Raid Status in Nexus 7710 Switches

[venkateshwarlu.t]

When we are trying to find raid status in Nexus 7710 switches, we are not getting required output. Looks something wrong ?

Output from of Nexus 7710 

==================== 

Switch002# show system internal raid
Current RAID status info:
RAID data from CMOS = 0x61 0xf3
RAID data from driver disks 0 bad 0 name
Bootflash: /dev/sdb
/bin/cat: /var/log/boot_node_mirror: No such file or directory
Mirrorflash:
Current RAID status:
Personalities : [raid1]
unused devices: <none>
Bootup RAID status:
Personalities : [raid1]
unused devices: <none>
RAID Monitor log:
/bin/cat: /var/log/raid_monitor.log: No such file or directory
---------------------------------------------------
Switch002#

Switch002# show system internal raid | grep -A 1 "Current RAID status info"
/bin/cat: /var/log/boot_node_mirror: No such file or directory
/bin/cat: /var/log/raid_monitor.log: No such file or directory
Current RAID status info:
RAID data from CMOS = 0x61 0xf3
Switch002# sh version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html
Copyright (c) 2002-2014, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under
license. Certain components of this software are licensed under
the GNU General Public License (GPL) version 2.0 or the GNU
Lesser General Public License (LGPL) Version 2.1. A copy of each
such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://www.opensource.org/licenses/lgpl-2.1.php

Software
BIOS: version 3.1.0
kickstart: version 6.2(12)
system: version 6.2(12)
BIOS compile time: 02/27/2013
kickstart image file is: bootflash:///n7700-s2-kickstart.6.2.12.bin
kickstart compile time: 12/3/2014 18:00:00 [02/03/2015 02:11:17]
system image file is: bootflash:///n7700-s2-dk9.6.2.12.bin
system compile time: 12/3/2014 18:00:00 [02/03/2015 03:42:21]

Hardware
cisco Nexus7700 C7710 (10 Slot) Chassis ("Supervisor Module-2")
Intel(R) Xeon(R) CPU with 32745060 kB of memory.
Processor Board ID JAE193601EZ

Device name: Switch002
bootflash: 4014080 kB
slot0: 0 kB (expansion flash)

Kernel uptime is 1745 day(s), 1 hour(s), 16 minute(s), 35 second(s)

Last reset
Reason: Unknown
System version: 6.2(12)
Service:

plugin
Core Plugin, Ethernet Plugin
Switch002#

=========================================== 

Any other commands to get correct output ?

[Christopher Hart]

Hello!

I am assuming that you are verifying the health of the internal RAID to proactively check for a defect similar to CSCus22805. Please note that this specific defect (as well as the commands used to detect it, such as show system internal raid) are specific to the Nexus 7000 series of switches. It is expected for this same command executed on the Nexus 7700 series switches to be significantly different.

To check for similar failures on Nexus 7700 series switches, you will need to use the show system internal kernel messages command. Within the output of this command, you will need to look for output suggesting that storage devices are mounted or re-mounted in a read-only state. For example:

N77-C7718# show system internal kernel messages | include only
[5092783.060721] Remounting filesystem read-only
[5095142.453497] Remounting filesystem read-only

I hope this helps!

-Christopher

[venkateshwarlu.t]

Thanks Christopher. But

[5092783.060721] Remounting filesystem read-only
[5095142.453497] Remounting filesystem read-only

what these numbers represent ? 

Can not get as like 7000 series Swiches ... 

To display the current status of the RAID devices, please run the following commands:

switch# show system internal raid | i i cmos|block | head line 5
RAID data from CMOS = 0xa5 0xf0
77888 blocks [2/2] [UU]
78400 blocks [2/2] [UU]
39424 blocks [2/2] [UU]
1802240 blocks [2/2] [UU]

Where x is the standby supervisor slot number:

switch# slot x show system internal raid | i i cmos|block | head line 5
RAID data from CMOS = 0xa5 0xf0
78016 blocks [2/2] [UU]
78528 blocks [2/2] [UU]
39744 blocks [2/2] [UU]
1760384 blocks [2/2] [UU]

Last number in the "RAID data from CMOS" lines indicate the number of disks failed:

0xf0 ==>> No failures reported
0xe1 ==>> Primary flash failed
0xd2 ==>> Alternate (or mirror) flash failed
0xc3 ==>> Both primary and alternate failed

We should also see [UU] in the respective entries for the flash to be correctly synced.

[Christopher Hart · Accepted solution]

Hello!

The numbers within square brackets (such as [5092783.060721]) to the left of each log message in the output of show system internal kernel messages are essentially a timestamp (more specifically, it's the amount of time in seconds since the switch booted up).

To the best of my knowledge, there is no way to get output similar to the show system internal raid output you are familiar with from Nexus 7000 series switches. Analyzing the output of show system internal kernel messages for "Remounting read-only" logs is the best way to verify that the RAID for the internal bootflash is in a healthy state on a Nexus 7700 series switch.

I hope this helps - thank you!

-Christopher

[venkateshwarlu.t]

Thank You So Much Christopher