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  • ??????Sun ZFS Storage Appliance?????????????????·?????????

    - by Norihito Yachita
    ??????????????·????????Sun ZFS Storage 7320 Appliance??????????????????????????????????????IaaS(Infrastructure as a Service)???????????????????????????????????????????????????????? ???????????11?15?????????????4,000?????????????????????????????????????????????????????????·??????????????????????????????? ???????????????????????????????????????????????????????????????????????????????????????????????????InfiniBand???????????????????Sun ZFS Storage 7320 Appliance?????2011?5??????????6????????????????????????Sun ZFS Storage 7320 Appliance???????·???????

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  • Boost::thread mutex issue: Try to lock, access violation

    - by user1419305
    I am currently learning how to multithread with c++, and for that im using boost::thread. I'm using it for a simple gameengine, running three threads. Two of the threads are reading and writing to the same variables, which are stored inside something i call PrimitiveObjects, basicly balls, plates, boxes etc. But i cant really get it to work, i think the problem is that the two threads are trying to access the same memorylocation at the same time, i have tried to avoid this using mutex locks, but for now im having no luck, this works some times, but if i spam it, i end up with this exception: First-chance exception at 0x00cbfef9 in TTTTT.exe: 0xC0000005: Access violation reading location 0xdddddded. Unhandled exception at 0x77d315de in TTTTT.exe: 0xC0000005: Access violation reading location 0xdddddded. These are the functions inside the object that im using for this, and the debugger is also blaming them for the exception. void PrimitiveObj::setPos(glm::vec3 in){ boost::mutex mDisposingMutex; boost::try_mutex::scoped_try_lock lock(mDisposingMutex); if ( lock) { position = in; boost::try_mutex::scoped_try_lock unlock(mDisposingMutex); } } glm::vec3 PrimitiveObj::getPos(){ boost::mutex myMutex; boost::try_mutex::scoped_try_lock lock(myMutex); if ( lock) { glm::vec3 curPos = position; boost::try_mutex::scoped_try_lock unlock(myMutex); return curPos; } return glm::vec3(0,0,0); } Any ideas?

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  • MMGR Questions, code use and thread-saftey

    - by chadb
    1) Is MMGR thread safe? 2) I was hoping someone could help me understand some code. I am looking at something where a macro is used, but I don't understand the macro. I know it contains a function call and an if check, however, the function is a void function. How does wrapping "(m_setOwner (FILE,_LINE_,FUNCTION),false)" ever change return types? #define someMacro (m_setOwner(__FILE__,__LINE__,__FUNCTION__),false) ? NULL : new ... void m_setOwner(const char *file, const unsigned int line, const char *func); 3) What is the point of the reservoir? 4) On line 770 ("void *operator new(size_t reportedSize)" there is the line "// ANSI says: allocation requests of 0 bytes will still return a valid value" Who/what is ANSI in this context? Do they mean the standards? 5) This is more of C++ standards, but where does "reportedSize" come from for "void *operator new(size_t reportedSize)"? 6) Is this the code that is actually doing the allocation needed? "au-actualAddress = malloc(au-actualSize);"

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  • Is it safe to use a boolean flag to stop a thread from running in C#

    - by Lirik
    My main concern is with the boolean flag... is it safe to use it without any synchronization? I've read in several places that it's atomic. class MyTask { private ManualResetEvent startSignal; private CountDownLatch latch; private bool running; MyTask(CountDownLatch latch) { running = false; this.latch = latch; startSignal = new ManualResetEvent(false); } // A method which runs in a thread public void Run() { startSignal.WaitOne(); while(running) { startSignal.WaitOne(); //... some code } latch.Signal(); } public void Stop() { running = false; startSignal.Set(); } public void Start() { running = true; startSignal.Set(); } public void Pause() { startSignal.Reset(); } public void Resume() { startSignal.Set(); } } Is this a safe way to design a task? Any suggestions, improvements, comments? Note: I wrote my custom CountDownLatch class in case you're wondering where I'm getting it from.

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  • SAS Expanders vs Direct Attached (SAS)?

    - by jemmille
    I have a storage unit with 2 backplanes. One backplane holds 24 disks, one backplane holds 12 disks. Each backplane is independently connected to a SFF-8087 port (4 channel/12Gbit) to the raid card. Here is where my question really comes in. Can or how easily can a backplane be overloaded? All the disks in the machine are WD RE4 WD1003FBYX (black) drives that have average writes at 115MB/sec and average read of 125 MB/sec I know things would vary based on the raid or filesystem we put on top of that but it seems to be that a 24 disk backplane with only one SFF-8087 connector should be able to overload the bus to a point that might actually slow it down? Based on my math, if I had a RAID0 across all 24 disks and asked for a large file, I should, in theory should get 24*115 MB/sec wich translates to 22.08 GBit/sec of total throughput. Either I'm confused or this backplane is horribly designed, at least in a perfomance environment. I'm looking at switching to a model where each drive has it's own channel from the backplane (and new HBA's or raid card). EDIT: more details We have used both pure linux (centos), open solaris, software raid, hardware raid, EXT3/4, ZFS. Here are some examples using bonnie++ 4 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 194MB/s 19% 92MB/s 11% 200MB/s 8% 310/sec 194MB/s 19% 93MB/s 11% 201MB/s 8% 312/sec --------- ---- --------- ---- --------- ---- --------- 389MB/s 19% 186MB/s 11% 402MB/s 8% 311/sec 8 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 324MB/s 32% 164MB/s 19% 346MB/s 13% 466/sec 324MB/s 32% 164MB/s 19% 348MB/s 14% 465/sec --------- ---- --------- ---- --------- ---- --------- 648MB/s 32% 328MB/s 19% 694MB/s 13% 465/sec 12 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 377MB/s 38% 191MB/s 22% 429MB/s 17% 537/sec 376MB/s 38% 191MB/s 22% 427MB/s 17% 546/sec --------- ---- --------- ---- --------- ---- --------- 753MB/s 38% 382MB/s 22% 857MB/s 17% 541/sec Now 16 Disk RAID-0, it's gets interesting WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 359MB/s 34% 186MB/s 22% 407MB/s 18% 1397/sec 358MB/s 33% 186MB/s 22% 407MB/s 18% 1340/sec --------- ---- --------- ---- --------- ---- --------- 717MB/s 33% 373MB/s 22% 814MB/s 18% 1368/sec 20 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 371MB/s 37% 188MB/s 22% 450MB/s 19% 775/sec 370MB/s 37% 188MB/s 22% 447MB/s 19% 797/sec --------- ---- --------- ---- --------- ---- --------- 741MB/s 37% 376MB/s 22% 898MB/s 19% 786/sec 24 Disk RAID-1, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 347MB/s 34% 193MB/s 22% 447MB/s 19% 907/sec 347MB/s 34% 192MB/s 23% 446MB/s 19% 933/sec --------- ---- --------- ---- --------- ---- --------- 694MB/s 34% 386MB/s 22% 894MB/s 19% 920/sec 28 Disk RAID-0, ZFS 32 Disk RAID-0, ZFS 36 Disk RAID-0, ZFS More details: Here is the exact unit: http://www.supermicro.com/products/chassis/4U/847/SC847E1-R1400U.cfm

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  • What do these remote addresses, local addresses, and states in TCPview mean?

    - by Joe
    I have been using TCPview lately to see what connections are made by different processes on my PC. Would somebody please explain what the following situations mean? Thanks. TCP Local Address: PC1234567890:3883 Remote Address: PC1234567890:0 State: LISTENING TCP Local Address: PC1234567890:4696 Remote Address: localhost:4697 State: ESTABLISHED Local Address: PC1234567890:4697 Remote Address: localhost:4696 State: ESTABLISHED UDP Local Address: PC1234567890:1234 Remote Address: . State:

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  • Apache local configuration to resolve files correctly

    - by Alex E.
    Hello, I am new at this so bare with me. I have just configured Apache and PHP to work on my local Mac OS X computer. Now PHP works fine, except when I try to load the files for my live sites. The live sites have separate directories and are sorted by client name etc. I've created symlinks in the default root for the local web server documents. My issue is that Apache doesn't seem to want to load any of the relative paths that are found in the HTML pages. For example, I have src="/css/main.css" but Apache doesn't load the file, similarly for images, it just resolves as a file not found 404 error. I then thought it might be the symlinks so I copied the full directory into the Apache document root, and still had the same result. I would really love to setup my local development environment to run Apache, PHP, MySQL to develop locally then publish when ready. I also tried the MAMP installation, and had the same issues. Any help at all in this would be greatly appreciated. If my explanation wasn't clear please let me know. Thanks! Alex.

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  • Is there a straightforward way to have a thread-local instance variable?

    - by Dan Tao
    With the ThreadStatic attribute I can have a static member of a class with one instance of the object per thread. This is really handy for achieving thread safety using types of objects that don't guarantee thread-safe instance methods (e.g., System.Random). It only works for static members, though. Is there any straightforward way to declare a class member as thread-local, meaning, each class instance gets an object per thread?

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  • What kind of storage do people actually use for VMware ESX servers?

    - by Dirk Paessler
    VMware and many network evangelists try to tell you that sophisticated (=expensive) fiber SANs are the "only" storage option for VMware ESX and ESXi servers. Well, yes, of course. Using a SAN is fast, reliable and makes vMotion possible. Great. But: Can all ESX/ESXi users really afford SANs? My theory is that less than 20% of all VMware ESX installations on this planet actually use fiber or iSCS SANs. Most of these installation will be in larger companies who can afford this. I would predict that most VMware installations use "attached storage" (vmdks are stored on disks inside the server). Most of them run in SMEs and there are so many of them! We run two ESX 3.5 servers with attached storage and two ESX 4 servers with an iSCS san. And the "real live difference" between both is barely notable :-) Do you know of any official statistics for this question? What do you use as your storage medium?

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  • Does cloud storage replicate the data over many datacenters if so it means i benefit content delive

    - by Berkay
    Let's assume that i want to use cloud storage service from one of the cloud storage provider, i got X gb structured and unstructured data and i will use this data as my contents of my interactive web page. And now i have some doubts about this point.I have many users and they are all visiting my web page from various countries.To be more specific first; does my data stored only of the Cloud Storage data center ? or Does my data replicated over many data centers of my provider? second if so; how can i benefit from content delivery network? (matching and placing users’ content nearest storage data centers)

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  • Local SSL connections are causing redirect loop (after Ubuntu update)

    - by codeinthehole
    Following a recent Ubuntu update, my local websites are no longer serving their pages over SSL. For example, my .htaccess file attempts to ensure /sign-in is always served over HTTPS: RewriteEngine On RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} /sign-in RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,QSA,R=301] However when I make a request to /sign-in on the domain site2-local , I get the error "The page isn't redirecting properly" with the following in /var/log/apache2/error.log [Tue Jun 08 12:20:57 2010] [info] [client 127.0.1.1] Connection to child 0 established (server site1-local:443) [Tue Jun 08 12:20:57 2010] [info] Seeding PRNG with 656 bytes of entropy [Tue Jun 08 12:20:57 2010] [info] Initial (No.1) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.2) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.3) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.4) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.5) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.6) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.7) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.8) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.9) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.10) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] (70007)The timeout specified has expired: SSL input filter read failed. [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] Connection closed to child 0 with standard shutdown (server site2-local:443) There is a connection to site1-local (another site on my machine which shares the certificate), which I don't understand. Anyone know what is causing this issue?

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  • Local SSL connections are causing redirect loop (after Ubuntu update)

    - by codeinthehole
    Following a recent Ubuntu update, my local websites are no longer serving their pages over SSL. For example, my .htaccess file attempts to ensure /sign-in is always served over HTTPS: RewriteEngine On RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} /sign-in RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [L,QSA,R=301] However when I make a request to /sign-in on the domain site2-local , I get the error "The page isn't redirecting properly" with the following in /var/log/apache2/error.log [Tue Jun 08 12:20:57 2010] [info] [client 127.0.1.1] Connection to child 0 established (server site1-local:443) [Tue Jun 08 12:20:57 2010] [info] Seeding PRNG with 656 bytes of entropy [Tue Jun 08 12:20:57 2010] [info] Initial (No.1) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.2) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.3) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.4) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.5) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.6) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.7) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.8) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.9) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:20:57 2010] [info] Subsequent (No.10) HTTPS request received for child 0 (server site2-local:443) [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] (70007)The timeout specified has expired: SSL input filter read failed. [Tue Jun 08 12:21:12 2010] [info] [client 127.0.1.1] Connection closed to child 0 with standard shutdown (server site2-local:443) There is a connection to site1-local (another site on my machine which shares the certificate), which I don't understand. Anyone know what is causing this issue?

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  • Server 2003 Remote Desktop loses its virtual printer image of the local printer

    - by Charles Hart
    Server 2003 Remote Desktop provides service to stores served by several ISPs. The server loses its virtual printer image of the local printer (as seen from the remote store site) and a copy of the original local printer appears on the local computer with a different driver without notice. Specifically: A remote desktop session is opened on a local computer that has a Brother HL2140 USB printer connected and the associated software installed with a correct driver shown under the “advanced” button. The server has the same Brother software and driver. An application that is running on the server attempts to print on the local printer connected to the local computer running Vista Pro or XP Pro. Either it works correctly (Good) or it does not print (Bad) or it prints on another Local Printer connected to another local computer logged into the server (Bad and Odd). When it doesn’t print (or prints somewhere else) we ask the customer to look for the (virtual) printer using the Remote desktop view of the server and the printer is gone. Then we ask the customer to look at the printers folder in the local computer. There are several possibilities: The printer is there, but the driver is mysteriously changed in the drop down to MDX something; we have the customer select the other (proper) Brother driver, and all is well again, as now after the change, the virtual printer in the server (which now matches the local printer) appears again, and so printing can resume. A “copy” of the printer mysteriously appears in the local printer’s folder and after we delete it the virtual printer in the server appears again and so printing can resume. Note that in both case 1 and 2, the server sometimes sends the print job elsewhere, to some other local computer. Meanwhile in the log file, endless errors are reported and the server eventually crashes, sometimes twice a day. I’m puzzled what changes the local printer driver and I’m puzzled what loads the copy 2 or copy 3 of the printer in the local printer folder. This entire description randomly occurs on any of 40+ local computers in eight different locations in different ISPs, all sharing one Domain.

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  • How do I replace a harddrive that is in a two-way mirror storage space on Windows 8?

    - by Jon
    I have a storage space in Windows 8 doing a two-way mirror on three harddrives. The sizes are 297GB, 189GB, and 70GB. I would like to replace the 70GB HD with a larger one. My thought was to remove that drive from the space via the Storage Space control panel, shutdown, replace HD with bigger drive, reboot, add new HD to the storage space. I can't find any options to remove a HD from a storage space in the control panel. Should I just shutdown and swap out the small drive or is there another process for safely replacing the old HD? (By the way, the old HD is still operational.)

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  • Getting Windows Azure SDK 1.1 To Talk To A Local DB

    - by Richard Jones
    Just found this, if you’re using Azure 1.1,  which you probably will be if yo'u’ve moved to Visual Studio 2010. To change the default database to something other than sqlexpress for Development Storage do this - Look at this - http://msdn.microsoft.com/en-us/library/dd203058.aspx At the bottom it states -   Using Development Storage with SQL Server Express 2008 By default the local Windows Group BUILTIN\Administrator is not included in the SQL Server sysadmin server role on new SQL Server Express 2008 installations.  Add yourself to the sysadmin role in order to use the Development Storage Services on SQL Server Express 2008.  See SQL Server 2008 Security Changes for more information. Changing the SQL Server instance used by Development Storage By default, the Development Storage will use the SQL Express instance.  This can be changed by calling “DSInit.exe /sqlinstance:<SQL Server instance>” from the Windows Azure SDK command prompt.

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  • Azure storage - double decimal point ignored on save

    - by Fabio Milheiro
    I have a value that is correctly stored in a property of an object, but when I save the changes to the Azure storage database, the double value is stored to the database ignoring the point (7.1000000003 is saved as 711). Also, the property is changed to 711.0. How do I solve this problem? The field is already set to double in the class and the database table.

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  • Optimal xml storage engine

    - by nixau
    I'm considering optimal open source solution for storing xml documents with further querying on them effectively. Amount of data will be small. As far as I understand native xml databases might form a proper solution for my case. They obviously store xml documents in highly efficient way. It would be great to learn your experience. Any suggestions on proper solution? Have you got any experience employing xml storage engines in your apps?

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  • Image upload storage strategies

    - by MatW
    When a user uploads an image to my site, the image goes through this process; user uploads pic store pic metadata in db, giving the image a unique id async image processing (thumbnail creation, cropping, etc) all images are stored in the same uploads folder So far the site is pretty small, and there are only ~200,000 images in the uploads directory. I realise I'm nowhere near the physical limit of files within a directory, but this approach clearly won't scale, so I was wondering if anyone had any advice on upload / storage strategies for handling large volumes of image uploads.

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  • Simplest Azure Storage Manipulation possible

    - by Hurricanepkt
    I have the need to integrate some blob storage into an existing ASP.NET Mvc site my hope is to be able to just add some references and then just do puts and gets but I cannot find any simple example for how to do this (that hasn't been depricated to the point it no longer works) I have tried using StorageClient but CreateCloudBlobClient() doesn't seem to work.

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  • Right way to access the Google Cloud Storage bucket via Public API

    - by SyBer
    I'm trying the following request to access the bucket by using curl, via the public API: curl -X POST -H 'Content-Type: image/jpeg' -d @xxx.jpeg 'https://www.googleapis.com/upload/storage/v1/b/clips.eyecam.com/o?uploadType=media&name=x.jpeg&key=XXX' With XXX being the generated key in the Public API. However I'm getting an authorization failure: { "error": { "errors": [ { "domain": "global", "reason": "required", "message": "Login Required", "locationType": "header", "location": "Authorization" } ], "code": 401, "message": "Login Required" } } Seems the request is incorrect and does not pass the authorization key, any idea what would be the right form of the request?

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  • Structured Storage

    - by user342735
    Hi All, I have a file that is in structured storage format. I was wondering if this format be accessed concurrently by threads. Meaning have multiple threads read the different streams process it at once. The objective is to load the file faster. When i refer to a file i refer one that represents CAD information. Thank you.

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  • what's the best storage for text

    - by maryam
    Hi, I have an application that just only use for show information and search data. and my datatype is text and has larg size. would you please tell me what's the best storage for it. also I don't want to use SQL database. thaks

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