]$arp
---snip---
[sysadmin-vm:0_RP0:~]$ssh 10.0.2.16 <<< Connect to host OS
[host:0_RP0:~]$ ubidetach -m 3
[host:0_RP0:~]$ ubiformat /dev/mtd3 <<< It takes about a few minutes
ubiformat: mtd3 (nor), size 18874368 bytes (18.0 MiB), 144 eraseblocks of 131072 bytes (128.0 KiB), min. I/O size 1 bytes

libscan: scanning eraseblock 0 -- 0 % complete
libscan: scanning eraseblock 1 -- 1 % complete
libscan: scanning eraseblock 2 -- 2 % complete
---snip---
ubiformat: formatting eraseblock 143 -- 100% complete

[host:0_RP0:~]$
[host:0_RP0:~]$ ubiattach -m 3 -d 3
UBI device number 3, total 144 LEBs (18855936 bytes, 18.0 MiB), available 140 LEBs (18332160 bytes, 17.5 MiB), LEB size 130944 bytes (127.9 KiB)
[host:0_RP0:~]$ ubimkvol /dev/ubi3 -N plug -m
Set volume size to 18332160
Volume ID 0, size 140 LEBs (18332160 bytes, 17.5 MiB), LEB size 130944 bytes (127.9 KiB), dynamic, name "plog", alignment 1
[host:0_RP0:~]$ exit <<< Return to guest OS shell of sysadmin VM
---snip---
Connection to 10.0.2.16 closed.

[sysadmin-vm:0_RP0:~]$mount /dev/ubi3_0 /mnt/plog -t ubifs
[sysadmin-vm:0_RP0:~]$mount | grep plug
Confirm that /dev/ubi3_0 on /mnt/plog type ubifs (rw, relatime) <<<< rw
[sysadmin-vm:0_RP0:~]$ls -l /mnt/plog
Total 0
[sysadmin-vm:0_RP0:~]$

restart obfl_mgr process
show processes all loc 0/RP0 | inc obfl
process restart obfl_mgr location 0/RP0
show processes all loc 0/RP0 | inc obfl
run ls -l /mnt/plog/

Check if syslog output stops after watching for more than 10 minutes
XR VM:
Show logging