Survivor Space is always full and causes Full GC

Hi, Gurus,
I got full GCs on the server today and when I used jstat to look at it, it quite surprised me that survivor space was always full.
Eden had about 40M free, Old Gen had about 1G free. Permant space looks fine. I don't see why there should be Full GC.
S0C S1C S0U S1U EC EU OC OU PC PU {color:#ff0000}YGC{color} YGCT {color:#ff0000}FGC{color} FGCT GCT
17024.0 17024.0 0.0 {color:#ff0000}17024.{color}0 136320.0 97397.6 2424448.0 983664.4 83760.0 50162.0 2389 141.766 {color:#ff0000}1182{color} 57.500 199.266
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
17024.0 17024.0 0.0 {color:#ff0000}17024.0{color} 136320.0 97479.5 2424448.0 983664.4 83760.0 50162.0 2389 141.766 {color:#ff0000}1182 {color}57.500 199.266
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
17024.0 17024.0 {color:#ff0000}17024.0{color} 0.0 136320.0 86847.5 2424448.0 1254066.8 83760.0 50181.5 2406 142.381 {color:#ff0000}1183 {color}57.547 199.928
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
17024.0 17024.0 0.0 {color:#ff0000}17024.0{color} 136320.0 63901.1 2424448.0 980688.6 83760.0 50194.9 2409 142.470 {color:#ff0000}1184 {color}57.629 200.099
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
17024.0 17024.0 0.0 {color:#ff0000}17024.0{color} 136320.0 63978.7 2424448.0 980688.6 83760.0 50194.9 2409 142.470 1184 57.629 200.099
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
17024.0 17024.0 0.0 {color:#ff0000}17024.0{color} 136320.0 64138.8 2424448.0 980688.6 83760.0 50194.9 2409 142.470 1184 57.629 200.099
GC setting is:
1.6.0_02-b05-x86_64/bin/java -showversion -verbose:gc -XX:CMSInitiatingOccupancyFraction=60 -XX:CMSIncrementalDutyCycle=50 -XX:CMSIncrementalDutyCycleMin=10 -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+UseCMSCompactAtFullCollection -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -Dsun.rmi.dgc.client.gcInterval=86400000 -Dsun.rmi.dgc.server.gcInterval=86400000 -Xms2534m -Xmx2534m -DLOG4J_WATCHDOG=true
I don't know why there was no "Full GC" in the log:
87827.250: [GC 287827.251: [ParNew: 153344K->17024K(153344K), 0.0325760 secs] 642111K->520423K(2577792K) icms_dc=10 , 0.0327100 secs]
287827.568: [GC 287827.568: [ParNew: 153344K->17024K(153344K), 0.0260580 secs] 656743K->532347K(2577792K) icms_dc=10 , 0.0261780 secs]
287827.823: [GC 287827.823: [ParNew: 153344K->15632K(153344K), 0.0273900 secs] 668667K->540848K(2577792K) icms_dc=10 , 0.0275110 secs]
287828.098: [GC 287828.098: [ParNew: 151952K->17024K(153344K), 0.0304150 secs] 677168K->555053K(2577792K) icms_dc=10 , 0.0305420 secs]
287828.403: [GC 287828.403: [ParNew: 153344K->17024K(153344K), 0.0305150 secs] 691373K->570859K(2577792K) icms_dc=10 , 0.0306520 secs]
287828.685: [GC 287828.685: [ParNew: 153344K->17024K(153344K), 0.0379710 secs] 707179K->585425K(2577792K) icms_dc=10 , 0.0381200 secs]
287828.985: [GC 287828.985: [ParNew: 153344K->17024K(153344K), 0.0431150 secs] 721745K->610830K(2577792K) icms_dc=10 , 0.0432430 secs]
287829.253: [GC 287829.253: [ParNew: 153344K->17024K(153344K), 0.0345560 secs] 747150K->629754K(2577792K) icms_dc=10 , 0.0346570 secs]
287829.551: [GC 287829.551: [ParNew: 153344K->17024K(153344K), 0.0345630 secs] 766074K->643360K(2577792K) icms_dc=10 , 0.0347040 secs]
287829.785: [GC 287829.785: [ParNew: 153344K->17024K(153344K), 0.0347640 secs] 779680K->657564K(2577792K) icms_dc=10 , 0.0348710 secs]
287830.046: [GC 287830.046: [ParNew: 153344K->17024K(153344K), 0.0347300 secs] 793884K->671947K(2577792K) icms_dc=10 , 0.0348460 secs]
287830.347: [GC 287830.347: [ParNew: 153344K->17024K(153344K), 0.0375390 secs] 808267K->689272K(2577792K) icms_dc=10 , 0.0376620 secs]
287835.620: [GC 287835.620: [ParNew: 153344K->16585K(153344K), 0.0295650 secs] 825592K->701839K(2577792K) icms_dc=10 , 0.0297360 secs]
287841.587: [GC 287841.587: [ParNew: 152905K->15178K(153344K), 0.0240180 secs] 838159K->709028K(2577792K) icms_dc=10 , 0.0241380 secs]
287962.309: [GC 287962.309: [ParNew: 151498K->17024K(153344K), 0.0829110 secs] 845348K->734092K(2577792K) icms_dc=10 , 0.0830450 secs]
288325.418: [GC 288325.418: [ParNew: 153344K->17024K(153344K), 0.2753590 secs] 869434K->754338K(2577792K) icms_dc=10 , 0.2754940 secs]
288383.372: [GC [1 CMS-initial-mark: 737314K(2424448K)] 815727K(2577792K), 0.0504460 secs]
288383.547: [GC 288383.547: [ParNew: 153344K->17024K(153344K), 0.0361790 secs] 890658K->758050K(2577792K) icms_dc=10 , 0.0363070 secs]
288383.800: [GC 288383.800: [ParNew: 153344K->17024K(153344K), 0.0351570 secs] 894370K->773090K(2577792K) icms_dc=10 , 0.0352870 secs]
288384.039: [GC 288384.039: [ParNew: 153344K->17024K(153344K), 0.0304930 secs] 909410K->784697K(2577792K) icms_dc=10 , 0.0306350 secs]
288384.323: [GC 288384.323: [ParNew: 153344K->17024K(153344K), 0.0317450 secs] 921017K->798864K(2577792K) icms_dc=10 , 0.0318700 secs]
288384.630: [GC 288384.630: [ParNew: 153344K->17024K(153344K), 0.0366800 secs] 935184K->815969K(2577792K) icms_dc=10 , 0.0368140 secs]
288384.852: [GC 288384.852: [ParNew: 153344K->17024K(153344K), 0.0337750 secs] 952289K->831548K(2577792K) icms_dc=10 , 0.0339080 secs]
288385.138: [GC 288385.138: [ParNew: 153344K->16444K(153344K), 0.0300460 secs] 967868K->843332K(2577792K) icms_dc=10 , 0.0301850 secs]
288385.403: [GC 288385.403: [ParNew: 152764K->17024K(153344K), 0.0319640 secs] 979652K->853758K(2577792K) icms_dc=10 , 0.0320770 secs]
288385.658: [GC 288385.658: [ParNew: 153344K->17024K(153344K), 0.0295970 secs] 990078K->865590K(2577792K) icms_dc=10 , 0.0297140 secs]
288385.947: [GC 288385.948: [ParNew: 153344K->17024K(153344K), 0.0352280 secs] 1001910K->881224K(2577792K) icms_dc=10 , 0.0353640 secs]
288386.228: [GC 288386.228: [ParNew: 153344K->17024K(153344K), 0.0358860 secs] 1017544K->897416K(2577792K) icms_dc=10 , 0.0360310 secs]
288386.522: [GC 288386.522: [ParNew: 153344K->17024K(153344K), 0.0505040 secs] 1033736K->920867K(2577792K) icms_dc=10 , 0.0506410 secs]
288386.807: [GC 288386.807: [ParNew: 153344K->17024K(153344K), 0.0356400 secs] 1057187K->939937K(2577792K) icms_dc=10 , 0.0358620 secs]
288387.088: [GC 288387.088: [ParNew: 153344K->17024K(153344K), 0.0347680 secs] 1076257K->955399K(2577792K) icms_dc=10 , 0.0348950 secs]
288387.329: [GC 288387.329: [ParNew: 153344K->17024K(153344K), 0.0330050 secs] 1091719K->969242K(2577792K) icms_dc=10 , 0.0331310 secs]
288387.570: [GC 288387.570: [ParNew: 153344K->17024K(153344K), 0.0357920 secs] 1105562K->982914K(2577792K) icms_dc=10 , 0.0359160 secs]
288387.868: [GC 288387.868: [ParNew: 153344K->17024K(153344K), 0.0367610 secs] 1119234K->998638K(2577792K) icms_dc=10 , 0.0368880 secs]
288388.512: [GC 288388.512: [ParNew: 153344K->16630K(153344K), 0.0362600 secs] 1134958K->1013366K(2577792K) icms_dc=12 , 0.0364030 secs]
288398.870: [GC 288398.870: [ParNew: 152950K->14088K(153344K), 0.0250260 secs] 1149686K->1022215K(2577792K) icms_dc=12 , 0.0251510 secs]
288434.572: [GC 288434.572: [ParNew: 150408K->17024K(153344K), 0.0519690 secs] 1158535K->1043752K(2577792K) icms_dc=12 , 0.0521010 secs]
288805.656: [GC 288805.656: [ParNew: 153344K->17024K(153344K), 0.2108850 secs] 858554K->744507K(2577792K) icms_dc=10 , 0.2110200 secs]
288999.265: [GC [1 CMS-initial-mark: 727483K(2424448K)] 806594K(2577792K), 0.0613950 secs]
289198.629: [GC 289198.629: [ParNew: 153340K->17024K(153344K), 0.2407550 secs] 565998K->436213K(2577792K) icms_dc=10 , 0.2408970 secs]
289394.326: [GC [1 CMS-initial-mark: 419189K(2424448K)] 498224K(2577792K), 0.0617040 secs]
289630.132: [GC 289630.132: [ParNew: 153344K->17024K(153344K), 0.2492610 secs] 565902K->436417K(2577792K) icms_dc=10 , 0.2494310 secs]
289798.632: [GC [1 CMS-initial-mark: 419393K(2424448K)] 497878K(2577792K), 0.0599100 secs]
290039.842: [GC 290039.843: [ParNew: 153344K->17024K(153344K), 0.2310620 secs] 565827K->435926K(2577792K) icms_dc=10 , 0.2312040 secs]
290210.826: [GC [1 CMS-initial-mark: 418902K(2424448K)] 498601K(2577792K), 0.0598820 secs]
290414.495: [GC 290414.495: [ParNew: 153344K->17024K(153344K), 0.2432180 secs] 565680K->435900K(2577792K) icms_dc=10 , 0.2433510 secs]
290644.238: [GC [1 CMS-initial-mark: 418876K(2424448K)] 498334K(2577792K), 0.0606010 secs]
291120.210: [GC 291120.210: [ParNew: 153344K->17024K(153344K), 0.2008300 secs] 565657K->435372K(2577792K) icms_dc=10 , 0.2009970 secs]
291164.186: [GC [1 CMS-initial-mark: 418348K(2424448K)] 496750K(2577792K), 0.0467970 secs]
291164.359: [GC 291164.359: [ParNew: 153344K->17024K(153344K), 0.0273010 secs] 571692K->437891K(2577792K) icms_dc=10 , 0.0274210 secs]
291164.605: [GC 291164.605: [ParNew: 153344K->17024K(153344K), 0.0372920 secs] 574211K->452665K(2577792K) icms_dc=10 , 0.0374300 secs]
291164.860: [GC 291164.860: [ParNew: 153344K->16640K(153344K), 0.0335340 secs] 588985K->464865K(2577792K) icms_dc=10 , 0.0336600 secs]
291165.153: [GC 291165.154: [ParNew: 152960K->17024K(153344K), 0.0331560 secs] 601185K->479410K(2577792K) icms_dc=10 , 0.0332850 secs]
Your help is greatly appreciated.
Jim

The "FGC" in the jstat output could include CMS actions? If yes, that answers the later half of the question.

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HT5675 This update, upon booting, has caused my disk space to fill up and my system freezes up. The same happens to my coworker's computer. We both watch the remaining disk space decrease and the "spinning rainbow appears" and we must restart. What do we

Software Update: Java for OS X 2013-002 1.0
This update, upon booting, has caused my disk space to fill up and my system freezes up. The same happens to my coworker's computer. We both watch the remaining disk space decrease and the "spinning rainbow appears" and we must restart. What do we do?

First, empty the Trash if you haven't already done so.
Use a tool such as OmniDiskSweeper (ODS) to explore your volume and find out what's taking up the space. You can delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one.
Proceed further only if the problem hasn't been solved.
ODS can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
Install ODS in the Applications folder as usual.
Triple-click the line of text below to select it, then copy the selected text to the Clipboard (command-C):sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
I don't recommend that you make a habit of doing this. Don't delete anything while running ODS as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means.
When you're done with ODS, quit it and also quit Terminal.

Survivor Space is always full and causes Full GC

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