RN516. Volume: System volume root's usage is 81%.

[tijgert]

I'm running an RN516 on OS 6.5.1 with 6x 6TB WD RED's.

Out of the blue I get a "Volume: System volume root's usage is 81%" error.

I'm not running *any* 3rd party apps and only use the unit as a file server at home.

The percentage went up to 88% once and went back down to 81% and it's hovering there so the unit keeps functioning, but something might give at some point and I need to **bleep** this in the bud as painlessly as possible.

I got this unit from a former colleague and as such it is not registered in my name and I cannot apply for support since I am no longer in contact with that person (I had to RMA the unit under warranty once and back then I got some Netgear techie to snoop inside my NAS remotely and he saw it was fubar, so I know what one could do for me). So I have no ticket number. All I get now is to look into the knowledge base (came up zip) and ask here. I hope some of you dear experts (winking at mr.mdgm) can help me out.

When I got this error I knew nothing about SSH, hell I didn't even know what SSH stood for. Now, I still don't (I'm guessing one of the S's  stands for Shell), but I did read up in here on SSH enabling and running commands to find the sore spot.

I'm still a real n00b with SSH and I am in need for a little push in the right direction, or even need to be taken by the hand... this once.

So here's what I did so far:

admin@nas516:/$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             10M  4.0K   10M   1% /dev
/dev/md0        4.0G  3.3G  452M  88% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G   16M  3.9G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs           3.9G     0  3.9G   0% /media
/dev/md/data-0   28T   26T  1.7T  95% /data
/dev/md/data-0   28T   26T  1.7T  95% /home
/dev/md/data-0   28T   26T  1.7T  95% /apps
tmpfs            50M     0   50M   0% /var/replicate/shm
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/home
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Backup
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Games
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Media
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Music
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Pictures
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Programs
/dev/md/data-0   28T   26T  1.7T  95% /var/ftp/Videos
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Backup
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Games
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Media
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Music
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Pictures
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Programs
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/data/Videos
/dev/md/data-0   28T   26T  1.7T  95% /run/nfs4/home

So I see that /dev/md0 is almost full (don't see RootFS, why is that?).

I then checked the inodes, because it seems that people do that (SSH N00b, don't know what it's for)

admin@nas516:/$ df -i
Filesystem      Inodes IUsed   IFree IUse% Mounted on
udev           1006093   510 1005583    1% /dev
/dev/md0             0     0       0     - /
tmpfs          1006709     1 1006708    1% /dev/shm
tmpfs          1006709   708 1006001    1% /run
tmpfs          1006709     4 1006705    1% /sys/fs/cgroup
tmpfs          1006709     1 1006708    1% /media
/dev/md/data-0       0     0       0     - /data
/dev/md/data-0       0     0       0     - /home
/dev/md/data-0       0     0       0     - /apps
tmpfs          1006709     7 1006702    1% /var/replicate/shm
/dev/md/data-0       0     0       0     - /var/ftp/home
/dev/md/data-0       0     0       0     - /var/ftp/Backup
/dev/md/data-0       0     0       0     - /var/ftp/Games
/dev/md/data-0       0     0       0     - /var/ftp/Media
/dev/md/data-0       0     0       0     - /var/ftp/Music
/dev/md/data-0       0     0       0     - /var/ftp/Pictures
/dev/md/data-0       0     0       0     - /var/ftp/Programs
/dev/md/data-0       0     0       0     - /var/ftp/Videos
/dev/md/data-0       0     0       0     - /run/nfs4/data/Backup
/dev/md/data-0       0     0       0     - /run/nfs4/data/Games
/dev/md/data-0       0     0       0     - /run/nfs4/data/Media
/dev/md/data-0       0     0       0     - /run/nfs4/data/Music
/dev/md/data-0       0     0       0     - /run/nfs4/data/Pictures
/dev/md/data-0       0     0       0     - /run/nfs4/data/Programs
/dev/md/data-0       0     0       0     - /run/nfs4/data/Videos
/dev/md/data-0       0     0       0     - /run/nfs4/home

I really don't know what I'm seeing here.

I then listed the folders like so:

admin@nas516:/dev$ du -hxm --max-depth=1 / |sort -h
du: cannot read directory `/etc/ssl/private': Permission denied
du: cannot read directory `/etc/frontview/.msmtp.queue': Permission denied
du: cannot read directory `/root': Permission denied
du: cannot read directory `/var/backups/md': Permission denied
du: cannot read directory `/var/log/apache2': Permission denied
du: cannot read directory `/var/log/mysql': Permission denied
du: cannot read directory `/var/spool/cron/crontabs': Permission denied
du: cannot read directory `/var/cache/ldconfig': Permission denied
du: cannot read directory `/var/cache/samba/msg': Permission denied
du: cannot read directory `/var/lib/nut': Permission denied
du: cannot read directory `/var/lib/samba/private/msg.sock': Permission denied
du: cannot read directory `/var/lib/connman/ethernet_28c68ed5d6f6_cable': Permission denied
du: cannot read directory `/var/lib/connman/ethernet_4494fc6e3766_cable': Permission denied
du: cannot read directory `/var/lib/connman/ethernet_4494fc6e3767_cable': Permission denied
du: cannot read directory `/var/lib/mysql': Permission denied
du: cannot read directory `/var/lib/php5': Permission denied
du: cannot read directory `/var/lib/sudo': Permission denied
0       /apps
0       /boot
0       /dev
0       /home
0       /media
0       /mnt
0       /proc
0       /root
0       /run
0       /selinux
0       /srv
0       /sys
1       /data
1       /lib64
1       /tmp
4       /lib32
7       /bin
8       /etc
8       /opt
10      /sbin
30      /frontview
43      /lib
289     /var
473     /usr
869     /

So var and usr seem the biggest and I started looking into them, and ofcourse the log folder.

admin@nas516:/var$ du -hxm --max-depth=1 . |sort -h
du: cannot read directory `./backups/md': Permission denied
du: cannot read directory `./log/apache2': Permission denied
du: cannot read directory `./log/mysql': Permission denied
du: cannot read directory `./spool/cron/crontabs': Permission denied
du: cannot read directory `./cache/ldconfig': Permission denied
du: cannot read directory `./cache/samba/msg': Permission denied
du: cannot read directory `./lib/nut': Permission denied
du: cannot read directory `./lib/samba/private/msg.sock': Permission denied
du: cannot read directory `./lib/connman/ethernet_28c68ed5d6f6_cable': Permission denied
du: cannot read directory `./lib/connman/ethernet_4494fc6e3766_cable': Permission denied
du: cannot read directory `./lib/connman/ethernet_4494fc6e3767_cable': Permission denied
du: cannot read directory `./lib/mysql': Permission denied
du: cannot read directory `./lib/php5': Permission denied
du: cannot read directory `./lib/sudo': Permission denied
0       ./agentx
0       ./cores
0       ./ftp
0       ./local
0       ./mail
0       ./opt
0       ./replicate
0       ./tmp
1       ./netatalk
1       ./nuuo
1       ./readydrop
1       ./spool
1       ./www
2       ./readynasd
36      ./log
46      ./lib
67      ./backups
141     ./cache
289     .
admin@nas516:/var$


admin@nas516:/var$ cd ./cache
admin@nas516:/var/cache$ du -hxm --max-depth=1 . |sort -h
du: cannot read directory `./ldconfig': Permission denied
du: cannot read directory `./samba/msg': Permission denied
0       ./apache2
0       ./dbconfig-common
0       ./forked-daapd
0       ./istat
0       ./ldconfig
0       ./man
1       ./samba
2       ./debconf
138     ./apt
141     .
admin@nas516:/var/cache$ cd ./apt
admin@nas516:/var/cache/apt$ du -hxm --max-depth=1 . |sort -h
102     ./archives
138     .
admin@nas516:/var/cache/apt$ cd ./archives
admin@nas516:/var/cache/apt/archives$ du -hxm --max-depth=1 . |sort -h
0       ./partial
102     .


admin@nas516:/var/log$ du -ah
0       ./news/news.crit
0       ./news/news.err
0       ./news/news.notice
0       ./news
4.0K    ./apt/term.log.12.gz
4.0K    ./apt/term.log.11.gz
4.0K    ./apt/term.log.10.gz
4.0K    ./apt/term.log.9.gz
4.0K    ./apt/term.log.8.gz
4.0K    ./apt/term.log.7.gz
4.0K    ./apt/term.log.6.gz
4.0K    ./apt/term.log.5.gz
4.0K    ./apt/term.log.4.gz
4.0K    ./apt/term.log.3.gz
4.0K    ./apt/term.log.2.gz
0       ./apt/term.log
4.0K    ./apt/term.log.1.gz
4.0K    ./apt/history.log.12.gz
4.0K    ./apt/history.log.11.gz
4.0K    ./apt/history.log.10.gz
4.0K    ./apt/history.log.9.gz
4.0K    ./apt/history.log.8.gz
4.0K    ./apt/history.log.7.gz
4.0K    ./apt/history.log.6.gz
4.0K    ./apt/history.log.5.gz
4.0K    ./apt/history.log.4.gz
4.0K    ./apt/history.log.3.gz
4.0K    ./apt/history.log.2.gz
0       ./apt/history.log
4.0K    ./apt/history.log.1.gz
96K     ./apt
0       ./fsck
4.0K    ./frontview/initrd.log
4.0K    ./frontview/backup/status_backup_000
4.0K    ./frontview/backup
164K    ./frontview/error.log
124K    ./frontview/http-error.log
0       ./frontview/ssl_access.log
120K    ./frontview/http-access.log
784K    ./frontview/status.log
328K    ./frontview/msmtp.log
0       ./frontview/.managed
100K    ./frontview/cgi.log
0       ./frontview/.registered
1.9M    ./frontview/ssl_access.log.old
20K     ./frontview/msmtp.queue.log
3.5M    ./frontview
8.0M    ./journal/0e422faf8bd745e3a9c25b12ace37072/system@bfd79e7095da41d79a5603be6e48c6b4-0000000000557878-00053a66f0a25aca.journal
7.9M    ./journal/0e422faf8bd745e3a9c25b12ace37072/system@bfd79e7095da41d79a5603be6e48c6b4-0000000000559f1d-00053a8fff4acb2c.journal
8.0M    ./journal/0e422faf8bd745e3a9c25b12ace37072/system@bfd79e7095da41d79a5603be6e48c6b4-000000000055c647-00053ab90b994927.journal
4.6M    ./journal/0e422faf8bd745e3a9c25b12ace37072/system.journal
29M     ./journal/0e422faf8bd745e3a9c25b12ace37072
29M     ./journal
160K    ./samba/log.nmbd
516K    ./samba/log.smbd.old
132K    ./samba/log.smbd
808K    ./samba
du: cannot read directory `./apache2': Permission denied
0       ./apache2
248K    ./readynasd/event_push.log
228K    ./readynasd/fwbroker.log
632K    ./readynasd/event_push.log.old
4.0K    ./readynasd/ads.log
4.0K    ./readynasd/install_debpkg.log
1.1M    ./readynasd
132K    ./netatalk.log
4.0K    ./LeafP2P.log
40K     ./proftpd.log
du: cannot read directory `./mysql': Permission denied
0       ./mysql
0       ./mysql.err
4.0K    ./readydropd.log
4.0K    ./dbbroker.log
4.0K    ./dbconfig-common/dbc.log
4.0K    ./dbconfig-common
16K     ./lastlog
0       ./faillog
4.0K    ./dpkg.log.12.gz
4.0K    ./dpkg.log.11.gz
4.0K    ./dpkg.log.10.gz
4.0K    ./dpkg.log.9.gz
4.0K    ./dpkg.log.8.gz
4.0K    ./dpkg.log.7.gz
4.0K    ./dpkg.log.6.gz
4.0K    ./dpkg.log.5.gz
4.0K    ./dpkg.log.4.gz
4.0K    ./dpkg.log.3.gz
4.0K    ./dpkg.log.2.gz
4.0K    ./dpkg.log.1
32K     ./dpkg.log
4.0K    ./wtmp.1
12K     ./wtmp
0       ./btmp.1
0       ./btmp
16K     ./dmesg.4.gz
16K     ./dmesg.3.gz
16K     ./dmesg.2.gz
16K     ./dmesg.1.gz
48K     ./dmesg.0
64K     ./dmesg
824K    ./rsyslog.log
4.0K    ./alternatives.log.3.gz
4.0K    ./alternatives.log.2.gz
4.0K    ./alternatives.log.1
0       ./alternatives.log
1.4M    ./rsyslog.log.old
4.0K    ./mysql.log.7.gz
4.0K    ./mysql.log.6.gz
4.0K    ./mysql.log.5.gz
4.0K    ./mysql.log.4.gz
4.0K    ./mysql.log.3.gz
4.0K    ./mysql.log.2.gz
0       ./mysql.log
4.0K    ./mysql.log.1.gz
37M     .
admin@nas516:/var/log$

So log has nothing big in there it seems and the other two looked the same. I think.

admin@nas516:/var$ ls -al
total 24
drwxr-xr-x 1 root  root   202 Aug 16 00:34 .
drwxr-xr-x 1 root  root   302 Aug 24 17:35 ..
drwxr-xr-x 1 root  root     0 Mar 17  2014 agentx
drwxr-xr-x 1 root  root   734 Aug 24 04:20 backups
drwxr-xr-x 1 root  root   130 Jun 17 00:17 cache
drwxr-xr-x 1 root  root     0 Aug  1  2013 cores
drwxr-xr-x 1 guest guest   94 Aug 24 19:13 ftp
drwxr-xr-x 1 root  root   326 Aug 16 00:34 lib
drwxrwsr-x 1 root  staff    0 May 21  2012 local
lrwxrwxrwx 1 root  root     9 Aug 16 00:34 lock -> /run/lock
drwxr-xr-x 1 root  root  1192 Aug 24 19:13 log
drwxrwsr-x 1 root  mail     0 Jun  4  2012 mail
drwxr-xr-x 1 root  root    76 Jun  1 01:40 netatalk
drwxr-xr-x 1 root  root   186 Aug 16 00:07 nuuo
drwxr-xr-x 1 root  root     0 Jun  4  2012 opt
drwxr-xr-x 1 admin admin   38 Dec  9  2014 readydrop
drwxr-xr-x 1 root  root   298 Aug 24 21:46 readynasd
drwxr-xr-x 1 root  root     6 Aug 31  2014 replicate
lrwxrwxrwx 1 root  root     6 Aug 16 00:34 run -> ../run
drwxr-xr-x 1 root  root    46 Aug 16 00:33 spool
drwxrwxrwt 1 root  root     0 May 21  2012 tmp
drwxr-xr-x 1 root  root    20 Aug 16 00:34 www
admin@nas516:/var$ cd /log
-bash: cd: /log: No such file or directory
admin@nas516:/var$ cd log
admin@nas516:/var/log$ ls -al
total 2408
drwxr-xr-x 1 root  root     1192 Aug 24 19:13 .
drwxr-xr-x 1 root  root      202 Aug 16 00:34 ..
-rw-r--r-- 1 root  root        0 Aug 16 06:25 alternatives.log
-rw-r--r-- 1 root  root      358 Aug 16 00:38 alternatives.log.1
-rw-r--r-- 1 root  root      133 Dec  9  2014 alternatives.log.2.gz
-rw-r--r-- 1 root  root      600 Sep  3  2014 alternatives.log.3.gz
drwxr-x--- 1 root  adm      3482 Aug 21 06:25 apache2
drwxr-xr-x 1 root  root      746 Aug 16 06:25 apt
-rw------- 1 root  utmp        0 Aug  1 06:25 btmp
-rw------- 1 root  utmp        0 Jul  1 06:25 btmp.1
-rw-r--r-- 1 root  root      781 Aug 24 19:13 dbbroker.log
drwxr-xr-x 1 root  root       14 Sep  3  2014 dbconfig-common
-rw-r--r-- 1 root  adm     61591 Aug 24 19:13 dmesg
-rw-r--r-- 1 root  adm     61591 Aug 24 17:35 dmesg.0
-rw-r--r-- 1 root  adm     15260 Aug 16 00:34 dmesg.1.gz
-rw-r--r-- 1 root  adm     12320 Jul 20 17:50 dmesg.2.gz
-rw-r--r-- 1 root  adm     12317 Jan 16  2016 dmesg.3.gz
-rw-r--r-- 1 root  adm     12330 Jan  7  2016 dmesg.4.gz
-rw-r--r-- 1 root  root    28829 Aug 24 19:14 dpkg.log
-rw-r--r-- 1 root  root     2371 Jul 31 17:52 dpkg.log.1
-rw-r--r-- 1 root  root      993 Oct 31  2015 dpkg.log.10.gz
-rw-r--r-- 1 root  root      309 Sep 30  2015 dpkg.log.11.gz
-rw-r--r-- 1 root  root      320 Aug 31  2015 dpkg.log.12.gz
-rw-r--r-- 1 root  root      153 Jun 30 18:03 dpkg.log.2.gz
-rw-r--r-- 1 root  root      155 May 31 18:03 dpkg.log.3.gz
-rw-r--r-- 1 root  root      289 Apr 30 18:05 dpkg.log.4.gz
-rw-r--r-- 1 root  root      453 Mar 31 18:02 dpkg.log.5.gz
-rw-r--r-- 1 root  root      151 Feb 29 17:02 dpkg.log.6.gz
-rw-r--r-- 1 root  root      295 Jan 31  2016 dpkg.log.7.gz
-rw-r--r-- 1 root  root      489 Dec 31  2015 dpkg.log.8.gz
-rw-r--r-- 1 root  root      362 Nov 30  2015 dpkg.log.9.gz
-rw-r--r-- 1 root  root        0 Dec  9  2014 faillog
drwxr-xr-x 1 admin admin     292 Jul 12  2012 frontview
drwxr-xr-x 1 root  root        0 Oct 14  2013 fsck
drwxr-xr-x 1 root  root       64 Jun 30  2012 journal
-rw-r--r-- 1 root  root    28908 Aug 25 00:55 lastlog
-rw-r--r-- 1 root  root     3167 Aug 31  2014 LeafP2P.log
drwxr-s--- 1 mysql adm         0 Aug 30  2014 mysql
-rw-r----- 1 mysql adm         0 Aug 30  2014 mysql.err
-rw-r----- 1 mysql adm         0 Aug 24 06:25 mysql.log
-rw-r----- 1 mysql adm        20 Aug 23 06:25 mysql.log.1.gz
-rw-r----- 1 mysql adm        20 Aug 22 06:25 mysql.log.2.gz
-rw-r----- 1 mysql adm        20 Aug 21 06:25 mysql.log.3.gz
-rw-r----- 1 mysql adm        20 Aug 20 06:25 mysql.log.4.gz
-rw-r----- 1 mysql adm        20 Aug 19 06:25 mysql.log.5.gz
-rw-r----- 1 mysql adm        20 Aug 18 06:25 mysql.log.6.gz
-rw-r----- 1 mysql adm        20 Aug 17 06:25 mysql.log.7.gz
-rw-r--r-- 1 root  root   135058 Dec  7  2014 netatalk.log
drwxr-sr-x 1 news  news       56 Jun  8  2012 news
-rw-r----- 1 root  root    41577 Aug 24 19:13 proftpd.log
-rw-r--r-- 1 root  root       76 Dec  9  2014 readydropd.log
drwxr-xr-x 1 admin admin     138 Aug 15 23:59 readynasd
-rw-r----- 1 root  adm    298662 Aug 25 00:59 rsyslog.log
-rw-r--r-- 1 root  root  1610553 Aug 24 19:32 rsyslog.log.old
drwxr-xr-x 1 root  root       56 Aug 23 19:24 samba
-rw-rw-r-- 1 root  utmp    12288 Aug 25 00:55 wtmp
-rw-rw-r-- 1 root  utmp     3456 Jul 20 17:51 wtmp.1

admin@nas516:/usr$ ls -al
total 16
drwxr-xr-x 1 root root    80 Jun 16 14:48 .
drwxr-xr-x 1 root root   302 Aug 24 17:35 ..
drwxr-xr-x 1 root root  9240 Aug 16 00:37 bin
drwxr-xr-x 1 root root     0 May 21  2012 games
drwxr-xr-x 1 root root    44 Apr 21  2014 include
drwxr-xr-x 1 root root  3990 Aug 16 00:37 lib
drwxr-xr-x 1 root root   102 Dec  9  2014 lib32
drwxrwsr-x 1 root staff   72 Aug 16 00:33 local
drwxr-xr-x 1 root root  2584 Aug 16 00:33 sbin
drwxr-xr-x 1 root root  1020 Feb 18  2016 share
drwxr-xr-x 1 root root     0 May 21  2012 src

[tijgert]

(too many charachters to post the listing of admin@nas516:/usr/bin$ )

So now I'm stumped. Where do I look, I can't seem to find a large file anywhere.

I have the log files available for anyone who wants to see them.

[StephenB]

If you purchased new between 1 June 2014 and 31 May 2016, then you have lifetime (free) chat support.

I guess you could alternatively try deleting logs.

Your data volume is quite full - well above Netgear's recommendation of 80%.  That could cause issues with volume maintenance functions (scrub, balance, etc).  Since btrfs uses the same free space pool for metadata and data, it needs more free space than ext.

[mdgm-ntgr]

You're logged in as the admin user not the root user. du can't calculate the space used by files the user you are logged in as can't access.

du isn't designed for BTRFS but it is useful for getting a rough indication of what's using up the space.

My guess would be that there is a huge MySQL database under /var/lib/mysql possibly from an app.

[tijgert]

80% sounds like a nice goal, but not if the remaining 20% turns out to be 5.6TB. That's just silly.

I only log into the system as admin. I have a personal account but never ever use it. What could cause a database blowup like that? And how can I see it and subsequently kill it if I can't see it as the only user that's active?
Can I just erase a database anyway?

I was contemplating just reinstalling the OS in place, but I read I need space for that. How much do I need? Can I then erase anything at random to create the space? (The installed OS doesn't have to work anymore, I just need space).

Obviously I just want that crazy big file to die off, ik I can find it.

[mdgm-ntgr]

You need to login to SSH as the root user (the password is set to be the same as the one for the admin user). Then you can see what's filling the root volume whether it be a huge database or log file or something else and you can consider the next steps.

[tijgert]

I tried logging in as the root user as well and did the same snooping around looking for large files.

I'm afraid that Monkey See Monkey Do apparantly does not help me here as I was unsuccesful.

I did my best but it seems that after numerous attempts my SSH skills or lack thereof are still hindering me.

I am sincerely and respectfully asking for a knowledgeable helping hand to fix this.

If any Netgear techie could remotely access the NAS and see where the problem is I would be greatly appreciative, also if I could be pointed to how it was fixed so I may learn from it.

[mdgm-ntgr]

Just because a data volume is bigger that doesn't mean it's suddenly a good idea to fill it ridiculously full percentage wise.

[tijgert]

Understood and it is being worked on.

I didn't mean to sound disrespectfull, I'm just trying to understand the logic behind >5TB of free space being insufficient for the OS.

[mdgm-ntgr]

You have let your data volume get even more full.It's 97% full. You should be freeing up space not filling it more.

MySQL was storing data on the root volume. I moved it to the data volume.

[mdgm-ntgr]

You have let your data volume get even more full.It's 97% full. You should be freeing up space not filling it more.

MySQL was storing data on the root volume. I moved it to the data volume.

[tijgert]

I appreciate the help!
I still don't understand why MySQL would do this. Is it related to overfilling the data volume?

It'll be a few days before I can get to the NAS and am able to move a large amount of files from there. It is being worked on, I'm just abroad right now and cannot physically put an empty drive in my Sata dock...

[mdgm-ntgr]

No. MySQL storing data on the 4GB root volume is a separate issue.