HI We see the below error in logs and DEV portal doesnt load. what is the cause ? there is space in server .

We run 62 sp2 on WAS 7 and OS Solaris.

2016-03-31
08:21:24,432 [    WebContainer : 4]
[  STANDARD] [    MLRCORE:01.01.02] (ler.FilesystemCompilationSaver)
ERROR ftwdsdbg2g31.r1-core.r1.aig.net| Proprietary information hidden 9110282 - Problem saving Java source
file to filesystem

1. java.io.IOException: No space left on
   device

2016-03-31
09:23:50,752 [mlr_prweb,maxpri=10]] [
STANDARD] [                    ]
(   mgmt.base.FilesystemStorage) ERROR   - Filesystem serialization failed for
requestor: H92D64B045DD7F4F73E708D703FA354A0, thread: STANDARD, page:
LossReportList

1. java.io.IOException: No space left on
   device

2016-03-31
09:25:45,094 [mlr_prweb,maxpri=10]] [
STANDARD] [                    ]
(          internal.async.Agent) INFO    - System date: Thu Mar 31 09:25:45 CDT 2016
Total memory: 1,503,068,160 Free memory: 650,313,168 Requestor Count: 13 Shared
Pages memory usage: 0%

2016-03-31
09:28:51,420 [mlr_prweb,maxpri=10]] [
STANDARD] [                    ]
(   mgmt.base.FilesystemStorage)
ERROR   - Error
restoring data for requestor: H17035D295C257633AC6D80172EE1CBF1, thread:
STANDARD

1. java.io.EOFException

016-03-31
09:39:51,661 [mlr_prweb,maxpri=10]] [
STANDARD] [                    ]
(   mgmt.base.FilesystemStorage) ERROR   - Filesystem serialization failed for requestor:
H92D64B045DD7F4F73E708D703FA354A0, thread: STANDARD, page: MyOpenItems

1. java.io.IOException: No space left on
   device

        at
java.io.FileOutputStream.writeBytes(Native Method)

        at
java.io.FileOutputStream.write(FileOutputStream.java:282)

        at
com.pega.pegarules.pub.util.PROutputStream.write(PROutputStream.java:135)

            at
java.io.ObjectOutputStream$BlockDataOutputSt