Try to update  JunOS SRX240H from 11.4R7.5 to 11.4R10.3, but found storage space is not enough and to hold the JUNOS even after request to clean the storage on the device. There is one way to use external USB key to do upgrade, as described from previous post Upgrade Juniper JUNOS on SRX using USB Storage

However, this time the storage is only short about 15M to hold this 11.4R10.3 package. There should have a better way to deal with it.

root@fw-2> show system storage 
node0:
————————————————————————–
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/da0s1a             292M       142M       127M       53%  /
devfs                   1.0K       1.0K         0B      100%  /dev
/dev/md0                368M       368M         0B      100%  /junos
/cf                     292M       142M       127M       53%  /junos/cf
devfs                   1.0K       1.0K         0B      100%  /junos/dev/
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/bo0s3e              24M       154K        22M        1%  /config
/dev/bo0s3f             342M       161M       154M       51%  /cf/var
/dev/md1                168M        18M       137M       12%  /mfs
/cf/var/jail            342M       161M       154M       51%  /jail/var
/cf/var/log             342M       161M       154M       51%  /jail/var/log
devfs                   1.0K       1.0K         0B      100%  /jail/dev
/dev/md2                 39M       4.0K        36M        0%  /mfs/var/run/utm
/dev/md3                1.8M       4.0K       1.7M        0%  /jail/mfs
node1:
————————————————————————–
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/da0s1a             293M       142M       127M       53%  /
devfs                   1.0K       1.0K         0B      100%  /dev
/dev/md0                368M       368M         0B      100%  /junos
/cf                     293M       142M       127M       53%  /junos/cf
devfs                   1.0K       1.0K         0B      100%  /junos/dev/
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/bo0s3e              24M       160K        22M        1%  /config
/dev/bo0s3f             342M       187M       129M       59%  /cf/var
/dev/md1                168M        18M       137M       12%  /mfs
/cf/var/jail            342M       187M       129M       59%  /jail/var
/cf/var/log             342M       187M       129M       59%  /jail/var/log
devfs                   1.0K       1.0K         0B      100%  /jail/dev
/dev/md2                 39M       4.0K        36M        0%  /mfs/var/run/utm
/dev/md3                1.8M       4.0K       1.7M        0%  /jail/mfs
I am wondering why Node1 is 30M less free space than Node0. 

Using find command we could find out which file is having bigger size.

root@fw-2% find . -type f -size +10000 -exec ls -lh {} ; 
-rw-r–r–  1 930  929   134M Mar  1  2013 ./cf/packages/junos-11.4R7.5-domestic
-rw-r—–  1 root  wheel   5.3M Jan 19 14:08 ./cf/var/db/idpd/db/secdb_02.db
-rw-r—–  1 root  wheel   6.6M Jan 19 14:08 ./cf/var/db/idpd/db/secdb_03.db
-rw-r—–  1 root  wheel    54M Jan 19 14:09 ./cf/var/db/idpd/db/secdb_06.db
-rw-r–r–  1 root  wheel    20M Feb 27  2013 ./cf/var/db/idpd/sec-download/SignatureUpdate.xml
-rwxr-xr-x  1 root  wheel    22M Feb 16 19:08 ./cf/var/db/idpd/nsm-download/SignatureUpdate.xml
-rwxr-xr-x  1 root  wheel    29M Sep 22 13:55 ./cf/var/db/ai_cache/dfa_group_cache.db
-r-xr-xr-x  1 root  wheel   5.2M Mar  1  2013 ./jail/html/dynamic-vpn/client/jam/InstallerComponentSRX.exe
-rw-r—–  1 root  config    14M Feb 22 01:54 ./mfs/var/run/db/schema.db
-rw-r—–  1 root  wheel    10M Feb 22 01:55 ./mfs/var/sdb/log.0000000001
-r–r–r–  1 root  wheel   6.5M Mar  1  2013 ./usr/lib/dd/libjkernel-dd.so
-r-xr-xr-x  1 root  wheel    13M Mar  1  2013 ./usr/sbin/authd
-r-xr-xr-x  1 root  wheel   6.0M Mar  1  2013 ./usr/sbin/chassisd
-r-xr-xr-x  1 root  wheel    27M Mar  1  2013 ./usr/sbin/flowd_octeon
-r-xr-xr-x  1 root  wheel    34M Mar  1  2013 ./usr/sbin/flowd_octeon_hm
-r-xr-xr-x  1 root  wheel   5.5M Mar  1  2013 ./usr/sbin/kmd
-r-xr-xr-x  1 root  wheel    13M Mar  1  2013 ./usr/sbin/rpd
Looks like there is cache file ai_cache/dfa_group_cache.db on Node 1 but not on node 0 which is primary. I do not think it is critical for the system. After delete this file, node1 this time is ok to do upgrade now. 
root@fw-mex1-2> show system storage      
node0:
————————————————————————–
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/da0s1a             292M       142M       127M       53%  /
devfs                   1.0K       1.0K         0B      100%  /dev
/dev/md0                368M       368M         0B      100%  /junos
/cf                     292M       142M       127M       53%  /junos/cf
devfs                   1.0K       1.0K         0B      100%  /junos/dev/
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/bo0s3e              24M       154K        22M        1%  /config
/dev/bo0s3f             342M       161M       154M       51%  /cf/var
/dev/md1                168M        18M       137M       12%  /mfs
/cf/var/jail            342M       161M       154M       51%  /jail/var
/cf/var/log             342M       161M       154M       51%  /jail/var/log
devfs                   1.0K       1.0K         0B      100%  /jail/dev
/dev/md2                 39M       4.0K        36M        0%  /mfs/var/run/utm
/dev/md3                1.8M       4.0K       1.7M        0%  /jail/mfs
node1:
————————————————————————–
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/da0s1a             293M       142M       127M       53%  /
devfs                   1.0K       1.0K         0B      100%  /dev
/dev/md0                368M       368M         0B      100%  /junos
/cf                     293M       142M       127M       53%  /junos/cf
devfs                   1.0K       1.0K         0B      100%  /junos/dev/
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/bo0s3e              24M       160K        22M        1%  /config
/dev/bo0s3f             342M       158M       157M       50%  /cf/var
/dev/md1                168M        18M       137M       12%  /mfs
/cf/var/jail            342M       158M       157M       50%  /jail/var
/cf/var/log             342M       158M       157M       50%  /jail/var/log
devfs                   1.0K       1.0K         0B      100%  /jail/dev
/dev/md2                 39M       4.0K        36M        0%  /mfs/var/run/utm
/dev/md3                1.8M       4.0K       1.7M        0%  /jail/mfs

By Jon

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