Dell EMC Unity: Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full

Resumen: Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full. For Unity, /tmp is only 56M in size.

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Instrucciones


ISSUE
Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full.
In Dell EMC Unity, /tmp is only 56M in size. So saving / copying / moving files to /tmp is not recommended.


CAUSE
This is working as designed.
In Unity, the /tmp file system is only used by the system for generating temporary status files which HA (for example) picks up to determine if the system is up.
If /tmp is full, these status files cannot be created, and HA determines that the system may be in a bad state. It then initiates a graceful reboot in an attempt to resolve this condition.
Since /tmp is a memory drive, it is cleared on reboot.


WORKAROUND
If you need to save or copy files or logs somewhere, use /cores/service since it has more space and is also the user "service" home dir (/cores/service = /home/service)

Información adicional

Please do NOT use /var/tmp directory to save any files either. Though this directory has much more space than /tmp, repeated use may still cause issue and this directory doesn't clear itself after reboot.

service@(none) spb:~> df -h
Filesystem         Size  Used Avail Use% Mounted on
/dev/mapper/eroot   11G  5.5G  4.8G  54% /
udev               744M  8.0K  744M   1% /dev
tmpfs              2.4G  204M  2.2G   9% /dev/shm
tmpfs              2.4G  239M  2.2G  10% /run
tmpfs              2.4G     0  2.4G   0% /sys/fs/cgroup
/dev/ram0           59M  2.2M   56M   4% /tmp       <<<<<<< DON'T use this
/dev/sda1          117M  5.7M  105M   6% /mnt/c4lx-cfg_msata
/dev/sda7          7.9G 1015M  6.5G  14% /cores     <<<<<<< Use this
/pramfs            122M   38M   85M  31% /pramfs
/dev/mirrora5       15G  1.1G   13G   8% /EMC/backend/service
/dev/c4nasdba2     3.5G  372M  3.0G  11% /EMC/backend/CEM
/dev/c4nasdba1    1013M   57M  905M   6% /nbsnas
/dev/c4loga2       4.7G  139M  4.3G   4% /EMC/backend/perf_stats
/dev/c4loga1       3.4G   95M  3.1G   3% /EMC/backend/log_shared
/dev/metricsluna1   16G  1.5G   14G  10% /EMC/backend/metricsluna1
/dev/c4fastvpa1    6.0G  144M  5.6G   3% /EMC/fastvp


10:17:08 service@(none) spb:~> pwd
/home/service
10:21:45 service@(none) spb:~> ll -h
total 208K
-rw-r--r-- 1 root root  44K Jun 23 11:07 svc_networkcheck.log
-rw-r--r-- 1 root root 164K Jun 23 11:07 svc_storagecheck.log

10:21:54 service@(none) spb:~> cd /cores/service
10:22:04 service@(none) spb:/cores/service> ll -h
total 208K
-rw-r--r-- 1 root root  44K Jun 23 11:07 svc_networkcheck.log
-rw-r--r-- 1 root root 164K Jun 23 11:07 svc_storagecheck.log

10:23:23 service@(none) spb:/cores/service> ll -h /home/service
lrwxrwxrwx 1 root root 14 May 10 09:14 /home/service -> /cores/service

Productos afectados

Dell Unity 300, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family

Productos

Dell EMC Unity Hybrid, Dell EMC UnityVSA Professional Edition/Unity Cloud Edition
Propiedades del artículo
Número del artículo: 000022433
Tipo de artículo: How To
Última modificación: 12 ago 2025
Versión:  6
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