Garbage Collector pausing my Server for MINUTES at a time

Garbage Collection pauses are really crippling my server. Here is a grep of Full GCs from the log file. (The lines following each Full GC have a timestamp, yymmdd:hhmmss.sss)
[Full GC 876186K->169083K(222400K), 28.4152794 secs]
011120:004809.413:
[Full GC 883850K->214246K(259008K), 68.2294388 secs]
011120:033449.558: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 209.2 MB/900.0 MB (Free: 43.7 MB, Allocated: 252.9 MB)
[Full GC 881484K->300898K(347200K), 73.3787317 secs]
011120:045927.680: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 293.8 MB/900.0 MB (Free: 45.2 MB, Allocated: 339.1 MB)
[Full GC 886225K->269194K(317824K), 79.8212023 secs]
011120:055800.166: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 262.9 MB/900.0 MB (Free: 47.5 MB, Allocated: 310.4 MB)
[Full GC 890405K->261774K(338112K), 104.6192760 secs]
011120:064350.312: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 255.6 MB/900.0 MB (Free: 74.5 MB, Allocated: 330.2 MB)
[Full GC 893451K->306762K(361024K), 134.4052782 secs]
011120:073523.335: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 299.6 MB/900.0 MB (Free: 53.0 MB, Allocated: 352.6 MB)
[Full GC 896034K->286275K(350016K), 103.4689894 secs]
011120:081636.710: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 279.6 MB/900.0 MB (Free: 62.2 MB, Allocated: 341.8 MB)
[Full GC 882755K->260923K(310272K), 129.6787672 secs]
011120:093812.612: *** RECLAIMED MemoryManager( Idle ) - Memory Usage: 254.8 MB/900.0 MB (Free: 48.2 MB, Allocated: 303.0 MB)
You can see that between 12:48am and 9:38am, the Server is pausing for a combined total of TWELVE MINUTES! Often for 2 whole minutes at a time, during which the Server is completely unresponsive.
I have read Sun's GC tuning guide at http://java.sun.com/docs/hotspot/gc/index.html but it is not much help:
It says "Pauses can be minimized by using a small young generation and incremental collection, at the expense of throughput."
Well, I AM using incremental collection, and the young generation is the default size, which is quite small I believe. (32 MB max?)
It also says "Unless you have problems with pauses, try granting as much memory as possible to the JVM. The default size (64MB) is often too small."
Well I DO have problems with pauses, but I HAVE to allocate a ton of memory. The Server must support hundreds of simultaneous users, each with hundreds of K's of personal, dynamic, temporary data.
It also says "Unless you find problems with excessive major collection or pause times, grant plenty of memory to the young generation. The default MaxNewSize (32MB) is generally too small."
I AM having problems with excessive major collections and pause times, so according to this I should NOT grant more memory to young generation (eden).
What am I left with? Nothing! I am totally out to lunch here. The box this is running on is a dual P3-600 with a gig of RAM and Red Hat 6.2, with Sun JRE 1.3.1_02. My startup command line options are:
java -server -Xincgc -verbose:gc -Xms256M -Xmx900M
What should I do? The Tuning guide essentially says to screw around with generation sizes, but none of its specific tips seem to apply to me! This is a production server and I am worried about making things worse by playing around, so I was hoping someone out there might have some experience with this and concrete advice before I just start messing around with the memory map. Should I increase the young generation size? Decrease it? Something else altogether? HELP!

With default settings, I am getting horrible performance, under peak load, 25%-50% of server time is being spent with GC, approx. 11,000 minor GCs per hour! And a Full GC every hour or two which takes up several minutes. On average, I am losing 13.09 minutes per hour due to minor GC, and 54.5 seconds to major GC.
I tried your settings, Chuck, and they seemed to be working beautifully at first... minor GCs were now occuring once every few minutes for a couple seconds, instead of 3 times per second for a tenth of a second. Minor GC were now taking 1.06 minutes per hour instead of 13.09, more than a 1300% improvement!
HOWEVER...
After 7 hours, the Server started getting REALLY slow for no apparent reason. It seemed almost as if reading from sockets was suddenly becoming extremely time intensive. Then I got a HUGE minor GC that took 25.6 seconds. [GC 507410K->478034K(551296K), 25.6328459 secs], then a couple minutes later, the Server CRASHED with this output:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x40573aa7
Function name=malloc
Library=/lib/libc.so.6
Current Java thread:
Dynamic libraries:
011121:231738.194: Search ( pizzala, lzh ) returned 50 results (28 ms)
08048000-0804c000 r-xp 00000000 08:06 376904 /usr/local/java/jre1.3.1_01/bin/i386/native_threads/java
0804c000-0804d000 rw-p 00003000 08:06 376904 /usr/local/java/jre1.3.1_01/bin/i386/native_threads/java
40000000-40013000 r-xp 00000000 08:06 311298 /lib/ld-2.1.3.so
40013000-40014000 rw-p 00012000 08:06 311298 /lib/ld-2.1.3.so
40015000-40016000 r--p 00000000 08:06 2424834 /usr/share/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES
40016000-40017000 r--p 00000000 08:06 2408452 /usr/share/locale/en_US/LC_MONETARY
40017000-40018000 r--p 00000000 08:06 2408454 /usr/share/locale/en_US/LC_TIME
40018000-40023000 r-xp 00000000 08:06 311344 /lib/libpthread-0.8.so
40023000-4002a000 rw-p 0000a000 08:06 311344 /lib/libpthread-0.8.so
4002b000-40034000 r-xp 00000000 08:06 1081477 /usr/local/java/jre1.3.1_01/lib/i386/native_threads/libhpi.so
40034000-40035000 rw-p 00008000 08:06 1081477 /usr/local/java/jre1.3.1_01/lib/i386/native_threads/libhpi.so
40035000-403b0000 r-xp 00000000 08:06 2769091 /usr/local/java/jre1.3.1_01/lib/i386/server/libjvm.so
403b0000-403b1000 ---p 0037b000 08:06 2769091 /usr/local/java/jre1.3.1_01/lib/i386/server/libjvm.so
403b1000-404fd000 rw-p 0037b000 08:06 2769091 /usr/local/java/jre1.3.1_01/lib/i386/server/libjvm.so
40515000-40517000 r-xp 00000000 08:06 311314 /lib/libdl-2.1.3.so
40517000-40519000 rw-p 00001000 08:06 311314 /lib/libdl-2.1.3.so
4051a000-40607000 r-xp 00000000 08:06 311305 /lib/libc-2.1.3.so
40607000-4060b000 rw-p 000ec000 08:06 311305 /lib/libc-2.1.3.so
4060f000-40621000 r-xp 00000000 08:06 311318 /lib/libnsl-2.1.3.so
40621000-40623000 rw-p 00011000 08:06 311318 /lib/libnsl-2.1.3.so
40625000-40641000 r-xp 00000000 08:06 311316 /lib/libm-2.1.3.so
40641000-40642000 rw-p 0001b000 08:06 311316 /lib/libm-2.1.3.so
40642000-40676000 r-xp 00000000 08:06 704575 /usr/lib/libstdc++-2-libc6.1-1-2.9.0.so
40676000-40682000 rw-p 00033000 08:06 704575 /usr/lib/libstdc++-2-libc6.1-1-2.9.0.so
40684000-40695000 r-xp 00000000 08:06 1081479 /usr/local/java/jre1.3.1_01/lib/i386/libverify.so
40695000-40697000 rw-p 00010000 08:06 1081479 /usr/local/java/jre1.3.1_01/lib/i386/libverify.so
40697000-406b8000 r-xp 00000000 08:06 1081480 /usr/local/java/jre1.3.1_01/lib/i386/libjava.so
406b8000-406ba000 rw-p 00020000 08:06 1081480 /usr/local/java/jre1.3.1_01/lib/i386/libjava.so
406bb000-406cf000 r-xp 00000000 08:06 1081481 /usr/local/java/jre1.3.1_01/lib/i386/libzip.so
406cf000-406d2000 rw-p 00013000 08:06 1081481 /usr/local/java/jre1.3.1_01/lib/i386/libzip.so
406d2000-41400000 r--s 00000000 08:06 1081510 /usr/local/java/jre1.3.1_01/lib/rt.jar
4142d000-416d2000 r--s 00000000 08:06 1081511 /usr/local/java/jre1.3.1_01/lib/i18n.jar
416d2000-416e8000 r--s 00000000 08:06 1081498 /usr/local/java/jre1.3.1_01/lib/sunrsasign.jar
77a9f000-77ab5000 r--p 00000000 08:06 2408451 /usr/share/locale/en_US/LC_CTYPE
77ab5000-77abd000 r--p 00000000 08:06 2408450 /usr/share/locale/en_US/LC_COLLATE
77abd000-77abe000 r--p 00000000 08:06 2408453 /usr/share/locale/en_US/LC_NUMERIC
77abe000-77abf000 r-xp 00000000 08:06 1622117 /usr/lib/gconv/ISO8859-1.so
77abf000-77ac0000 rw-p 00000000 08:06 1622117 /usr/lib/gconv/ISO8859-1.so
77ac1000-77ac9000 r-xp 00000000 08:06 311336 /lib/libnss_files-2.1.3.so
77ac9000-77aca000 rw-p 00007000 08:06 311336 /lib/libnss_files-2.1.3.so
77b37000-77b40000 r-xp 00000000 08:06 1081484 /usr/local/java/jre1.3.1_01/lib/i386/libnet.so
77b40000-77b41000 rw-p 00008000 08:06 1081484 /usr/local/java/jre1.3.1_01/lib/i386/libnet.so
77b41000-77b45000 r-xp 00000000 08:06 1081513 /usr/local/java/jre1.3.1_01/lib/i386/libNBIO.so
77b45000-77b46000 rw-p 00003000 08:06 1081513 /usr/local/java/jre1.3.1_01/lib/i386/libNBIO.so
77b46000-77b4f000 r-xp 00000000 08:06 311342 /lib/libnss_nisplus-2.1.3.so
77b4f000-77b51000 rw-p 00008000 08:06 311342 /lib/libnss_nisplus-2.1.3.so
77b51000-77b59000 r-xp 00000000 08:06 311340 /lib/libnss_nis-2.1.3.so
77b59000-77b5b000 rw-p 00007000 08:06 311340 /lib/libnss_nis-2.1.3.so
77b5b000-77b5e000 r-xp 00000000 08:06 311334 /lib/libnss_dns-2.1.3.so
77b5e000-77b5f000 rw-p 00002000 08:06 311334 /lib/libnss_dns-2.1.3.so
77b5f000-77b6b000 r-xp 00000000 08:06 311346 /lib/libresolv-2.1.3.so
77b6b000-77b6c000 rw-p 0000b000 08:06 311346 /lib/libresolv-2.1.3.so
Local Time = Wed Nov 21 23:17:38 2001
Elapsed Time = 26581
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Server VM (1.3.1_01 mixed mode)
# An error report file has been saved as hs_err_pid20055.log.
# Please refer to the file for further information.
Yummy. Signal 11's really make my day fun :(. I tried restarting the Server, but it crashed again in the same way 15 minutes later. Then I switched back to default settings and it has run fine all weekend.
The Sig11 makes me think either our C lib is buggy (our Linux distro is getting a bit old), or we have a physical memory problem. Odd that it only shows up when I tried your new settings though...

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    21/12/2013 12:49:39.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Resume -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:49:39.000 pm kernel[0]: wlEvent: en1 en1 Link DOWN virtIf = 0
    21/12/2013 12:49:39.000 pm kernel[0]: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
    21/12/2013 12:49:39.534 pm WindowServer[165]: CGXDisplayDidWakeNotification [2300400851183]: posting kCGSDisplayDidWake
    21/12/2013 12:49:39.535 pm WindowServer[165]: handle_will_sleep_auth_and_shield_windows: NULL shield_window (lock state: 1)
    21/12/2013 12:49:39.666 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Inactive
    21/12/2013 12:49:39.728 pm configd[17]: network changed: v4(en1-:192.168.0.6) DNS- Proxy-
    21/12/2013 12:49:39.731 pm netbarrierd[80]: Switched to No Network. No active profile set
    21/12/2013 12:49:39.743 pm mDNSResponder[42]: mDNSPlatformSourceAddrForDest: connect 121.210.128.136 failed errno 51 (Network is unreachable)
    21/12/2013 12:49:39.000 pm kernel[0]: 00000000  00000020  NVEthernet::setLinkStatus - not Active
    21/12/2013 12:49:40.613 pm CalendarAgent[230]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline." UserInfo=0x7ff26e008b30 {NSUnderlyingError=0x7ff26e01a170 "The Internet connection appears to be offline.", NSErrorFailingURLStringKey=https://chris.molloy%[email protected]/48736889/principal///chris.molloy%[email protected]/48736889/principal/, NSErrorFailingURLKey=https://chris.molloy%[email protected]/48736889/principal///chris.molloy%[email protected]/48736889/principal/, AccountName=iCloud, CalDAVErrFromRefresh=YES, NSLocalizedDescription=The Internet connection appears to be offline.}]
    21/12/2013 12:49:40.694 pm CalendarAgent[230]: [com.apple.calendar.store.log.caldav.queue] [Adding [<CalDAVAccountRefreshQueueableOperation: 0x7ff269ed6140; Sequence: 0>] to failed operations.]
    21/12/2013 12:49:43.578 pm mDNSResponder[42]: mDNSPlatformSourceAddrForDest: connect 121.210.128.136 failed errno 51 (Network is unreachable)
    21/12/2013 12:50:17.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Suspend -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:51:00.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:51:01.488 pm IntegoMenu[262]: (
              0   CoreFoundation                      0x00007fff86cb641c __exceptionPreprocess + 172
              1   libobjc.A.dylib                     0x00007fff8fa24e75 objc_exception_throw + 43
              2   CoreFoundation                      0x00007fff86cb5fc9 -[NSException raise] + 9
              3   personalbackup                      0x00000001030298e6 personalbackup + 10470
              4   Foundation                          0x00007fff8c3f9094 __NSFireTimer + 96
              5   CoreFoundation                      0x00007fff86c1d724 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
              6   CoreFoundation                      0x00007fff86c1d25f __CFRunLoopDoTimer + 1151
              7   CoreFoundation                      0x00007fff86c8e76a __CFRunLoopDoTimers + 298
              8   CoreFoundation                      0x00007fff86bd8aa5 __CFRunLoopRun + 1525
              9   CoreFoundation                      0x00007fff86bd8275 CFRunLoopRunSpecific + 309
              10  HIToolbox                           0x00007fff8930ff0d RunCurrentEventLoopInMode + 226
              11  HIToolbox                           0x00007fff8930fcb7 ReceiveNextEventCommon + 479
              12  HIToolbox                           0x00007fff8930fabc _BlockUntilNextEventMatchingListInModeWithFilter + 65
              13  AppKit                              0x00007fff8799d28e _DPSNextEvent + 1434
              14  AppKit                              0x00007fff8799c8db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122
              15  AppKit                              0x00007fff879909cc -[NSApplication run] + 553
              16  AppKit                              0x00007fff8797b803 NSApplicationMain + 940
              17  IntegoMenu                          0x0000000100001aa8 start + 52
    21/12/2013 12:51:02.144 pm com.apple.time[217]: Interval maximum value is 946100000 seconds (specified value: 9223372036854775807).
    21/12/2013 12:51:02.341 pm xpcproxy[557]: assertion failed: 13B42: xpcproxy + 3438 [EE7817B0-1FA1-3603-B88A-BD5E595DA86F]: 0x2
    21/12/2013 12:51:02.737 pm com.apple.iCloudHelper[557]: AOSKit ERROR: Config request failed, url=https://setup.icloud.com/configurations/init, requestHeaders=
        "Accept-Language" = "en-au";
        "X-Mme-Client-Info" = "<MacBookPro5,1> <Mac OS X;10.9.1;13B42> <com.apple.AOSKit/176>";
        "X-Mme-Country" = AU;
        "X-Mme-Nac-Version" = 11A457;
        "X-Mme-Timezone" = AEDT;
    error=Error Domain=kCFErrorDomainCFNetwork Code=-1009 "The Internet connection appears to be offline." UserInfo=0x7f8b9b562c70 {NSErrorFailingURLStringKey=https://setup.icloud.com/configurations/init, NSLocalizedDescription=The Internet connection appears to be offline., NSErrorFailingURLKey=https://setup.icloud.com/configurations/init}, httpStatusCode=-1, responseHeaders=
    (null)
    21/12/2013 12:51:02.959 pm com.apple.iCloudHelper[557]: AOSKit ERROR: Config request failed, url=https://setup.icloud.com/configurations/init, requestHeaders=
        "Accept-Language" = "en-au";
        "X-Mme-Client-Info" = "<MacBookPro5,1> <Mac OS X;10.9.1;13B42> <com.apple.AOSKit/176>";
        "X-Mme-Country" = AU;
        "X-Mme-Nac-Version" = 11A457;
        "X-Mme-Timezone" = AEDT;
    error=Error Domain=kCFErrorDomainCFNetwork Code=-1009 "The Internet connection appears to be offline." UserInfo=0x7f8b9b446c10 {NSErrorFailingURLStringKey=https://setup.icloud.com/configurations/init, NSLocalizedDescription=The Internet connection appears to be offline., NSErrorFailingURLKey=https://setup.icloud.com/configurations/init}, httpStatusCode=-1, responseHeaders=
    (null)
    21/12/2013 12:51:02.961 pm com.apple.iCloudHelper[557]: AOSKit ERROR: Setup request failed, appleID=48736889, url=(null), requestHeaders=
    (null),
    error=Error Domain=AOSErrorDomain Code=1000 "The operation couldn’t be completed. (AOSErrorDomain error 1000.)" UserInfo=0x7f8b9b438ed0 {HttpStatusCode=0, DialogInfo={
        DialogType = Unknown;
    }}, httpStatusCode=0, responseHeaders=
    (null),
    responseBody=
    (null)
    21/12/2013 12:51:03.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Resume -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:51:03.000 pm kernel[0]: MacAuthEvent en1   Auth result for: 00:26:18:67:14:8c  MAC AUTH succeeded
    21/12/2013 12:51:03.000 pm kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
    21/12/2013 12:51:03.000 pm kernel[0]: AirPort: Link Up on en1
    21/12/2013 12:51:03.000 pm kernel[0]: en1: BSSID changed to 00:26:18:67:14:8c
    21/12/2013 12:51:03.000 pm kernel[0]: AirPort: RSN handshake complete on en1
    21/12/2013 12:51:04.000 pm kernel[0]: flow_divert_kctl_disconnect (0): disconnecting group 1
    21/12/2013 12:51:04.606 pm sandboxd[115]: ([280]) coreaudiod(280) deny file-read-data /Library/Audio/Plug-Ins/Components/GuitarRig 2.component
    21/12/2013 12:51:04.613 pm sandboxd[115]: ([280]) coreaudiod(280) deny file-read-metadata /Library/Audio/Plug-Ins/Components/GuitarRig 2.component/Contents
    21/12/2013 12:51:04.619 pm sandboxd[115]: ([280]) coreaudiod(280) deny file-read-metadata /Library/Audio/Plug-Ins/Components/GuitarRig 2.component
    21/12/2013 12:51:04.956 pm airportd[67]: _doAutoJoin: Already associated to “BigPond4447”. Bailing on auto-join.
    21/12/2013 12:51:07.122 pm mDNSResponder[42]: mDNSPlatformSourceAddrForDest: connect 121.210.128.136 failed errno 51 (Network is unreachable)
    21/12/2013 12:51:11.622 pm mDNSResponder[42]: mDNSPlatformSourceAddrForDest: connect 121.210.128.136 failed errno 51 (Network is unreachable)
    21/12/2013 12:51:14.030 pm fontd[223]: ATSFindFolder timeout. (domain:-32763, dirType:'font', createFolder:false, ATSServer pid:223)
    21/12/2013 12:51:20.000 pm kernel[0]: nfs server localhost:/qjWzPqR3WaunoZwZ79rEAX: not responding
    21/12/2013 12:51:20.140 pm KernelEventAgent[48]: tid 54485244 received event(s) VQ_NOTRESP (1)
    21/12/2013 12:51:51.000 pm kernel[0]: nfs server localhost:/qjWzPqR3WaunoZwZ79rEAX: not responding
    21/12/2013 12:51:54.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Suspend -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:52:20.000 pm kernel[0]: nfs server localhost:/qjWzPqR3WaunoZwZ79rEAX: dead
    21/12/2013 12:52:20.183 pm KernelEventAgent[48]: tid 54485244 received event(s) VQ_DEAD (32)
    21/12/2013 12:52:20.183 pm KernelEventAgent[48]: tid 54485244 type 'mtmfs', mounted on '/Volumes/MobileBackups', from 'localhost:/qjWzPqR3WaunoZwZ79rEAX', dead
    21/12/2013 12:52:20.184 pm KernelEventAgent[48]: tid 54485244 force unmount localhost:/qjWzPqR3WaunoZwZ79rEAX from /Volumes/MobileBackups
    21/12/2013 12:52:20.184 pm KernelEventAgent[48]: tid 54485244 found 1 filesystem(s) with problem(s)
    21/12/2013 12:52:23.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:52:24.423 pm configd[17]: network changed: DNS* Proxy
    21/12/2013 12:52:24.425 pm UserEventAgent[11]: Captive: [CNInfoNetworkActive:1655] en1: SSID 'BigPond4447' making interface primary (cache indicates network not captive)
    21/12/2013 12:52:24.430 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Evaluating
    21/12/2013 12:52:24.432 pm UserEventAgent[11]: Captive: en1: Not probing 'BigPond4447' (cache indicates not captive)
    21/12/2013 12:52:24.433 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Authenticated
    21/12/2013 12:52:24.476 pm configd[17]: network changed: v4(en1!:192.168.0.6) DNS+ Proxy+ SMB
    21/12/2013 12:52:24.502 pm netbarrierd[80]: Unidentified network detected. Switch to profile "Home"
    21/12/2013 12:52:24.813 pm com.apple.backupd[562]: Starting automatic backup
    21/12/2013 12:52:24.000 pm kernel[0]: nspace-handler-set-snapshot-time: 1387590746
    21/12/2013 12:52:24.960 pm com.apple.mtmd[40]: Set snapshot time: 2013-12-21 12:52:26 +1100 (current time: 2013-12-21 12:52:24 +1100)
    21/12/2013 12:52:25.070 pm netbarrierd[80]: Switched to Network (Router IP(192.168.0.1) MAC(00:24:b2:a3:4a:d0) Name(BigPond4447)
    21/12/2013 12:52:25.070 pm netbarrierd[80]: Known network detected. Switch to profile "Home"
    21/12/2013 12:52:28.508 pm apsd[65]: Unrecognized leaf certificate
    21/12/2013 12:52:29.625 pm CalendarAgent[230]: [com.apple.calendar.store.log.subscription] [Failed to refresh <CalManagedSubscriptionInfo: 0x7ff26e51c7a0> (entity: SubscriptionInfo; id: 0x40012b <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/SubscriptionInfo/p1> ; data: {
        calendar = "0x14000eb <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/CalDAVSubscribedCalendar/p5> ";
        hasAlarmFilter = 0;
        hasAttachmentFilter = 0;
        hasTaskFilter = 0;
        isAutoProvisioned = 0;
        isAutoRefreshed = 0;
        languageCode = nil;
        lastError = "0x5680016b <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/SubscriptionError/p346>";
        locationCode = nil;
        needsRefresh = 0;
        refreshDate = nil;
        refreshInterval = 0;
        subscriptionID = nil;
        subscriptionNotes = nil;
        subscriptionTitle = nil;
        subscriptionURL = "(...not nil..)";
        subscriptionURLString = "webcal://ical.me.com/alexyim/Holidays.ics";
    }) with error Error Domain=CalSubscriptionErrorDomain Code=-1 "The operation couldn’t be completed. (CalSubscriptionErrorDomain error -1.)"]
    21/12/2013 12:52:29.000 pm kernel[0]: wlEvent: en1 en1 Link DOWN virtIf = 0
    21/12/2013 12:52:29.000 pm kernel[0]: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
    21/12/2013 12:52:30.000 pm kernel[0]: MacAuthEvent en1   Auth result for: 20:c9:d0:a8:60:47  MAC AUTH succeeded
    21/12/2013 12:52:30.000 pm kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
    21/12/2013 12:52:30.000 pm kernel[0]: AirPort: Link Up on en1
    21/12/2013 12:52:30.000 pm kernel[0]: en1: BSSID changed to 20:c9:d0:a8:60:47
    21/12/2013 12:52:30.000 pm kernel[0]: AirPort: RSN handshake complete on en1
    21/12/2013 12:52:30.065 pm configd[17]: LINKLOCAL en1: parent has no IP
    21/12/2013 12:52:30.081 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Inactive
    21/12/2013 12:52:30.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Resume -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:52:30.239 pm configd[17]: network changed: v4(en1-:192.168.0.6) DNS- Proxy-
    21/12/2013 12:52:30.243 pm netbarrierd[80]: Switched to No Network. No active profile set
    21/12/2013 12:52:30.258 pm configd[17]: network changed: DNS* Proxy
    21/12/2013 12:52:30.260 pm UserEventAgent[11]: Captive: [CNInfoNetworkActive:1655] en1: SSID 'Time Machine' making interface primary (cache indicates network not captive)
    21/12/2013 12:52:30.261 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Evaluating
    21/12/2013 12:52:30.263 pm UserEventAgent[11]: Captive: en1: Not probing 'Time Machine' (cache indicates not captive)
    21/12/2013 12:52:30.263 pm UserEventAgent[11]: Captive: CNPluginHandler en1: Authenticated
    21/12/2013 12:52:30.321 pm configd[17]: network changed: v4(en1!:192.168.0.6) DNS+ Proxy+ SMB
    21/12/2013 12:52:30.328 pm netbarrierd[80]: Switched to Network (Router IP(192.168.0.1) MAC(00:24:b2:a3:4a:d0) Name(Time Machine)
    21/12/2013 12:52:30.328 pm netbarrierd[80]: Known network detected. Switch to profile "Home"
    21/12/2013 12:52:30.000 pm kernel[0]: flow_divert_kctl_disconnect (0): disconnecting group 1
    21/12/2013 12:52:31.164 pm airportd[67]: _doAutoJoin: Already associated to “Time Machine”. Bailing on auto-join.
    21/12/2013 12:52:32.466 pm com.apple.backupd[562]: Attempting to mount network destination URL: afp://Christopher%20Molloy;[email protected]/Data
    21/12/2013 12:52:32.539 pm NetAuthSysAgent[570]: TUAMHandler::SetUAMType setting UAMType to 13
    21/12/2013 12:52:32.745 pm com.apple.backupd[562]: Mounted network destination at mount point: /Volumes/Data using URL: afp://Christopher%20Molloy;[email protected]/Data
    21/12/2013 12:52:32.752 pm mds[41]: (Normal) Volume: volume:0x7ff0f1094000 ********** Bootstrapped Creating a default store:0 SpotLoc:(null) SpotVerLoc:(null) occlude:0 /Volumes/Data
    21/12/2013 12:52:33.492 pm apsd[65]: Unrecognized leaf certificate
    21/12/2013 12:52:34.782 pm CalendarAgent[230]: [com.apple.calendar.store.log.subscription] [Failed to refresh <CalManagedSubscriptionInfo: 0x7ff269ed4250> (entity: SubscriptionInfo; id: 0x40012b <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/SubscriptionInfo/p1> ; data: {
        calendar = "0x14000eb <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/CalDAVSubscribedCalendar/p5> ";
        hasAlarmFilter = 0;
        hasAttachmentFilter = 0;
        hasTaskFilter = 0;
        isAutoProvisioned = 0;
        isAutoRefreshed = 0;
        languageCode = nil;
        lastError = "0x5700016b <x-coredata://46AC892B-FBE5-404E-98CB-56251B43F9AA/SubscriptionError/p348>";
        locationCode = nil;
        needsRefresh = 0;
        refreshDate = nil;
        refreshInterval = 0;
        subscriptionID = nil;
        subscriptionNotes = nil;
        subscriptionTitle = nil;
        subscriptionURL = "(...not nil..)";
        subscriptionURLString = "webcal://ical.me.com/alexyim/Holidays.ics";
    }) with error Error Domain=CalSubscriptionErrorDomain Code=-1 "The operation couldn’t be completed. (CalSubscriptionErrorDomain error -1.)"]
    21/12/2013 12:53:08.000 pm kernel[0]: **** [IOBluetoothHostControllerUSBTransport][SuspendDevice] -- Suspend -- suspendDeviceCallResult = 0x0000 (kIOReturnSuccess) -- 0xa000 ****
    21/12/2013 12:53:54.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:55:13.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:56:32.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:56:34.567 pm WindowServer[165]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
    21/12/2013 12:56:35.086 pm WindowServer[165]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 1.52 seconds (server forcibly re-enabled them after 1.00 seconds)
    21/12/2013 12:56:39.000 pm kernel[0]: jnl: disk2s2: replay_journal: from: 3809280 to: 4624384 (joffset 0x3a28000)
    21/12/2013 12:56:42.000 pm kernel[0]: jnl: disk2s2: journal replay done.
    21/12/2013 12:56:42.000 pm kernel[0]: hfs: mounted Time Machine Backups on device disk2s2
    21/12/2013 12:56:43.769 pm com.apple.backupd[562]: Disk image /Volumes/Data/Christopher Molloy’s PowerBook G4 15".sparsebundle mounted at: /Volumes/Time Machine Backups
    21/12/2013 12:56:44.601 pm com.apple.backupd[562]: Backing up to /dev/disk2s2: /Volumes/Time Machine Backups/Backups.backupdb
    21/12/2013 12:56:44.633 pm mds[41]: (Error) Volume: Root store set to FSOnly with matching create! (loaded:1)
    21/12/2013 12:58:01.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 12:58:03.968 pm com.apple.backupd[562]: Event store UUIDs don't match for volume: Macintosh HD
    21/12/2013 12:58:08.287 pm com.apple.backupd[562]: Deep event scan at path:/ reason:must scan subdirs|new event db|
    21/12/2013 12:59:24.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 1:00:01.882 pm SystemUIServer[273]: Metadata.framework [Error]: mdsCopyStoreInformation failed: (268451843) (ipc/rcv) timed out
    21/12/2013 1:00:11.885 pm SystemUIServer[273]: Metadata.framework [Error]: mdsCopyStoreInformation failed: (268451843) (ipc/rcv) timed out
    21/12/2013 1:00:34.913 pm SystemUIServer[273]: Metadata.framework [Error]: mdsCopyStoreInformation failed: (268451843) (ipc/rcv) timed out
    21/12/2013 1:00:50.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 1:02:11.000 pm kernel[0]: disk0s2: I/O error.
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    21/12/2013 1:03:32.000 pm kernel[0]: disk0s2: I/O error.
    21/12/2013 1:04:51.000 pm kernel[0]: disk0s2: I/O error.

    One thing our logs have in common is the "SystemUIServer[...]: Metadata.framework [Error]: mdsCopyStoreInformation failed: (268451843) (ipc/rcv) timed out" part ...

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