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• On Server Disk Storage VS SAN Storage

  - by Justin

  Hello, I am looking at buying three servers, and trying to figure out which storage solution makes the most sense in terms of performance and cost. Total budget is around: $10,000. OPTION 1: Dell servers with RAID 10 (4 Drives) each 7200RPM SAS 500GB, for a total capacity of 1TB. Each server is approx: $3000. Total storage then across all three servers is 3TB. OPTION 2: Same Dell servers with a cheap single drive no RAID for $2000 and go with a centralized SAN solution. The biggest problem is that I haven't been able to even find a SAN solution that is a reasonable price. Dell entry level storage servers are like $15,000. I am thinking just iSCSI, not fiber (too expensive). What do you guys recommend?

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• Mysql out of disk space

  - by Paddy

  I have just finished developing a rails app which has a mysql db as a backend. The app is meant for high traffic and will store lots of information. I am planning to set up my own web server and host the site from it. If in future my disk space runs out i would want to expand by adding more space. But say if my mysql database is housed in my /disk0s1 and by adding a new drive i have more partitions (and hence more disk space), how then would i extend my database to store information on those partitions too, and at the same time prevent any information from being written on the original partition. Should i go for multiple databases? if so how? If i went for a hosting solution i wouldn't be bothering about this as i would just have to worry about making payments for the extra space :) I always wondered how space is added on-the-go by these webhosts. Is there any specific mysql configuration that i have to make?

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• Laptop LCD Screen Flickering

  - by BSchlinker

  I recognize this is most likely not a software error and likely lies in one of the hardware components. However, about 3 months ago I replaced the LCD screen on this laptop. The company which I bought it through provided a 12 month warranty. Before I contact them, I would like to verify that the problem is most likely the LCD screen and not the inverter. Any comments? I recognize its impossible to diagnose hardware remotely, but it would be nice to know if there is a high probability it could be a component other then the LCD screen.

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• which factors determines the speed of a processor? [closed]

  - by Deb

  I think that clock rate of processor determines the speed of core, in my case it is 1.86GHz. But If I am not wrong, it also determines that how much energy it will consume. If you have more frequency then more power it will consume. I choose Power Saver scheme to increase my battery life, however it reduces my core speed to half of the actual speed. I understand this happens because of SpeedStep, but I don't see any slowdown of my computer. So my problem is why we have such high frequency cores as it uses too much power. We can use low frequency cores. Actually I get confused between the two terms Speed of the processor and its frequency. So how much important is the frequency of core in case of any processor.

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• hp smart array lock up code 0x15, what is that? (or where can I get a list of descriptions of HP smart array controller lock up codes)

  - by user47650

  Hi, I've had a couple of Dl180 6g boxes hung over the last week, each have a P410 smart array controller. upon reboot the server has indicated that a controller failure event occurred and the previous lock up code was 0x15 - the server rebooted without issue. However there was nothing in the IML log, but the ADU report provided the following; Trap Address High Or Post Results Lockup Reason Or Post Error RIS Updates Or Post Error Detail Firmware Version Trap Address Low 0x8087 0x0015 0x0000033e 0x015e 0xd65c any suggestions on what that code is, my google fu failed. And hp support have not responded with any detail as yet.

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• Alfresco Community Edition Consultants

  - by Talkincat

  I am in the process of putting together an document management system based on Alfresco Community 3.2r2. Because Alfresco will not allow its partners to work with the Community edition, I have found it devilishly tricky to find consultants that specialize in Alfresco to help me with this project. Can anyone point me in the direction of someone that can help me get this system up an running? I will mostly need help with integrating Alfresco with Active Directory (LDAP passthrough, user/group sync and SSO) and performance tuning the system. Any help is greatly appreciated.

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• Are Mac Minis suitable for a proper desktop computer?

  - by alex

  I've read about a lot of people using their Mac Minis as a file server, or media centre or something similar. Does the mini function alright as a standard desktop PC? The Mac will be used primarily for web development, that is, it will need to run Coda, Photoshop, possible Firefox and Safari at the same time. So it will need suitable performance. Or am I better off getting an iMac? I though the mini looked like a good option because: cheaper I already have a keyboard, mouse and 24" monitor I could use a KVM between the mini and PC Also, does the mini support multiple monitors? Thanks

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• Which CPU for SQL Server machine (Xeon, i5, i7, AMD Phenom)?

  - by Tony_Henrich

  I am going to build a full height server machine to be used for SQL Server 2008 64bit. I have $400 to spend for a CPU. Which CPU should I get among i5, i7, Xeon and Phenom in terms of performance. There are so many options and I am out of touch with the latest stuff. All I know I want something fast and works with DDR3 fast memory and works with some kind of fast system bus. I don't care about overclocking, 3D & gfx benchmarks. The machine is not used for games and gfx apps. Any recommendations?

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• Apache out of memory on

  - by Sherif Buzz

  Hi all, I have a VPS with 768 MB RAM and a 1.13 GHZ processor. I run a php/mysql dating site and the performance is excellent and server load is generally very low. Sometimes I place ads on Facebook and at peak times I can get 100-150 clicks within a few seconds - this causes the server to run out of memory : Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp .... And all users receive an error 500 page. I am just wondering if this sounds reasonable or not - to me 100-150 does not seem to be a number that should cause apache to run out of memory. Any advice/recommendations how to diagnose the issue highly appreciated.

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• scalability with nginx, passenger, ruby on rails setup

  - by Dani Cela

  Hey guys I had a question regarding scalability for my RoR application. We have been optimizing our application over the last few days and after running blitz.io, notice that our application times out after maybe 1000 hits in 30 seconds we experienced massive timeouts. In the 1 minute test apparently 74% of users would have timed out. Look at the performance of my website: http://blitz.io/report/1c8eb2f395a5eadeabd62fd831ada9e5 Not saying that our website will in any way experience this now, but I wish to design the infrastructure to handle this. What is normally done in this situation? Currently we have one web server and one database server. Would load balancing be the route to go?

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• What proportion of DBA skills are platform-independent?

  - by Arkaaito

  Problem: we've grown to the point where we need a real DBA. Real DBAs are hard to find. Possible solution: I know someone with extensive experience (currently working on MSSQL) who is looking for a new DBA job. He might be willing to consider working for a MySQL shop (I haven't asked). Snag: I don't know to what extent MSSQL DBA skills map to MySQL DBA skills. I'm a developer, so I know enough about MySQL to develop apps which use it (including the basic performance-tuning, index selection, etc.), do schema design, and perform simple utility tasks (backup with mysqldump, scripting, etc.). I don't know anything about MSSQL. Nor do I actually know much about the boundaries of the DBA role. Can anyone with more experience - perhaps as a DBA - weigh in on this? Are there enough similarities between MSSQL and MySQL that it's worth asking a MSSQL DBA if he'd be interested in applying for a MySQL position?

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• pslist causes security audit log failure on non-administrative user account

  - by Woot4Moo

  The user has RX privs. This event consistently arises in the security logs. How can this be resolved? Or what is the underlying issue here? Some additional information the user has local login disabled and log on as a service enabled. Failure Audit Category: Object Access Event ID 560 Object Server: Security Object Type: File Object Name: Pg_control Image File Name: xx/xx/xx/xx postgres.exe Primary User name: my_User Object Open: Object Server: Security Object Type: Key Object Name: \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Performance Handle ID: - Operation ID: {0,26727190} Process ID: 2492 Image File Name: C:\Program Files\tomcat\webapps\myApp\bin\win32\pslist.exe Primary User Name: my_user Primary Domain: KFHFTZ03 Primary Logon ID: (0x0,0x178D9) Client User Name: - Client Domain: - Client Logon ID: - Accesses: READ_CONTROL Query key value Set key value Create sub-key Enumerate sub-keys Notify about changes to keys Privileges: - Restricted Sid Count: 0 Access Mask: 0x2001

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• Fiber Channel Loop vs Point to Point

  - by RandomInsano

  So, I'm playing with a couple of QLogic QLA2340s connected directly together. I've got options here to either have them act as a loop, or in point to point mode. What's the difference if I'm only going to have two machines connected together? Is point-to-point more efficient? The firmware has an option to prefer loop, then fall back to p2p. Anyone have any idea if there are performance benefits or drawbacks? It's pretty hard to find that information.

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• Linux Virtualization Options on EC2

  - by recampbell

  I need to subdivide EC2 (or perhaps other cloud provider) instances. I know you cannot run a full virtualization stack on another. For instance a Xen guest cannot host a VirtualBox guest. So this means I am left with operating system-level virtualization. EC2 kernels are only publishable by select vendors, so you cannot upload the custom kernels required for OpenVZ or Vserver. For Linux, I think this leaves me with lxc (on Ubuntu 9.10), User Mode Linux, or qemu. I'm having a hard time finding comparisons between them. Performance is a concern, as is the ability to provide SMP to the guests. I would also like to use COW/sparse roots to reduce guest provisioning. My question is, what are the trade-offs between these options?

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• keyboard key mapping gone haywire

  - by arvind

  I have a Sony VGN-CR353 running Windows 7 Ultimate. For typing purposes I use two keyboards: The Inbuilt Laptop Keyboard A Standard External Desktop Grade USB Keyboard Since yesterday, My inbuilt keyboard's keys have gone all awry. This is Similar to http://superuser.com/questions/11537/keyboard-keys-not-working-or-resulting-in-the-wrong-key But the high point is that the external keyboard is working just fine. I have already tried System Restore, Reinstalling Keyboard Drivers etc. but to no avail. This is really bugging. Please Help. Thanks in Advance.

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• Apache and mod_authn_dbd DBDPrepareSQL error

  - by David Brown

  I am running Apache 2.2.17 on Suse Linux 11. I have installed the mod_authn_dbd module to allow authentication using a MySQL database. Simple digest authentication works absolutely fine using the following directive: AuthDBDUserRealmQuery "SELECT loginPassword FROM login WHERE loginUser = %s and loginRealm = %s" However, I would like to both generalize this statement and prepare it for performance and security reasons. Thus, I used the following directives instead: DBDPrepareSQL "SELECT loginPassword FROM login WHERE loginUser = %s and loginRealm = %s" digestLogin AuthDBDUserRealmQuery digestLogin These directives generate the following errors: [...] [error] (20014)Internal error: DBD: failed to prepare SQL statements: [...] [error] (20014)Internal error: DBD: failed to initialise Why does my actual SQL statement work when used directly, but not when I try to prepare it? (Note I have tried using '?' and '%%' in place of '%', to no effect.)

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• Vertex 2 SSD is running faster than my Vertex 3 SSD?

  - by Kairan

  I used Acronis Disk Director to do a direct clone of my C:\ windows 7 x64 drive from my Vertex 2 to my new Vertex 3 SSD (Just to show the drive software winstall everything is identical.) I ran a performance test on Windows using the Windows Experience Index. The rating I am receiving when booting on the Vertex 2 is 7.5 While I am getting only a rating for the Vertex 3 of 6.9 My understanding is that the read/write speeds of the Vertex 2 is only up to 250MB/sec while the Vertex 3 is up to 500MB/sec. Copying a single file (3GB in size) from the Vertex 3 to itself was getting speed of approx 70-80MB/sec This speed is no better (maybe worse) than what I got from the Vertex 2 I am connected via the SATA 3 port on the motherboard, using an SATA 3 cable Is this issue caused by the drive cloning? Do I have a bad SSD?

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• ADSIEdit freezes gettings properties of a group with hundred of thousands members

  - by ixe013

  Doing performance testing on an AD-LDS (Server 2008 R2 64 bits), we created a milion user in a single OU. We also created a single group object and made those milion users member of that group. When we try to list the milion of users ADSIEdit times out with an error message saying it cannot display that many users. Fine. But if we open the properties for the group, ADSIEdit freezes, eating up all available memory and CPU trashing (nearly 60M page faults in under an hour). AD-LDS (running on another computer) is barely hitting the 1% CPU mark, servicing other ldap requests as if nothing were. We can throw more memory at the problem, but more users will have to be managed one day and we will be back at square one. Is there a way to set a limit in ADSIEdit so that it will not hang the computer when retreving a very large multi-value object ?

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• How does one calculate voltages for overclocking?

  - by TardisGuy

  So, all I know is voltage and clock have something to do with each other. Unstable if too low voltage Too high voltage, and too much heat. or higher voltage + lower clock may heat less than that voltage at higher clock. The reason why im asking is because if I can learn how the power vs speed works, Then i might be able to project some kind of thermal curve to find out where my perfect overclock might be (without 50 burn-ins) But, as is apparent im sure. I have no idea what im talking about. If anyone can help me learn more about this; throw me a page, a macro, whathaveyou I will bow before your awesomeness and... Mail you a phantom hand written thank you letter. Some clarification Rev 1 What im trying to learn: is how much power a cpu is using with measurements (Core Voltage) vs (Clock speed) - It would answer the question: Would a 1.4v core @ 4.0Ghz use as much power as a 1.4v core @ 3.0Ghz?

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• Are there any tools for monitoring individual Apache virtual hosts in real-time?

  - by Dave Forgac

  I'm looking for a way to monitor and record Apache traffic, separated by virtual host. I am currently using Munin to capture this and other data for the entire server however I can't seem to find a way to do this by vhost. This link describes using a module called mod_watch which is apparently no longer in development: http://www.freshnet.org/wordpress/2007/03/08/monitoring-apaches-virtualhost-with-munin/ The file that is listed as being compatible with Apache 2.x is reported to have problems with missing vhosts an reporting data correctly. Does anyone know of a reliable way to determine real-time traffic per vhost? If I can find this it should be easy enough to write a new Munin plugin. Edit: What I'd really like to see is something similar to the Apache server-status scoreboard page with the number of connections / requests separated by virtual host. This would give me the ability to check which vhost may be experiencing a spike in traffic in real time and would also provide the data needed for a Munin module (or some alternative performance monitoring / analysis system.)

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• The difference between desktop-series HDD drives and server-series

  - by FractalizeR

  Hello. What are the main differences between desktop-series hard disks and server-series? The obvious things I can see are: durability (server hardware mostly more qualitative and have more warranty) and power consumption (server hardware more focused on performance, than on power economy). Also server disks are usually a little faster, but it seems, that it is not always the case. May be there are some other reasons, that make you choose server-oriented series (Seagate ES drives, for example) over desktop-oriented ones (Seagate Barracuda series)? What are they?

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• Windows FAT/NTFS Low-Level Disk Viewer (Norton DiskEdit alternative)

  - by Synetech inc.

  Hi, One of my most valuable software tools has always been Norton DiskEdit from Norton Utilities/Symantec Systemworks. I have used it for years for so many things, including, but not limited to learning file-systems. I am now in search of a similar tool that can let me view FAT and NTFS disks at a low and high level under Windows. I have seen Runtime Software’s DiskExplorer, but unfortunately, it is limited in a number of ways, particularly annoying is that it does not really let you view the disk as structured (it does not let you see directory entries from a directory that is fragmented like DiskEdit can without doing a too-exhaustive scan which doesn’t even work for FAT partitions that have cluster sizes <4KB). Does anyone know of a Windows alternative of a Norton DiskEditor? Thanks a lot.

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• Migrating Shared Hosting and Email

  - by Chrisc

  Hey Guys, I know there has already been a question that has been posted here about migrating shared hosting accounts, but wanted to get a second opinion on my plan to move hosting providers. My business is moving our shared hosting account (hosting and email) to a new provider, and would like to have minimal downtime. Here is our current plan: Create a backup of our old site Upload our site to the new host Set up duplicate email accounts with our new host Change the name server records on our domain to point to our new host Leave our old site up long enough for DNS records to propagate completely. I'm hoping this should result in little downtime for both website and email. Because of the volume of high-importance emails our company receives on a daily basis downtime is very expensive and not tolerated. Thanks, Chris

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• Can't find instructions how to use Windows 7 drivers on Windows Server 2008 R2

  - by Robert Koritnik

  Maybe I should post this to http://www.serverfault.com. Windows 7 comes with all sorts of signed drivers so there's high probability that all drivers for your machine will be installed during system setup. On the other hand Windows Server 2008 doesn't event though it's practically the same OS when it comes to drivers. But I know that this has a very good reason. It's a server product, not a desktop one. But the thing is that many power users and developers use server OS on their workstations which are normally desktop machines and would need Windows 7 driver spectrum... Question I know I've been reading about some trick on the internet that first installed Windows 7 on the machine, than do something to get either all Windows 7 driver collection or just those installed, and then install Windows Server 2008 and use those drivers. The thing is: I can't seem to find these instructions on the internet any more. If anybody knows where these are please provide the link for the rest of us.

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• Can't find instructions how to use Windows 7 drivers on Windows Server 2008 R2

  - by Robert Koritnik

  Windows 7 x64 comes with all sorts of signed drivers so there's high probability that all drivers for your machine will be installed during system setup. On the other hand Windows Server 2008 R2 doesn't. Event though it's practically the same OS when it comes to drivers. I know there's a very good reason for this difference. It's a server product, not a desktop one. But the thing is that many power users and developers use server OS on their workstations which are usually desktop machines (a bit more powerful though) and would benefit from the whole driver spectrum that Windows 7 offers... Question I know I've been reading on the internet about some trick where you first install Windows 7, than do something to get either all Windows 7 drivers or just those installed, and then install Windows Server 2008 R2 and use those drivers of Windows 7. The thing is I can't find these instructions on the internet any more. If anybody knows where they are please provide the link for the rest of us.

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