topic Re: APIC-EM Backup File in Controllers

APIC-EM Backup File

ymeloch — Fri, 01 Mar 2019 12:40:46 GMT

Hey team,

Quick question about APIC-EM backup file.

Any idea why there's a duplicate of the APIC-EM backup file (in the controller server)?

Location #1:

/srv/grapevine/replicated-storage/backups/4960085a-9a16-11e7-bbd8-0025b500303f/backup_2017-09-15_13-09-16.backup

Location #2:

/mnt/gfs_block/backups/4960085a-9a16-11e7-bbd8-0025b500303f/backup_2017-09-15_13-09-16.backup

MD5 of both files:
- md5sum /srv/grapevine/replicated-storage/backups/4960085a-9a16-11e7-bbd8-0025b500303f/backup_2017-09-15_13-09-16.backup

d392725d7b30778a56fcf34ec3c1218e

md5sum /mnt/gfs_block/backups/4960085a-9a16-11e7-bbd8-0025b500303f/backup_2017-09-15_13-09-16.backup

d392725d7b30778a56fcf34ec3c1218e

Thanks!

Re: APIC-EM Backup File

ymeloch — Fri, 15 Sep 2017 14:51:14 GMT

Forgot to mention - APIC-EM Version 1.5.0.1368 (standalone, no HA/Cluster)

Re: APIC-EM Backup File

aradford — Fri, 15 Sep 2017 23:18:50 GMT

Longer story as to why, but essentially there is only one copy.

They are just different aliases to see the same content. In case you don't believe me try the following

as root, change dir into /svr/grapevine/replicated-storage

cd /srv/grapevine/replicated-storage

create a new file

> backups/fred

take a look at contents on /mnt/gfs_block/backups

ls -lrt /mnt/gfs_block/backups/

total 4

drwxr-xr-x 2 root root 4096 Aug 4 20:32 ded9a8f6-794f-11e7-a569-000c29ee367f

-rw-rr 2 root root 0 Sep 15 23:10 fred

You will see the file appears there too..

There is only one copy.

Re: APIC-EM Backup File

ymeloch — Mon, 18 Sep 2017 13:34:25 GMT

why shouldn't I believe you? 🙂

Thnks much!

Can you please elaborate on the reason behind it?

Re: APIC-EM Backup File

aradford — Tue, 19 Sep 2017 03:52:37 GMT

ok... here is the longer answer.

The filesystem used on APIC-EM is gluster file system.

You can see that a cluster filesystem "datastore" is created as 169.254.0.1/mnt/gfs_block

$ sudo gluster volume info
[sudo] password for grapevine:

Volume Name: datastore
Type: Distribute
Volume ID: b00947e7-bfbb-402a-9c84-33f696a566c8
Status: Started
Number of Bricks: 1
Transport-type: tcp
Bricks:

Brick1: 169.254.0.1:/mnt/gfs_block

This filesystem is mounted on /srv/grapevine/replicated-storage:

cat /etc/fstab

169.254.0.1:/datastore /srv/grapevine/replicated-storage glusterfs defaults,nobootwait,_netdev,fetch-attempts=10 0 0

/mnt/gfs_block is a direct reference to the gluster brick, where as /srv/grapevine is a reference to the filesystem mount (and the preferred method)

Adam

Re: APIC-EM Backup File

ymeloch — Thu, 28 Sep 2017 12:56:48 GMT

Thank you so much for the detailed explanation.

Much appreciated.