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• Precompile assets for a rails engine

  - by Peter Ehrlich

  In a standard app, I have this line in my production.rb, which creates endpoints for non-default precompiled assets: config.assets.precompile += %w( mobile.css ) My rails engine is a standard Sinatra app. It has its own assets. When on development, these assets are served fine, presumably the web requests are handled by rails and sprockets. On production I'm getting 404s on the assets, and think I have to manually tell sprockets to provide the files. How can this be done without tightly linking? It isin't evident how to set up env-specific initializers for engines. Is this done? Not only, for example, is config/development.rb within the engine not loaded, but there's no way to get the application class itself without knowing its name, in order to modify configuration. And even if there was, it seems that having any engine able to reconfigure the main app would be very bad idea. So maybe its better to let assets handling be done by sinatra itself? Or another instance of sprockets for the engine? How do other engines handle this?

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• SQL SERVER – Retrieve and Explore Database Backup without Restoring Database – Idera virtual databas

  - by pinaldave

  I recently downloaded Idera’s SQL virtual database, and tested it. There are a few things about this tool which caught my attention. My Scenario It is quite common in real life that sometimes observing or retrieving older data is necessary; however, it had changed as time passed by. The full database backup was 40 GB in size, and, to restore it on our production server, it usually takes around 16 to 22 minutes, depending on the load server that is usually present. This range in time varies from one server to another as per the configuration of the computer. Some other issues we used to have are the following: When we try to restore a large 40-GB database, we needed at least that much space on our production server. Once in a while, we even had to make changes in the restored database, and use the said changed and restored database for our purpose, making it more time-consuming. My Solution I have heard a lot about the Idera’s SQL virtual database tool.. Well, right after we started to test this tool, we found out that it really delivers what it promises. Using this software was very easy and we were able to restore our database from backup in less than 2 minutes, sparing us from the usual longer time of 16–22 minutes. The needful was finished in a total of 10 minutes. Another interesting observation is that there is no need to have an additional space for restoring the database. For complete database restoration, the single additional MB on the drive is not required anymore. We can use the database in the same way as our regular database, and there is no need for any additional configuration and setup. Let us look at the most relevant points of this product based on my initial experience: Quick restoration of the database backup No additional space required for database restoration virtual database has no physical .MDF or .LDF The database which is restored is, in fact, the backup file converted in the virtual database. DDL and DML queries can be executed against this virtually restored database. Regular backup operation can be implemented against virtual database, creating a physical .bak file that can be used for future use. There was no observed degradation in performance on the original database as well the restored virtual database. Additional T-SQL queries can be let off on the virtual database. Well, this summarizes my quick review. And, as I was saying, I am very impressed with the product and I plan to explore it more. There are many features that I have noticed in this tool, which I think can be very useful if properly understood. I had taken a few screenshots using my demo database afterwards. Let us see what other things this tool can do besides the mentioned activities. I am surprised with its performance so I want to know how exactly this feature works, specifically in the matter of why it does not create any additional files and yet, it still allows update on the virtually restored database. I guess I will have to send an e-mail to the developers of Idera and try to figure this out from them. I think this tool is very useful, and it delivers a high level of performance way more than what I expected. Soon, I will write a review for additional uses of SQL virtual database.. If you are using SQL virtual database in your production environment, I am eager to learn more about it and your experience while using it. The ‘Virtual’ Part of virtual database When I set out to test this software, I thought virtual database had something to do with Hyper-V or visualization. In fact, the virtual database is a kind of database which shows up in your SQL Server Management Studio without actually restoring or even creating it. This tool creates a database in SSMS from the backup of the same database. The backup, however, works virtually the same way as original database. Potential Usage of virtual database: As soon as I described this tool to my teammate, I think his very first reaction was, “hey, if we have this then there is no need for log shipping.” I find his comment very interesting as log shipping is something where logs are moved to another server. In fact, there are no updates on the database from log; I would rather compare it with Snapshot Replication. In fact, whatever we use, snapshot replicated database can be similarly used and configured with virtual database. I totally believe that we can use it for reporting purpose. In fact, after this database was configured, I think the uses of this tool are unlimited. I will have to spend some more time studying it and will get back to you. Click on images to see larger images. virtual database Console Harddrive Space before virtual database Setup Attach Full Backup Screen Backup on Harddrive Attach Full Backup Screen with Settings virtual database Setup – less than 60 sec virtual database Setup – Online Harddrive Space after virtual database Setup Point in Time Recovery Option – Timeline View virtual database Summary No Performance Difference between Regular DB vs Virtual DB Please note that all SQL Server MVP gets free license of this software. Reference: Pinal Dave (http://blog.SQLAuthority.com), Idera (virtual database) Filed under: Database, Pinal Dave, SQL, SQL Add-On, SQL Authority, SQL Backup and Restore, SQL Data Storage, SQL Query, SQL Server, SQL Tips and Tricks, SQL Utility, SQLAuthority News, T SQL, Technology Tagged: Idera

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• SQL SERVER – 2008 – Introduction to Snapshot Database – Restore From Snapshot

  - by pinaldave

  Snapshot database is one of the most interesting concepts that I have used at some places recently. Here is a quick definition of the subject from Book On Line: A Database Snapshot is a read-only, static view of a database (the source database). Multiple snapshots can exist on a source database and can always reside on the same server instance as the database. Each database snapshot is consistent, in terms of transactions, with the source database as of the moment of the snapshot’s creation. A snapshot persists until it is explicitly dropped by the database owner. If you do not know how Snapshot database work, here is a quick note on the subject. However, please refer to the official description on Book-on-Line for accuracy. Snapshot database is a read-only database created from an original database called the “source database”. This database operates at page level. When Snapshot database is created, it is produced on sparse files; in fact, it does not occupy any space (or occupies very little space) in the Operating System. When any data page is modified in the source database, that data page is copied to Snapshot database, making the sparse file size increases. When an unmodified data page is read in the Snapshot database, it actually reads the pages of the original database. In other words, the changes that happen in the source database are reflected in the Snapshot database. Let us see a simple example of Snapshot. In the following exercise, we will do a few operations. Please note that this script is for demo purposes only- there are a few considerations of CPU, DISK I/O and memory, which will be discussed in the future posts. Create Snapshot Delete Data from Original DB Restore Data from Snapshot First, let us create the first Snapshot database and observe the sparse file details. USE master GO -- Create Regular Database CREATE DATABASE RegularDB GO USE RegularDB GO -- Populate Regular Database with Sample Table CREATE TABLE FirstTable (ID INT, Value VARCHAR(10)) INSERT INTO FirstTable VALUES(1, 'First'); INSERT INTO FirstTable VALUES(2, 'Second'); INSERT INTO FirstTable VALUES(3, 'Third'); GO -- Create Snapshot Database CREATE DATABASE SnapshotDB ON (Name ='RegularDB', FileName='c:\SSDB.ss1') AS SNAPSHOT OF RegularDB; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO Now let us see the resultset for the same. Now let us do delete something from the Original DB and check the same details we checked before. -- Delete from Regular Database DELETE FROM RegularDB.dbo.FirstTable; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO When we check the details of sparse file created by Snapshot database, we will find some interesting details. The details of Regular DB remain the same. It clearly shows that when we delete data from Regular/Source DB, it copies the data pages to Snapshot database. This is the reason why the size of the snapshot DB is increased. Now let us take this small exercise to  the next level and restore our deleted data from Snapshot DB to Original Source DB. -- Restore Data from Snapshot Database USE master GO RESTORE DATABASE RegularDB FROM DATABASE_SNAPSHOT = 'SnapshotDB'; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO -- Clean up DROP DATABASE [SnapshotDB]; DROP DATABASE [RegularDB]; GO Now let us check the details of the select statement and we can see that we are successful able to restore the database from Snapshot Database. We can clearly see that this is a very useful feature in case you would encounter a good business that needs it. I would like to request the readers to suggest more details if they are using this feature in their business. Also, let me know if you think it can be potentially used to achieve any tasks. Complete Script of the afore- mentioned operation for easy reference is as follows: USE master GO -- Create Regular Database CREATE DATABASE RegularDB GO USE RegularDB GO -- Populate Regular Database with Sample Table CREATE TABLE FirstTable (ID INT, Value VARCHAR(10)) INSERT INTO FirstTable VALUES(1, 'First'); INSERT INTO FirstTable VALUES(2, 'Second'); INSERT INTO FirstTable VALUES(3, 'Third'); GO -- Create Snapshot Database CREATE DATABASE SnapshotDB ON (Name ='RegularDB', FileName='c:\SSDB.ss1') AS SNAPSHOT OF RegularDB; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO -- Delete from Regular Database DELETE FROM RegularDB.dbo.FirstTable; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO -- Restore Data from Snapshot Database USE master GO RESTORE DATABASE RegularDB FROM DATABASE_SNAPSHOT = 'SnapshotDB'; GO -- Select from Regular and Snapshot Database SELECT * FROM RegularDB.dbo.FirstTable; SELECT * FROM SnapshotDB.dbo.FirstTable; GO -- Clean up DROP DATABASE [SnapshotDB]; DROP DATABASE [RegularDB]; GO Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: SQL, SQL Authority, SQL Backup and Restore, SQL Data Storage, SQL Query, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Technology

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• Personal cloud storage options

  - by rhaddan

  I'm looking for some personal cloud storage options. My biggest concern about moving to a hosted storage solution is the long-term viability of the provider. Has anyone used a cloud service that you're crazy about? I'm a Mac user, so I need to have something that will work on the Mac OS and ideally the iPhone as well.

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• Strange error from mysql storage engine

  - by zerkms

  General error: 1030 Got error -1 from storage engine the used storage engine is innodb the query was runned when i got it today morning was: SELECT feeds.* FROM feeds ORDER BY RAND() LIMIT 1 i know rand() is bad but it's very small table (<500 records) and not loaded project this error i receive approximately once a day. cannot google anything relevant :-(

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• DOM Storage and locks

  - by user535759

  Since DOM storage and its equivalencies persist in between tabs and windows, I've thought about using it for message passing. The problem is that fetch and store are different operations, and therefore not atomic. I have models that rely on UUID generation, conflict resolutions, and beaconing to do the small subset of what I need to do, but my real question is this: Since the local storage is a shared memory resource, what are the locking mechanisms available for mutual access?

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• Local development using HTML5 storage

  - by jasongonzales

  I am experimenting with HTML5 local storage functionality, but was frustrated to learn that the browser won't allow local storage when the file is local. My guess is that the browser (Chrome in my case, FF too) wants to see a domain rather than a file location. Has anyone here discovered a workaround for developing locally? Perhaps setting up a local domain? That sounds like too much trouble. There should just be a developer option in the browser, grrrrrr.

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• Installing Intel Rapid Storage Drivers makes my eSATA Drives act weird

  - by Filip Ekberg

  I have a HP 8530w Elitebook this Laptop got an eSATA port which I want to plug my LaCie d2 Quadra V2 1TB harddrive into. It all works well on a fresh install of Windows 7 without the Intel Chipset drivers installed. However when I install the Intel Rapid Storage drivers or the Intel Matrix software my drive seems to "disconnect" when I use it to much. I have a lot of Virtual PC's on the drive and when I start them the disk somewhat disconnects. What could cause this?

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• Tape Storage - How do I setup a tape backup system for use with my NAS

  - by John Himmelman

  I currently have a QNAP NAS with a raid 5 config (~600gb storage) but don't have a reliable backup solution. I've heard great things about tape backup systems (reliability, durability, etc..). How can I go about setting up a tape backup system? The tape drives seem very expensive (1k+ for a decent one, more than the price of my NAS). What are the important specs to compare and features to take into consideration? Edit: Does anyone have links to some good resources? There is a ton of articles, guides, and sites on this subject, not sure where to start.

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• Setting default version on Azure Blob Storage?

  - by Erik

  What is the easiest way, without having to create your own utility, to set the default service version to the latest in Azure Blob Storage ? http://msdn.microsoft.com/en-us/library/windowsazure/dd894041 There is basically nothing to be set in the Azure portal and I am having a difficult time finding working utilities to use for Azure. For some reason Azure is defaulting to the oldest version which does not send things like the http range header for example. Any utility that can do this ? Thank you.

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• Windows Storage Server 2003 R2 RDP Disconnection

  - by Antitribu

  I am unable to remote desktop to our Windows Storage Server 2003 R2 machine. There are a few people about with similar issues but no answers around. Symantec End Point is installed but no network protection. Using rdesktop in Linux I receive: ERROR: send: Connection reset by peer NOT IMPLEMENTED: PDU 12 ERROR: Connection closed Where the "PDU XX" number changes on each connection. In windows using the latest mstsc I receive: The connection was lost due to a network error. Try connecting again. If the problem persists, contact your network Administrator. Any ideas?

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• How does fail2ban 0.9 database storage actually works?

  - by Arantir

  Fail2ban 0.9 introduce database storage to save bans on restart. But I can't find out the actual mechanism of it work. There is dbpurgeage parameter which controls lifetime of old bans, defaults to 24 hours. As I see from code research, fail2ban saves a ban to the db with timeofban equals to the moment of ban being saved. Then every dbpurgeage period it removes all bans with timeofban < MyTime.time() - self._purgeAge, in other words removes all bans have been stored more than 24 hours ago. But what if an IP was banned for the month? Does all this mean that with dbpurgeage = 86400 after restart in 24 hours I will lost all bans longer than 24 hours? I just want that all my permanent bans will be preserved in any case.

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• Sharing external storage between different operating systems?

  - by CT

  I just received a Lacie 1TB external usb/firewire/esata drive. I have 2 machines. A macbook running osx 10.6 and a desktop running windows 7. I would like to rip my dvd collection to iso and store on my external. Right now I use my macbook's disk utility to rip dvds to iso. However my desktop is what is connected to my hdtv. I mainly just use the desktop for media. I'd like to format the external with a 200 GB partition for time machine backups and have the rest for storage. DVD iso are often above 8GB so that sort of eliminates FAT file systems correct? Do I have any options to be able to have my mac and pc both see the drive?

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• VMWare esxi 4.1 storage errors with MD3200

  - by Karl Katzke

  We're seeing some storage errors from the esxi logs relating to our MD3200. I'm sort of a VMWare noob and am not sure where to go from here because I couldn't find a lot of documentation on the VMWare website, and the forums didn't seem to have any posts about it with actual answers. Everything is working, but I'm trying to proactively troubleshoot this. sfcb-vmware_base|StoragePool Cannot get logical disk data from controller 0 sfcb-vmware_base|Volume Cannot get logical disk data from controller 0 sfcb-vmware_base|storelib-GetLDList-ProcessLibCommandCall failed; rval = 0x800E The ESXi boxes are connected directly via SAS to the controller on the MD3200. What do these errors actually mean, and what's a good path to start troubleshooting or solving them?

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• What is the easiest way to get MySQL's Archive Storage Engine working on CentOS 5.4

  - by tronda

  The Archive Storage Engine is not enabled by the default build of MySQL in CentOS/RHEL. I would like to enable it on our CentOS 5.4 server. My initial reaction was to modify the SPEC file for the SRPMS file, but this indicates that this might not be that easy. There's always the option to build from MySQL source, but I would prefer if possible to stay within the RPMS/Yum world. Does anybody have a successful approach to this by using RPMS/SRPMS/Yum? Some patches which makes this work flawless with SRPMS?

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• Triple Boot - With storage partition

  - by art

  I'm new to the multi-boot world, as i used to rely on virtualizing for running linux. Recently i moved to Dual booting Windows 7 and Ubuntu, with a storage partition for all my files where both operating systems could access them. Is it possible, to have 1 partition for 7, another for XP, another for Ubuntu, and a separate partition where the OS's can access my files? so 4 partitions on my hdd. and if there's a better way to go about this (or if its not possible), please let me know! thanks

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• HALEVT troubleshooting: VFAT usb storage device gets mounted with root:root user:group

  - by Nova deViator

  Hi, i'm banging my head for number of days around this problem. using Halevt for automounting, everything mostly works, but the only thing is that Halevt mounts external USB storage devices as root. So, as user i cannot write to files on them. Halevt gets run as halevt user on boot through /etc/init.d script. This is Ubuntu Lucid with Awesome WM. No GDM. Running halevt as user seem to not work (halevt runs but doesn't respond on Insert) I know HAL is deprecated and removed and i should probably write my own UDEV rules, but until then it seems there must a be simple hack that enables mounting VFAT/NTFS devices with specific uid/gid. this question/answer helps a lot, but not specifically to the above.

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• NetFlow Storage Calculator

  - by javano

  I am planning to deploy a NetFlow server (using NfSen/NfDump) for harvesting data from Cisco devices; Are there standard calculations or guidelines I can use to calculate my server requirements, specifically I need to plan for storage. Is there a way of knowing how much data I will collect per day for example, given N flows? Lets say one device has 10k flows per day, this is typically XYZ MBs, so I can scale this up? If not, how many flows are you guys and girls recording per day, and how much data is this generating? Hopefully we can generate an estimate from everyone else's figures! P.S. If it makes a difference, I'll be collecting from <= 50 devices max (non more than 50Mbps each).

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• How does the data storage work? [closed]

  - by Andres Adhi

  I am really new to the whole concept of Data storage, Domain, Server and everything else related to this. Can someone pleases explain what a Domain is? How are server part of the Domain and How are Database stored in the Server or Domain? How does a new server be able to connect to existing database server to get all the data needed. I tried to find this information in the web but I am not really finding a good resource. It may be because these is really basic information. I will really appreciate if someone can explain these concept in plain terms. Thanks in advance.

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• MySQL Server - Got error -1 from storage engine

  - by Bobby

  I am currently trying to restore a MySQL table from the .ibd file. I have been following the instructions on the MySQL reference manual on how to use DISCARD and IMPORT TABLESPACE to replace the .idb files. Discarding the tablespace returns no error and the file is deleted however IMPORTING the replacement .ibd file yields a "Got error -1 from storage engine" error. There doesn't seem to be too much information about what exactly an error -1 is. Does anybody have any further insight as to why an import table space isn't working?

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• How to present shared storage for MS Cluster Services running on vSphere 5

  - by MDMarra

  I've seen two approaches to handling the presentation of shared storage to Windows Server 2008 R2 cluster VMs on VMWare vSphere. One is the traditional method of carving out a LUN on your SAN and presenting it to both hosts through the Microsoft ISCSI software initiator. The other method is to make a vmdk on an existing LUN and attach it to both hosts and made it an independent disk so that it isn't affected by snapshots. Is one way the "correct" way, or are both viable? Is there any advantage or disadvantage to doing either?

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• VMWARE V2V migration without shared storage

  - by TheCleaner

  I would like to do the following: Take Physical box running w2k8r2 and Sql2008R2 and do a P2V on it to a 4.1 Enterprise licensed cluster. --no worries here, I can do that part-- Take the existing physical box that is freed up and install vmware hypervisor 5.0 on it. --again I can do this part-- Do a v2v migration of the VM created in step #1 above from the Enterprise 4.1 Cluster to the standalone host. They are NOT using shared storage. Step #3 is where I'm confused as to what my best option is. I found an article online talking about using Veeam FastSCP and just shutting down the vm on the cluster, removing it from inventory, copying the files over to the new host and then adding it to inventory. Is that the best way to accomplish this?

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• Unknown/unsupported storage engine: InnoDB | Mysql Ubuntu

  - by Kayle

  I recently upgraded from the previous LTS Ubuntu to Precise and now mysql refuses to start. It complains of the following when I attempt to start it: ?$ sudo service mysql restart stop: Unknown instance: start: Job failed to start And this shows in "/var/log/mysql/error.log": 120415 23:01:09 [Note] Plugin 'InnoDB' is disabled. 120415 23:01:09 [Note] Plugin 'FEDERATED' is disabled. 120415 23:01:09 [ERROR] Unknown/unsupported storage engine: InnoDB 120415 23:01:09 [ERROR] Aborting 120415 23:01:09 [Note] /usr/sbin/mysqld: Shutdown complete I've checked permissions on all the mysql directories to make sure it had ownership and I also renamed the previou ib_logs so that it could remake them. I'm just getting no where with this issue right now, after looking at google results for 2 hours.

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• Windows Storage Server 2003: Shadow Copy (VSS) enabled for volume, but Previous Version not visible

  - by Jaap

  Windows Storage Server 2003 We have Shadow Copy (VSS) enabled for one volume. However Previous Version tab is not visible on the server on properties dialogs on any file or folder on that volume. We don't want this tab to be visible on the clients, just on the server. I've checked the VSS settings and they're definitly enabled for the volume. I'm stuck! Do I have to install the client-software on the server? The folder \%systemroot%\system32\clients\twclient contains 3 empty subdirs (location copies from docs)...

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• Routers with USB plug to connect external storage

  - by sixtyfootersdude

  I am just about to buy a new wireless router. I want to be able to hook up a harddrive to it and let the harddrive serve the entire network. I will mostly be storing media and some backups on the drive. I know I could get some kind of NAS but I would prefer to just hook up one of my many unused hard drives directly to my router. It looks like d-link has several products that do this using shareport. If you were wanting to have network storage how would you do it? With a NAS? Using a router with a USB port. Are these systems robust? What router would you buy?

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