New snapshot on Unifi AC Pro and Overlay partition

Installing and Using OpenWrt
1

Hello all,

I installed recent master snapshot on a Unifi AC Pro but something seems fishy with regards to the Overlay partition. TBH, I am quite useless with anything filesystem/partition related so the fishiness could just be my lack of knowledge but 320k seems a bit low. Am I wrong?

root@uap-ac-pro:~# ubus call system board
{
        "kernel": "5.15.80",
        "hostname": "uap-ac-pro",
        "system": "Qualcomm Atheros QCA956X ver 1 rev 0",
        "model": "Ubiquiti UniFi AC Pro",
        "board_name": "ubnt,unifiac-pro",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "SNAPSHOT",
                "revision": "r21436-a75a798162",
                "target": "ath79/generic",
                "description": "OpenWrt SNAPSHOT r21436-a75a798162"
        }
}

root@uap-ac-pro:~# df -h 
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 5.0M      5.0M         0 100% /rom
tmpfs                    59.5M    968.0K     58.6M   2% /tmp
/dev/mtdblock5          320.0K    232.0K     88.0K  73% /overlay
overlayfs:/overlay      320.0K    232.0K     88.0K  73% /
tmpfs                   512.0K         0    512.0K   0% /dev

root@uap-ac-pro:~# uptime
 11:25:44 up 3 days, 1 min,  load average: 0.00, 0.00, 0.00
2

Judging from the boot log on the Wiki (https://openwrt.org/toh/ubiquiti/unifiac), the "firmware" partition uses about 8MiB of the 16MiB. Another 8MiB are for a partition called "ubnt-airos", it looks like a dual-image device?
Thus, 320k of free space is about right.

1 Like
3

@andyboeh thanks for the reply and you very well could be right. However, I flashed on older snapshot I had from back in Feb and this is what it shows

root@uap-ac-pro:~# ubus call system board
{
        "kernel": "5.10.100",
        "hostname": "uap-ac-pro",
        "system": "Qualcomm Atheros QCA956X ver 1 rev 0",
        "model": "Ubiquiti UniFi AC Pro",
        "board_name": "ubnt,unifiac-pro",
        "rootfs_type": "squashfs",
        "release": {
                "distribution": "OpenWrt",
                "version": "SNAPSHOT",
                "revision": "r19000-9c335accfe",
                "target": "ath79/generic",
                "description": "OpenWrt SNAPSHOT r19000-9c335accfe"
        }
}

root@uap-ac-pro:~# df -h 
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 4.3M      4.3M         0 100% /rom
tmpfs                    59.7M      1.1M     58.6M   2% /tmp
/dev/mtdblock5            1.3M    564.0K    716.0K  44% /overlay
overlayfs:/overlay        1.3M    564.0K    716.0K  44% /
tmpfs                   512.0K         0    512.0K   0% /dev

I guess it could be the bump in kernel as well.

4

The kernel was updated from 5.10 to 5.15 and I don't know if the same packages are installed or if anything has grown in size. The root partition has definitely increased by 700k between the two snapshots.

1 Like