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• JBossCacheService: exception occurred in cache put error occurred after changing cache mode to REPL_

  - by logoin

  Hi, we have a horizontal cluster set up on JBoss 4.2. The session replication worked fine until we changed cache mode from REPL_ASYNC to REPL_SYNC to fix a issue. We started to see warning for some session failovers: [org.jboss.web.tomcat.service.session.InstantSnapshotManager.ROOT] Failed to replicate session java.lang.RuntimeException bc [local7.warning] JBossCacheService: exception occurred in cache put ... org.jboss.web.tomcat.service.session.JBossCacheWrapper.put(JBossCacheWrapper.java:147) org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:315) org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:125) Does anyone have any idea why this happen and how to fix it if we want to still use REPL_SYNC? Any help is appreciated. Thanks!

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• How can I use System.Web.Caching.Cache in a Console application?

  - by Ron Klein

  Context: .Net 3.5, C# I'd like to have caching mechanism in my Console application. Instead of re-inventing the wheel, I'd like to use System.Web.Caching.Cache (and that's a final decision, I can't use other caching framework, don't ask why). However, it looks like System.Web.Caching.Cache is supposed to run only in a valid HTTP context. My very simple snippet looks like this: using System; using System.Web.Caching; using System.Web; Cache c = new Cache(); try { c.Insert("a", 123); } catch (Exception ex) { Console.WriteLine("cannot insert to cache, exception:"); Console.WriteLine(ex); } and the result is: cannot insert to cache, exception: System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Caching.Cache.Insert(String key, Object value) at MyClass.RunSnippet() So obviously, I'm doing something wrong here. Any ideas? Update: +1 to most answers, getting the cache via static methods is the correct usage, namely HttpRuntime.Cache and HttpContext.Current.Cache. Thank you all!

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• Mapped network drive missing from My Computer and Explorer

  - by matt wilkie

  On a Windows XP Pro SP3 machine one network drive refuses to show up in My Computer or Explorer. The missing drive letter is G:, if that matters. Other mappings work fine. Other profiles one the same machine have no problem mapping G:. I can access the G: just fine typing it into the address bar or in CMD shell. I've used TweakUI to toggle hide/show G: with no difference. TweakUI says G: should be visible. I've logged off,on between toggles to make sure the settings are taking effect. I've looked at reg key [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] and made sure it's zero'd. [insert ref link here] We've limped along with this broken setup for some time, just working around it, but some applications do not allow typing in a path when choosing a place to save files and it's reached the point where it's intolerable. So, anyone have any idea why XP won't show this drive letter? or how to fix it?

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• MySQL 5.5.9 Query Cache not working.

  - by thepearson

  I am running MySQL 5.5.9 x86_64 RPM as downloaded from mysql.com. Running on CentOS 5.5 Xen DomU. I have enabled the Query_cache however MySQL NEVER uses it. All of my tables are InnoDB. Why is the Qcache never hit? Here are my settings. mysql> SELECT VERSION(); +-----------+ | VERSION() | +-----------+ | 5.5.9 | +-----------+ 1 row in set (0.00 sec) mysql> SHOW VARIABLES LIKE '%query_cache%'; +------------------------------+-----------+ | Variable_name | Value | +------------------------------+-----------+ | have_query_cache | YES | | query_cache_limit | 2097152 | | query_cache_min_res_unit | 4096 | | query_cache_size | 536870912 | | query_cache_type | ON | | query_cache_wlock_invalidate | OFF | +------------------------------+-----------+ 6 rows in set (0.00 sec) mysql> show status like 'Qcache%'; +-------------------------+-----------+ | Variable_name | Value | +-------------------------+-----------+ | Qcache_free_blocks | 1 | | Qcache_free_memory | 536852824 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 7665775 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | +-------------------------+-----------+ 8 rows in set (0.00 sec)

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• Refresh file access time under Linux / Discard disk read cache

  - by calandoa

  I am making use of the access time to analyse some build process, but it is not working the way I want: the access time is updated the first time I read the file, then it stays the same for a long while, or until the next reboot. For instance: $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 10:03 some_file $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time is updated # waiting a few minutes... $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time has not been updated :( I suppose that the file is buffered by Linux in the free memory, the only this copy is accessed the subsequent times for speed reasons. A solution would be to discard the buffers in memory. After searching some forums, I found: sync echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches But it is not working, it seems that it only sync up the write buffers, not the read ones. May be it is due to some custom kernel configuration on my distro (fedora 9)? Or I am missing something here? Is there a way to achieve this access time refresh? Note also that I do not want to simulate some writes on my entire file tree. Because I am using some makefile based build system, this will cause the entire project to be build again.

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• New Seagate GoFlex external hard drive reporting temperature 50C and higher--defective or normal?

  - by rob

  I have a brand-new Seagate GoFlex hard drive, and my SMART diagnostics program (CrystalDiskInfo) is warnings me that the drive is running too hot. The lowest reported temperature I've seen it is 48C, and the highest so far is 56C (all of last week, it was at 50C). According to several sources I've found online, including a Google study, hard disks operating higher than 40C have shorter lifespans. The temperature in the room is usually about 23C (74F), and orienting the drive vertically vs. horizontally doesn't seem to affect the operating temperature. Does anyone else have a GoFlex external desktop drive that runs at 40C or cooler? Is my drive just defective, or is this high temperature common for these drives?

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• DNS cache-on-demand server in Win7

  - by Andrew Heath

  I live in a country that enjoys manipulating DNS entries for fun and profit. For various reasons, I cannot surf with a VPN running 100% of the time. Because some sites are only blocked via DNS spoofing, it would be very handy if I could run a local DNS server that I could update on command during active VPN sessions. Is this granularity possible on Win7? Most of the DNS server related posts on SU are regarding the more config-friendly Linux platforms...

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• VMWare guest OS is not using full hard drive space

  - by syuusuke

  Hey everyone, I'm wondering if you can give me some insight on how to figure this out. I've recently virtualized a w2k3 server that had 10GB C:\ drive size. Once I finished virtualizing it, I expanded the disk to 20GB for C:\ and within guest OS (W2K3) computer management settings, you can see it recognizes as 20GB partition C:. But for some reason, if I opened windows explorer and see the properties of C:\, it will only show total size of 10GB. Does anyone know how to solve this or even had this problem before?

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• Where does Tomcat cache my taglib .jar files?

  - by NogginTheNog

  I'm deploying a .jar file to a tomcat instance (we're running 6.0.18 on Redhat linux) and according to the log output the old .jar is still being used. I've restarted everthing I can think of, have deleted the work directory etc.etc. but to no avail. I'm no tomcat expert, so here's my question: where should I look for to ascertain if tomcat is using a cached jar and how should I prevent it from doing so?

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• Proper way to connect SATA and IDE Hard drives together?

  - by Bartek

  I have an old IDE hard drive that has a broken Windows install on it. It just won't boot up, and I've tried a variety of solutions. That's fine, I really just need a few files on the hard drive. I have a computer that uses a SATA connected hard drive. It's a working PC. I would like to connect the old IDE hard drive to that compute and basically browse through the file system, grab the files, and copy them to my existing computer. My problem is with my few attempts to connect the IDE drive I would get Boot Disk Failures and so forth. I guess it's trying to boot from the IDE but I'm not really sure. Any help would be appreciated, Thanks!

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• Does my ISP cache the DNS?

  - by Alex

  I went to my zoneedit.com, changed mydomain.com to point to a different IP. But changes haven't taken affect yet. Is this because my ISP DNS is caching?

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• High disk I/O activity in CentOS server

  - by triiim

  I have about 16 websites in a CentOS dedicated, and I am having some problems on high traffic hours, it seems to be a high disk I/O activity causing a general slowdown. I've installed atop and this is what I see on the bottom (the server has been restarted thats why the values are so low): *** system and process activity since boot *** PID RDDSK WRDSK WCANCL DSK CMD 1/18 2176 1.7G 7.3G 854.4M 39 mysqld 671 1248K 3.0G 0K 13 flush-8:0 566 0K 1.1G 0K 5 jbd2/sda2-8 2401 124.2M 529.1M 22408K 3 crond 2032 2.2G 502.0M 0K 12 nginx 2360 425.8M 115.3M 4188K 2 httpd flush-8:0 and jbd2/sda2-8 are the processes I see with iotop using 99% on the IO column, and they are the processes that write the most on the hdd (after mysql). From what I saw in google this could be caused by some ext4 related bug, the current kernel is: Linux srvr.com 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011 x86_64 x86_64 x86_64 GNU/Linux I asked the hosting support to update the kernel and they tried but they now say that the server wont boot with the new installed kernel and they had to go back to the previous, they are not helping very much. Does someone has any idea how could I solve the high disk usage caused by flush-8:0 and jbd2/sda2-8 processes?

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• What do I need to get so I can upgrade my Thinkpad x61 Tablet hard drive?

  - by user36118

  My Thinkpad X61 Tablet is running out of space, and I would like to give it a bigger drive. I would like to clone the old drive to a bigger new drive. What do I need to get to accomplish this? The fewer things to get, the better, of course. The easier, the better. My system: Thinkpad X61 Tablet. XP w/ the latest SP. I am OK with XP, and don't want to reinstall it. No optical drive. USB 2.0 connectors (Bootable, I think). Things I have: USB 2.0 external drive housing. USB flash stick (2GB).

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• Firefox, reload without cache check

  - by pmoleri

  It looks like a popular question but it's just the opposite. When I visit a site in Firefox 15 I have two different behaviours when: Pressing enter in the address bar Pressing F5 or the refresh button If I look in the network console I can see that F5 does a lot more requests, most of them about cached resources and with a 304-Not Modified answer. Is there's any shortcut to make a quick refresh? Just like pressing enter on the address bar.

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• [MINI HOW-TO] Repair Missing External Hard Drive Database Error in WHS

  - by Mysticgeek

  If you’re using external hard drives with your Windows Home Server, they might get unplugged and create an error. Here we look at running the Repair Wizard to quickly fix the issue. If an external drive that is included in your drive pool becomes unplugged or loses power, you might see the following error under Home Network Health when opening the WHS Console. To fix the issue verify the drive has power and is plugged in correctly and click Repair. The wizard launches and you’ll need to agree that you may lose data during the repair of the backup database. In this example it was a simple problem where an external drive became unplugged from the server…so you can close out of the wizard. If you look under Server Storage you can see the drive is missing…To fix the issue verify the drive has power and is plugged in correctly. WHS will add the drive back into the pool and when finished you’ll see it listed as healthy and good to go. Using external drives that are part of your storage pool may not be the best way to have your home built WHS setup, but if you do, expect occasional errors such as this. Similar Articles Productive Geek Tips Find Your Missing USB Drive on Windows XPFixing "BOOTMGR is missing" Error While Trying to Boot Windows VistaSpeed up External USB Hard Drives in Windows VistaRebit Backup Software [Review]Troubleshoot Startup Problems with Startup Repair Tool in Windows 7 & Vista TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips HippoRemote Pro 2.2 Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Know if Someone Accessed Your Facebook Account Shop for Music with Windows Media Player 12 Access Free Documentaries at BBC Documentaries Rent Cameras In Bulk At CameraRenter Download Songs From MySpace Steve Jobs’ iPhone 4 Keynote Video

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• Zero bytes on home partition

  - by Michael Z

  I decided to replace the hard drive on my machine running Ubuntu 12.04 LTS . After using the new hard drive for a few days, I noticed that the new hard drive has bad sectors. So I decided to plug my old hard drive back in. First, I plugged both hard drives in and copied some data files from the new hard drive to the old one. After unplugging the new hard drive, I booted the computer with the old hard drive, and here I got a surprise: I can see 0 bytes available on my /home partition! The df utility shows that the /home partition has 0 available bytes. I have tried to move some files. But I still has 0 bytes on /home! However, GParted correctly shows that the available size is near 2Gb. UPDATE 1: To my surprise, System Monitor shows me that approximately 2 Gb are free and 0 bytes are available on the /home partition. It's slightly shocked me! Are "free" and "available" not the same? Any help is really appreciated!

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• How do you limit root partition disk access to allow drive to go into stanby mode?

  - by Casey

  When there are no users on my system, I would like the hard disk to spindown to low-power state. I realize that this might not be 100% achievable for a straight 24 hours, but it seems reasonable that the system could remain idle for a few hours at a time when it is not in use. My system is headless and running a limited number of services. The primary services are: exim4, mythtv-backend, nfs, samba, cups, apt-cacher-ng Assume that drives are already enabled to go into standby mode. Also, its not acceptable to increase the write-back timeout, since my system is not on a UPS.

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• How do I execute a file from a FAT USB drive?

  - by Derek Redfern

  I'm trying to install a portable app onto my USB drive such that it is compatible with both Ubuntu and Windows (specifically, a program called eToys). Support is already built into the app for both operating systems - there's etoys.sh for Ubuntu and etoys.exe for Windows. I decided to install onto a FAT drive since that can be read from both systems. This works fine for Windows, but for some reason I cannot execute etoys.sh on Ubuntu. The problem is not with the file - when the whole folder is copied to the local hard drive, the app works great in Ubuntu. But when I try to execute it from the USB, it opens the file in a text editor. I then tried running it from a terminal, but I got the message "Permission denied." I've had the same problem with other executables as well. Is there an easy way to execute things from a USB stick? Thanks! -- Derek

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• How to install my current Ubuntu based OS on to an external drive? [closed]

  - by Godel Fishbreath

  Possible Duplicate: How do I install Ubuntu to a USB key? How to copy an Ubuntu install from one laptop to another I have found urls to install ubuntu to a HD. But my current system has been upgraded and updated so often that it does not resemble anything on the web or on my drive disks. So giving my a url to how to install ubuntu will fail. Give me instead 'how to install my current Linux/Ubuntu based system (11.04) and all the upgrades to my external HD. Or alternately how to back up the OS into a bootable external HD. I am looking for either urls or a very complete explanation.

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• IE 8 doesn't appear to clear cache on demand. Is anyone else seeing this?

  - by Steve

  I have a client that uploads updated pdf files to her Concrete5 CMS, through the file manager, replacing the old file with the same name. She then does a cms "clear cache" and exits as she should. Then, in testing, she finds that the old file still comes up when clicking on the link. On further review, the cms file manager version tracking shows that the file has been updated, and, for me, the new file comes up, as it should, when clicking the link. My client hase also refreshed her browser cache and still, she only gets the old file when clicking on the link. She says that, while she can't seem to force an immediate cache update, overnight it appears to update. My client is also part of a large company-wide lan and intranet. Is it possible that there is a cache function placed outside of her local browser and cms cache that is not updating?

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• Ubuntu 12.04 3.2 Kernel showing incorrect "cache size" in cpuinfo?

  - by Tom G

  2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number: cache size : 12288 KB However mine shows this: processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz stepping : 2 microcode : 0x1 cpu MHz : 2400.104 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx bogomips : 4800.20 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual Any idea on why it shows like it's missing 8MB in CPU cache? .

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• Enable all caches except asp net cache

  - by Timmy O' Tool

  Hi I have different urls that points to the same code www.url1.com www.url2.com I need to use the cache, but if the asp net cache is enabled when someone access to www.url1.com next person accessing www.url2.com could get the previously cached data (www.url1.com) I need to have ALL caches activated except this one.

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• Mobile Safari 5mb HTML5 application cache limit?

  - by JFH

  It's becoming evident in my testing that there's a 5mb size limit on Mobile Safari's implementation of HTML5's application cache. Does anyone know how to circumvent or raise this? Is there some unexposed meta tag that I should know about? I have to cache some video content for an offline app and 5mb is not going to be enough.

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• PostSharp Cache Sample NOT working outside of the sample solution

  - by SP

  PostSharp's Cache sample project works, but when I copy all classes and try to replicate it on my own solution, Cache does NOT happen. But build does not fail, so there must be something going on. Any tips?

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• Max size iPad / iPhone Offline Application Cache

  - by Rien

  Anyone knows the max size of Safari's 'Offline Application Cache' on the iPad & iPhone. Looks like it's 5MB. Is there any way to enlarge this size? Offline application cache docs: http://developer.apple.com/safari/library/documentation/iPhone/Conceptual/SafariJSDatabaseGuide/OfflineApplicationCache/OfflineApplicationCache.html

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