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• PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

  - by Vlad

  We will be expanding the storage for a PostgreSQL server and one of the things we are considering is using SSDs (Intel 520 Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect improved performance, however we are concerned about longevity since our database usage pattern is quite write-heavy. We are also concerned about data corruption in case of power failure (due to SSDs write cache not flushing properly). We currently use RAID10 with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380 G6 server with P410 Smart Array Controller and BBWC. What makes more sense: upgrading the drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?

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• Dedicated server configuration - some tips -Xenserver/Debian

  - by Sanjay S

  I am migrating from a vps based hosting to a dedicated hosting (8GB RAM/1TB HD). I need to run multiple Drupal and Ruby based applications? what would be the recommended configuration. I was thinking of two options. 1) Install multiple Debian os on top of Xen (like VPS). Each may be 2GB Memory and run Drupal and Ruby and MYSQL on separate partitions . 2) Install one instance of Debian. and Install Drupal (Apache, php) Ruby (lighttpd, ruby) ,MySQL all in the same partition I was little worried that option 2 could lead to some performance issues later..

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• Dell R510 vs R710

  - by AX1

  Hello, the Dell R510 and R710 can both hold regular configurations (e.g. X5650, 24 GB RAM, etc.) and these usually come out to about the same price. Is there a particular reason why one would choose the R510 over the R710 or vice versa? There really appears a lack of differentiating factors. The only 'major' factor I found, which doesn't apply to me though, is that the R510 can hold up to 12 3.5in HDDs while the R710 (which is slightly more expensive) can only hold up to 6 3.5in HDDs. Maybe you guys have some input and bought either of these machines (or both) to shed some light on other differences and why someone should choose one over the other as the pricing is pretty much the same with my configuration. Thanks!

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• Setting up a Windows Server 2008 R2 DC + Fileserver : native or virtual?

  - by user126890

  I want to deploy a new DC + Fileserver using Windows Server 2008 R2 SP1 Standard Edition on a Dell PowerEdge R410 and iSCSI storage for a small business (~30 people). Should I install the system native on the server or use a virt layer? I don't have a budget for virtualization so i gotta go with something free... What's a better working routine, taking snapshots of vm's or taking backups (Acronis/CloneZilla) of systems? If I use a virt system, I need a GUI for some people in the business to reset the system to a earlier state in emergency situations. I wanted to install phpVirtualBox once but never finished, is it suitable in a productive environment? server specs: Intel Xeon E5620 CPU (2,40GHz, 4C, 12MB Cache) 8GB RAM Dual Rank LV RDIMMs 1333MHz 2x 1TB SATA 7,2K 3,5, RAID1

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• error: cannot fork() for status: Resource temporarily unavailable (git)

  - by Elnaz Shahmehr

  when I want to do something: add , remove, pull , push in github, I just have this error in my terminal Thanks in advance! selnaz:iOS-Tidinfo Lnaz$ git add . error: cannot fork() for status: Resource temporarily unavailable fatal: Could not run git status --porcelain fatal: git status --porcelain failed fatal: git status --porcelain failed fatal: git status --porcelain failed fatal: git status --porcelain failed fatal: git status --porcelain failed fatal: git status --porcelain failed Edit: selnaz:iOS-Tidinfo Lnaz$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 256 pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 709 virtual memory (kbytes, -v) unlimited Edit2 selnaz:iOS-Tidinfo Lnaz$ ps xfu | wc -l ps: illegal option -- f usage: ps [-AaCcEefhjlMmrSTvwXx] [-O fmt | -o fmt] [-G gid[,gid...]] [-u] [-p pid[,pid...]] [-t tty[,tty...]] [-U user[,user...]] ps [-L] 0

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• Windows Resource Monitoring Programs

  - by Sal

  I work at a small tech start up managing websites with our own in house server side code. (In production, we use Windows Server 2008 boxes, running Java 6. In our dev boxes, we use Windows 7 running Java 7.) Recently, we had an issue where some of our boxes in production failed, and we didn't have means of trouble shooting, since we keep little to no monitoring logs about a given box's CPU/memory/RAM usage, etc. So, I'm wondering if there is some commercial/freeware that's the standard for performance monitoring/logging. Essentially, I'm just looking for an analytics system that is similar to the Windows Task Manager or the Resource Monitor, that serializes all of its data periodically. Ideally, I'd like to find a program that's also extensible, in case I'd like to add addition monitors in the future.

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• SQL Server 2008 Hardware Recommendation;

  - by Jay

  Hi,I work for a large fortune 500 company. We have several SQL 2005 Servers running on DELL Poweredge 2950 with 8 GB RAM and 4 CPU's. Storage is DMX RAID 10. We are in the process of migrating to sql 2008. We are planning on consolidating multiple sql 2005 into single SQL 2008 Server.If anyone can suggest hardware I would appreciate. We have looked at DELL R710, I was wondering if there are other servers that are good for running SQL 2008. Thanks

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• Server Configuration / Important Parameter for 500Req/Second

  - by Sparsh Gupta

  I am configuring a server to be used as nginx server for a very heavy traffic website. It is expected to receive traffic from a large number of IP addresses simultaneously. It is expected to get 500Req/Second with atleast 20Million unique IPs connecting it. One of the problems I noticed in my previos server was related to iptables / ipconntrack. I am not aware of this behaviour and would be glad to know which all parameters of a ubuntu / debian (32/64) bit machine should I tweek to get maximum performance from the server. I can put in a lot of RAM on the server but mission critical task is the response times. We ideally dont want any connection to be hanging / timing out / waiting and want as low as possible overall response times. P.S. We are also looking for a kick ass freelancer system admin who can help us figuring / setting this all up. Reach me incase you have some spare time and interested in working on some very heavy traffic website servers.

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• Fan twitches and LEDs blink when computer is plugged in

  - by Zifre

  I just finished assembling a desktop for the first time. The specs are: Gigabyte GA-H55M-S2H motherboard Core i3 530 CPU 4 GB DDR3 RAM 1 TB SATA hard drive 500 Watt PSU As soon as I plug in the computer, the "phase LED" starts blinking orange and the system fan LED blinks while the fan "twitches". This continues until about three seconds after I unplug the computer. This worries me a lot because I haven't even turned the computer on and it continues even after there is no power. I did make sure the PSU is on the proper power setting. What is causing this and how can I fix it? Is the motherboard dead?

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• MySQL is killing the server IO.

  - by OneOfOne

  I manage a fairly large/busy vBulletin forums (~2-3k requests per second, running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96

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• In MySQL 5.1 InnoDB, does the maximum length of a VARCHAR affect secondary index size?

  - by e_tothe_ipi

  Assuming the data is the same either way, does the maximum length of the VARCHAR affect the space usage of a secondary index? Does InnoDB use fixed length records for indexes? Assume that we're talking about MySQL 5.1, with the InnoDB COMPRESSED table format and that the field in question is defined as a VARCHAR with some length less than or equal to 255 (so that it uses only one byte for the offset). Here is the use case: I have a server with a very large table (several gigabytes). One of the fields is currently VARCHAR(7). We need it a little longer and we are thinking of making it VARCHAR(255), but we are worried that it bloat the index.

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• Postfix performance

  - by Brian G

  Running postfix on ubuntu, sending alot of mail ( ~ 1 million messages ) per day. loads are extremly high but not much in terms of cpu and memory load. Anyone in a similiar situation and know how to remove the bottleneck? All mail on this server is outbound. I would have to assume the bottleneck is disk. Just an update, here is what iostat looks like: avg-cpu: %user %nice %system %iowait %steal %idle 0.00 0.00 0.12 99.88 0.00 0.00 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 12.38 0.00 2.48 0.00 118.81 48.00 0.00 0.00 0.00 0.00 sdb 1.49 22.28 72.28 42.57 629.70 1041.58 14.55 135.56 834.31 8.71 100.00 Are these numbers in line with the performance you would expect from a single disk? sdb is dedicated to postfix. I think it is queue shuffling, from incoming-active-deferred More details from questions: Server: Quad core Xeon(R) CPU E5405 @ 2.00GH with 4 GB ram Load average: 464.88, 489.11, 483.91, 4 cores. but the memory utilization and cpu is minimal Postfix instances between 16 - 32

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• TrueCrypt: Open volume without mounting

  - by Totomobile

  I have a corrupt TrueCrypt volume. When I try to mount it, the password is fine but I get an error: hdiutil attach failed no mountable file systems. I just need to open it without TrueCrypt trying to mount it too, so I can use that partition in a data recovery program. Also it's just an image file volume. I have read the documentation here: http://www.truecrypt.org/docs/?s=command-line-usage But I can't figure out which switch I need to use to only open an image and not mount it. I am using the Mac version, and I have set up an alias for the TrueCrypt shell command, so I can just type: truecrypt -t -v - ?? [][]..

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• My dedicated server keeps getting very slow that it fails to load the application

  - by server

  I have an application running on Windows Server 2008, running IIS 7.5, SQL Server 2008, 4GB RAM from brinkster. The problem is, every couple of days I get the same 10,000 calls that the system is very slow, and its not operating properly, then after 30 minutes of that it just fails to load. I try to access the server from the remote desktop connection but I can't access it. The only way it I can get it working again is to call the support at brinkster and have them do a manual reboot of the server. After that it works well for some time, and the it re-crashes after some time. Support over there, are not helping a lot.

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• What and why is my swap space used under linux

  - by Fabian

  on my linux system I get these stats from top: Tasks: 155 total, 1 running, 153 sleeping, 0 stopped, 1 zombie Cpu(s): 1.5%us, 0.3%sy, 0.0%ni, 97.4%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8177180k total, 2025504k used, 6151676k free, 44176k buffers Swap: 7999996k total, 495300k used, 7504696k free, 637612k cached There it shows me that my system is using 495Mb of swap. Why is this so? 6Gigs of ram are free. And if I would disable swap entirely the system would also work. Any explanation what the number really shows or who is swapping?

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• Windows Server Configuration with Exchange, SQL Express and IIS

  - by Reafidy

  In our small office we are currently running a standalone tower server with WS 2008 R2, SQL Express and IIS. This server is going to be decommissioned and scrapped as its old and very noisy. We are going to purchase a new server with WS 2012 Standard and a heap of ram. It will still be a standalone server so it will be a domain controller, have SQL Express and IIS installed. We intend to install the hyper-v role and host a second virtual server to distribute the load. We are a small company and have only 15 staff members so its not a huge load on the server. Can a single server handle this type of installation, we don't want to purchase two servers. If so how should it be configured with regard to which software packages should be virtualized(if any). Redundancy is not a huge issue for us.

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• x11vnc is slow, but using only 10% of available bandwidth

  - by mmm

  I am using x11vnc over 15Mbit/s network with 20ms latency. When the screen is changing a lot x11vnc is slow - for example when I switch a tab in a browser, it takes almost two seconds until the view is fully redrawn. The strange thing is that max connection speed of x11vnc is even during slow redrawing only about 10% of the available bandwidth. Why is x11vnc not using available bandwidth to speed the redrawing up? For example scp is using 100% of available bandwidth without problems. How can I identify what is the bottleneck for x11vnc on my system? So far I think: 10% network usage = network is not a bottleneck fb read rate: 601 MB/sec = reading fb is not a bottleneck Any ideas how can I further profile x11vnc and find out what is causing a slowdown? For example is there any switch for x11vnc to show how much data it is handling and how long it takes to grab a screen, process and compress it and send it over the network?

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• Linux halts every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• Why are they putting "processors" on hard drives?

  - by Celeritas

  What does it mean when they have a processor on the hard drive, how does it work, and what benfit does it have? I don't understand - the CPU is the processor and the hard drive transfers it's contents to RAM. Do have additional processors, preprocess the data some how? Here's some examples Western Digital WD Black WD1002FAEX 1TB "Dual processor speed" NETGEAR ReadyNAS 312 2-Bay Diskless Network Attached Storage "Dual-core Intel 2.1GHz processor and 2GB on-board memory" and routers now have processors too, why's that nescecary? I guess it sort of makes sense - some logic needs to happen for the packets to be read in to know which ports to send them out on, but why did old routers not need them? Example or wireless router with processor: "Dual-core processor"

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• Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

  - by Toby Hede

  I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream My passenger setup is: passenger_min_instances 2; passenger_pool_idle_time 1200; passenger_max_pool_size 20; I have done some digging, and it looks like the CPU gets pegged. Memory usage seems fine passenger_memory_stats shows at most about 700MB being used, but CPU approaches 100%. is this enough to cause this type of error? Should i bring the pool size down? Are there other configuration settings I should be looking at? Any help appreciated Other pertinent information: Amazon EC2 Small Instance Ubuntu 10.10 Nginx (latest stable) Passenger (latest stable) Rails 3.0.4

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• Adobe Master Collection CS3 wont run on my Windows 7 64bit

  - by Jeremy

  I have a brand new HP p6230y. My first step after booting it up was to install Master Collection. It installs fine, but when I go to run each of the applications, and they all behave differently. I have re-installed twice already. Photoshop opens, but freezes. Acrobat tells me that I need to reinstall. Nothing else even opens (no freezing, no process in taskman). Any Ideas? HP p6230y RAM: 8gigs CPU: AMD Phenom2 x4 810 (2.6ghz) OS: Windows 7 Home Ultimate 64bit

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• page allocation failure - am I running out of memory?

  - by mfriedman

  Lately I've noticing entries like this one in the kern.log of one of my servers: Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20 This is what I'd like to know: What exactly does that message mean? Is my server running out of memory? The swap usage is quite low (less than 10%), and so far I haven't noticed any processes being killed because of lack of memory. Additional information: The server is a Xen instance (DomU) running Debian 6.0 It has 512 MB of RAM and a 512 MB swap partition CPU load inside the virtual machine shows an average of 0.25

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• Virtual Machine Manager 2012 CPU Average

  - by Grant

  What exactly is the CPU Average field in VMM 2012 showing me? I'm running Server 2008 R2 with VMM 2012. My server has 2x16 core CPUs installed. An example virtual machine has 4 virtual processors, and shows 20% CPU usage. Is that: 20% of the entire system's available CPU power? 20% of 4 of the 32 core's CPU power? 20% of one core's CPU? (in which case it could go as high as 400%) Something else entirely? How can I tell how much of the entire system's CPU power is being used (all 32 cores)? Edit: Well, I can tell for sure it's not 20% of the entire system's CPU power - since the entire server's CPU averages add up to well over 100% right now.

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• Hardware Raid Card Reviews with SSDs

  - by Nalandial

  Yes I realize there are several questions about this but none of them seem to have the answer I'm looking for. I have two SSDs and am looking to buy a purely hardware raid card for them; however, I can't seem to find any reviews that have specifically tested hardware raid cards with SSDs rather than testing the SSDs themselves. I'm looking for a review because I'm assuming that for example: 100% gain with two 7200rpm drives doesn't necessarily mean 100% gain with a pair of SSDs, since there would be higher speeds, meaning more throughput, meaning more processor/memory usage for the card. If this assumption is wrong then that's fantastic; however if it's true, I am quite sad and would really appreciate any advice or reviews you can find. Thanks in advance!

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• Q8300 Core-2 Quad vs X3360 Xeon

  - by alchemical

  I'm looking at this ABMX server, and trying to decide on the CPU. I'm purchasing 2 servers, to be used as dedicated web and DB servers for a web site that has low traffic now but could ramp up quickly. Just trying to decide if it is worth about $200 more (per server) for the Xeon vs the core-2. Passmark rates them at 3567 and 4153, which didn't seem that different. I'm not planning at this point to need virtualization. I did hear rumors that Xeon stands up better in a 24/7 server environment, but heard others say there wasn't that much difference. Planning to run Windows Server 2008, likely the R2 release, with 8GB RAM.

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