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• Maximum number of hard drives in a build-your-own NAS solution [closed]

  - by groovehunter

  My IT department has a bunch of older 160/320GB Drives. I'd like to use them in a build-your-own NAS device. What limitations exist in regards to the maximum number of drives that can be connected to typical commodity hardware that might be used in a situation like this? EDIT okay I like to specify my question is what to search for to find a storage controller which can handle many drives. I simply cannot find the right search terms.

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• what NAS cellera services to be monitered?

  - by wildchild

  We have a monitoring tool called SCOM which mainly monitors different OS related services .However, we being part of storage team would also like some of our services to be monitored. We have HP NAS , and I am wondering what all services I can ask the other team to monitor for us and alert us if something goes wrong. The same goes with celerra and centera what important services can be monitored .I did search but to no avail.I ‘m not finding any of the useful services..Any help in this regard is greatly appreaciated thanks!

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• What's your opinion in Amazon S3 ?

  - by Space Cracker

  i searching for best online file storage and i found a lot with different features ... i feel that Amazon S3 is the best ... Could any who try such a service give me his opinion on it and if is there any others that are most valuable Amazon S3 ?

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• Does a HP MDS600 fit in a HP 10636 G2 rack?

  - by Jasmine Lognnes

  In the Quick Installation Giide to the MDS600/D6000 storage server it says IMPORTANT: Some racks other than the HP Rack 10000 Series rack do not allow full access to hard drive bays 29-35 in hard drive drawer 2. I have a HP 10636 G2 19" Rack 36U (PN: AF011A). Question It is temping to think that the rack is supported, but can anyone comfirm that 10000 Series to HP means 10xxx, so my rack is supported?

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• How should we serve files in a small bioinformatics cluster?

  - by cespinoza

  We have a small cluster of six ubuntu servers. We run bioinformatics analyses on these clusters. Each analysis takes about 24 hours to complete, each core i7 server can handle 2 at a time, takes as input about 5GB data and outputs about 10-25GB of data. We run dozens of these a week. The software is a hodgepodge of custom perl scripts and 3rd party sequence alignment software written in C/C++. Currently, files are served from two of the compute nodes (yes, we're using compute nodes as file servers)-- each node has 5 1TB sata drives mounted separately (no raid) and is pooled via glusterfs 2.0.1. They each have as 3 bonded intel ethernet pci gigabit ethernet cards, attached to a d-link DGS-1224T switch ($300 24 port consumer-level). We are not currently using jumbo frames (not sure why, actually). The two file-serving compute nodes are then mirrored via glusterfs. Each of the four other nodes mounts the files via glusterfs. The files are all large (4gb+), and are stored as bare files (no database/etc) if that matters. As you can imagine, this is a bit of a mess that grew organically without forethought and we want to improve it now that we're running out of space. Our analyses are I/O intensive and it is a bottle neck-- we're only getting 140mB/sec between the two fileservers, maybe 50mb/sec from the clients (which only have single NICs). We have a flexible budget which I can probably get up $5k or so. How should we spend our budget? We need at least 10TB of storage fast enough to serve all nodes. How fast/big does the cpu/memory of such a file server have to be? Should we use NFS, ATA over Ethernet, iSCSI, Glusterfs, or something else? Should we buy two or more servers and create some sort of storage cluster, or is 1 server enough for such a small number of nodes? Should we invest in faster NICs (say, PCI-express cards with multiple connectors)? The switch? Should we use raid, if so, hardware or software? and which raid (5, 6, 10, etc)? Any ideas appreciated. We're biologists, not IT gurus.

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• Making many network shares appear as one

  - by jimbojw

  Givens: disk is cheap, and there's plenty lying around on various computers around the corporate intranet redundant contiguous large storage volumes are expensive Problem: It would be fantastic to have a single entry point (drive letter, network path) that presents all this space as one contiguous filesystem, effectively abstracting the disk and network architecture from the paths presented to users. Does anyone know how to implement such a solution? I'm open to Windows and non-windows solutions, free and proprietary.

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• System.ComponentModel.Win32Exception Message: Not enough storage is available to process this comman

  - by george9170

  short of restarting our server, is there anyway we can get this memory released and our website up and running. Below is a trace from the event viewer An unhandled exception occurred and the process was terminated. Application ID: /LM/W3SVC/17/ROOT Process ID: 14352 Exception: System.ComponentModel.Win32Exception Message: Not enough storage is available to process this command StackTrace: at MS.Win32.UnsafeNativeMethods.RegisterClassEx(WNDCLASSEX_D wc_d) at MS.Win32.HwndWrapper..ctor(Int32 classStyle, Int32 style, Int32 exStyle, Int32 x, Int32 y, Int32 width, Int32 height, String name, IntPtr parent, HwndWrapperHook[] hooks) at MS.Win32.MessageOnlyHwndWrapper..ctor() at System.Windows.Threading.Dispatcher..ctor() at System.Windows.Threading.Dispatcher.get_CurrentDispatcher() at ISC.MapDotNetServer.MapPrintSupport.BaseTileRequestorResolver.b__0() at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

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• Stack data storage order

  - by Jamie Dixon

  When talking about a stack in either computing or "real" life we usually assume a "first on, last off" type of functionality. Because the idea of a stack is based around something in the physical world, does it matter how the data in the stack is stored? I notice in a lot of examples that the storage of the stack data is quite often done using an array and the newest item added to the stack is placed at the bottom of the array. (like adding a new plate to an existing stack of plates except putting it underneath the other plates rather than on top). As a paradigm, does it matter in what order the data is stored within the stack as long as the operation of the stack acts as expected?

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• Azure Table Storage data Consistency

  - by SeeR

  Let say I have Table in Azure Table Storage public class MyTable { public string PK {get; set;} public string RowPK {get; set;} public double Amount {get; set;} } And message in Azure Queue which says Add 10 to Amount. Now let say one worker role Takes this message from queue Takes row from table Amount += 10 Updates Row in Table And Fails After a while message is available in queue again. So next worker role: Takes this message from queue Takes row from table Amount += 10 Updates Row in Table Removes message from queue Those actions results in Amount += 20 instead of Amount += 10. How can I avoid such situations?

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• Can't create blob container on Azure Blob Storage

  - by desautelsj

  The following code throws an error on the "CreateIfNotExist" method call. I am attempting to connect to my Azure Blob storage and create a new container called "images" var storageAccount = new CloudStorageAccount( new StorageCredentialsAccountAndKey("my_account_name", "... my shared key ..."), "https://blob.core.windows.net/", "https://queue.core.windows.net/", "https://table.core.windows.net/" ); var blobClient = storageAccount.CreateCloudBlobClient(); var blobContainer = blobClient.GetContainerReference("images"); blobContainer.CreateIfNotExist(); The error is: [StorageClientException: The requested URI does not represent any resource on the server.] The "images" container does not exist but I was expecting it to be created instead of an error to be thrown. What am I doing wrong? I have tried HTTP instead of HTTPS but the result is the same error.

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• Boost Thread Specific Storage Question (boost/thread/tss.hpp)

  - by Hassan Syed

  The boost threading library has an abstraction for thread specific (local) storage. I have skimmed over the source code and it seems that the TSS functionality can be used in an application with any existing thread regardless of weather it was created from boost::thread --i.e., this implies that certain callbacks are registered with the kernel to hook in a callback function that may call the destructor of any TSS objects when the thread or process is going out of scope. I have found these callbacks. I need to cache HMAC_CTX's from OpenSSL inside the worker threads of various web-servers (see this, detailed, question for what I am trying to do), and as such I do not controll the life-time of the thread -- the web-server does. Therefore I will use the TSS functionality on threads not created by boost::thread. I just wanted to validate my assumptions before I started implementing the caching logic, are there any flaws in my logic ?

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• iCloud + Storage of media in iPhone Documents folder

  - by Michael Morrison

  I, like many developers, got an email from Apple recently that stated we should move our data from the documents directory into another folder to permit more streamlined backup to iCloud. In recent testing it appears that [your app] stores a fair amount of data in its Documents folder. Since iCloud backups are performed daily over Wi-Fi for each user's iOS device, it's important to ensure the best possible user experience by minimizing the amount of data being stored by your app. Marco Arment, of instapaper fame, has a good take on the issue, which is that the recommended location for storing downloadable files is in /Library/Caches. However, the problem is that both /tmp and /Caches can be 'cleaned' anytime the OS decides that the device is running low on storage. If your app is cleaned then the data downloaded by your app and stored by your user is gone. Naturally, the user will blame you and not Apple. What to do?

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• Does a version control database storage engine exist?

  - by Zak

  I was just wondering if a storage engine type existed that allowed you to do version control on row level contents. For instance, if I have a simple table with ID, name, value, and ID is the PK, I could see that row 354 started as (354, "zak", "test")v1 then was updated to be (354, "zak", "this is version 2 of the value")v2 , and could see a change history on the row with something like select history (value) where ID = 354. It's kind of an esoteric thing, but it would beat having to keep writing these separate history tables and functions every time a change is made...

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• Thread Local Storage and local method variables

  - by miguel

  In c#, each thread has its own stack space. If this is the case, why is the following code not thread-safe? (It is stated that this code is thread-safe on this post: Locking in C# class Foo { private int count = 0; public void TrySomething() { count++; } } As count is an int (stack variable), surely this value would be isolated to an individual thread, on its own stack, and therefore thread-safe? I am probably missing something here, but I dont understand what is actually in Thread Local Storage if not stack-based variables for the thread?

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• Festival TTS showing SIOD:ran out off storage message

  - by Peeyush

  Hello i am designing a front end for Festival TTS using it's C++ API Everything is working fine in my programme but i have a problem that i am giving a drop down option to user to select other languages when user select a language from drop down then festival tts shows a message on console saying: SIOD:ran out of storage This message only shows if the text given to festival TTS is greater then 5 or 6 lines. i think this message comes because SIOD's heap is not free when i am going to call a new language. So please tell me the solution of this problem. Thanks

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• Thread local storage with __declspec(thread) fails in C++/CLI

  - by EFrank

  I'm working on a project where we mix .NET code and native C++ code via a C++/CLI layer. In this solution I want to use Thread Local Storage via the __declspec(thread) declaration: __declspec(thread) int lastId = 0; However, at the first access of the variable, I get a NullReferenceException. To be more precise, the declaration is done within a ref class (a .NET class implemented in C++/CLI). I have already read something about __declspec(thread) does not work with delay loaded DLLs. Am I using delay loaded DLLs automatically if I use .NET?

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• Python: Unpack arbitary length bits for database storage

  - by sberry2A

  I have a binary data format consisting of 18,000+ packed int64s, ints, shorts, bytes and chars. The data is packed to minimize it's size, so they don't always use byte sized chunks. For example, a number whose min and max value are 31, 32 respectively might be stored with a single bit where the actual value is bitvalue + min, so 0 is 31 and 1 is 32. I am looking for the most efficient way to unpack all of these for subsequent processing and database storage. Right now I am able to read any value by using either struct.unpack, or BitBuffer. I use struct.unpack for any data that starts on a bit where (bit-offset % 8 == 0 and data-length % 8 == 0) and I use BitBuffer for anything else. I know the offset and size of every packed piece of data, so what is going to be the fasted way to completely unpack them? Many thanks.

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• Core data storage is repeated...

  - by Kamlesh

  Hi all, I am trying to use Core Data in my application and I have been succesful in storing data into the entity.The data storage is done in the applicationDidFinishLaunchingWithOptions() method.But when I run the app again,it again gets saved.So how do I check if the data is already present or not?? Here is the code(Saving):-`NSManagedObjectContext *context = [self managedObjectContext]; NSManagedObject *failedBankInfo = [NSEntityDescription insertNewObjectForEntityForName:@"FailedBankInfo" inManagedObjectContext:context]; [failedBankInfo setValue:@"Test Bank" forKey:@"name"]; [failedBankInfo setValue:@"Testville" forKey:@"city"]; [failedBankInfo setValue:@"Testland" forKey:@"state"]; NSError *error; if (![context save:&error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); } (Retrieving):- NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"FailedBankInfo" inManagedObjectContext:context]; [fetchRequest setEntity:entity]; NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error]; for (NSManagedObject *info in fetchedObjects) { NSLog(@"Name: %@", [info valueForKey:@"name"]); } `

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• Storage drives is causting system crash

  - by Chad

  I'm running Centos 5.4 with 750GB(ntfs) and 2TB drives for storage. Originally I installed the 750, everything seemed fine and then I installed the 2TB drive with NTFS already partitioned. I noticed when I would copy a lot of videos it would crash (no mouse or response from server) about 20min into it. After doing some troubleshooting I noticed the 750 would also crash when doing the same task so I decided that NTFS may be the problem. I unmounted the 2TB drive and tried to partition and format it using ext2 but when using parted it would crash at this point "writing inode tables". Looking at the dmesg logs I believe this is the error "mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining". Any idea as to what could be causing this?

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• Using memcached/APC for session storage?

  - by Industrial

  Hi everybody, I had some thoughts back ago about using memcached for session storage, but came to the conclusion that it wouldn't be sufficient in the event of one or more of the servers in the memcached pool were about to go down. A hybrid version is to save the main database (mySQL) from load caused by reads would be to work out a function that tries to fetch the data from the cache pool, and if that fails gets it from the database. After putting some more thought into it, I started to think about using APC cache for session related data. If our web server would go down, sessions would be lost either way, so storing them in a local APC or a localhost memcached server maybe isn't that bad? What's your experiences?

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• How should my main web application (A) securely retrieve data from my content storage web applicatio

  - by fonacule

  I have two web applications (A) and (B). (A) is my primary web application. (B) is purely for content storage, such as file uploads by users of (A). What's best way to securely retrieve data from (B) into (A) but in a way that does not expose the data in (B) to potential discovery by third-parties over the public internet or nosy users of (A)? For example, if I use a HTML form POST from (A) to (B) to retrieve user data, and have a hidden form field called user_id=1, then someone could simply change this to user_id=2 and see the content owned by another user of the application. That would be a problem.

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• 1030 Got error 28 from storage engine

  - by ScoRpion...

  I am working on a project where i need to create a database with 300 tables for each user who wants to see the demo application. it was working fine but today when i was testing with a new user to see a demo it showed me this error message 1030 Got error 28 from storage engine After spending some time googling i found it is an error that is related to space of database or temporary files. I tried to fix it but i failed. now i am not even able to start mysql. How can i fix this and i would also like to increase the size to maximum so that i won't face the same issue again and again.

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• How should I manage persistent score in Game Center leaderboards?

  - by Omega

  Let's say that I'm developing an iOS RPG where the player gains 1 point per monster kill. The amount of monsters killed is persistent data: it is an endless adventure, and the score keeps on growing. It isn't a "session score" like Fruit Ninja, but rather a "reputation score". There are Game Center leaderboards for that score. Keep killing monsters, your score goes up, and the leaderboards are updated. My problem is that, technically, you can log out and log in using a different Game Center account, kill one monster, and the leaderboards will be updated for the new GC account. Supposing that this score is a big deal, this could be considered as cheating, because if you have a score of 2000, any of your friends who have never played the game can simply log into your iPhone, play the game, and the system will update the score for their accounts, essentially giving them 2000 points in the leaderboards for doing nothing. I have considered linking one GC account to a specific save game. It won't update your score unless you're using the linked GC account. But what if the player actually needs to change their GC account? Technically they would be forced to start a new game and link their account to that profile. How should I prevent this kind of cheat? Essentially, I don't want someone to distribute a high schore to multiple GC accounts, given the fact that the game updates the score constantly since it isn't a "session score". I do realize that it isn't quite a big deal. But I'm curious about how to avoid this.

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• Why would 70-persistent-net.rules have no effect?

  - by Wes Felter

  I've got a saucy server with a lot of NICs and they end up with weird names like "rename19". I know interface names can be changed by modifying the /etc/udev/rules.d/70-persistent-net.rules file. The first clue that something is wrong is that that file did not exist even though it's supposed to be created automatically. So I decided to write my own based on advice from Linux From Scratch: ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:06:00.0", NAME="eth0" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:06:00.1", NAME="eth1" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:06:00.2", NAME="eth2" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:06:00.3", NAME="eth3" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:0c:00.0", NAME="mezz0" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:0c:00.1", NAME="mezz1" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:1b:00.0", NAME="slot1a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:1b:00.1", NAME="slot1b" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:20:00.0", NAME="slot2a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:20:00.1", NAME="slot2b" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:11:00.0", NAME="slot3a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:11:00.1", NAME="slot3b" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:8b:00.0", NAME="slot4a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:8b:00.1", NAME="slot4b" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:90:00.0", NAME="slot5a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:90:00.1", NAME="slot5b" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:95:00.0", NAME="slot6a" ACTION=="add", SUBSYSTEM=="net", BUS=="pci", KERNELS=="0000:95:00.1", NAME="slot6b" (I'm matching on PCI IDs instead of MAC addresses because I have multiple identical machines that I want to apply this configuration to.) After rebooting, nothing has changed. It's like these rules aren't even being read. There's not much going on in dmesg either: $ dmesg | grep udev [ 3.196629] systemd-udevd[323]: starting version 204 [ 6.719140] systemd-udevd[550]: starting version 204 [ 38.695050] init: udev-fallback-graphics main process (1658) terminated with status 1

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• MySQL: What happens if my server loses power and I'm using the MEMORY engine?

  - by Hank

  Does the MEMORY storage engine ever write to disk the database contents? Meaning, if I'm using the MEMORY storage engine and my database server loses power - do I lose all of my database content or is it backed up to disk?

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