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• RDP Connection to Windows 7 stays really slow

  - by Pavlo

  I have an Issue with connecting to Windows 7 via RDP. I can open an RDP Session, but regardless of any settings, the responce times are really long. This in particulary is the case when opening a web page in a browser. I've tried IE, Firefox and Google Chrome. I also use RDP connection to a Windows 2008 Server from the same client machine, and the speed is very normal with all features turned on. We have Gigabit Ethernet here. So I think it can not be the client's fault. What concerns Windows 7 Machine, I've tried shutting all the sraphic features off and turning the color levels to 256 colors. Result - the same. If I work locally on the machine - I can not see any lags. What else have I tried: Using old RDP 5 Client from Microsoft Setting network autotuninglevel as seen here Do You have some ideas? Thanks in advance! Update the problem seems to be with rendering window contents. All the window borders and pannes are rendered pretty quickly, but the content shows up very slowly. Also mouse movements are recognised by the Win 7 box only after some period. Are there some hidden settings in the RDP, where one could turn some advanced features off or turn some caching on? I use Bitmap Caching, but this apparently doesn't help.

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• SQL Server 2005 SP3 Express Backups Incredibly Slow

  - by Adam Robinson

  I'm attempting to troubleshoot an issue with one of our customers who's using SQL Server 2005 SP3 Express to house their application data. The automatic backups that we perform when upgrading our application are timing out after 30 minutes, and I've been sitting and watching the backup take place in SSMS for about 20 minutes now and it's only gotten to 30%. The database is only slightly over 1GB, so I'm baffled as to what could be causing this sort of horrible performance. The machine is a 1.87GHz Xeon with 3GB of RAM running Windows Server 2003 R2. While that's hardly a powerful box, this seems ridiculous. Does anyone have any idea why these backups could be taking so long and, more importantly, how I can do something about it?

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• Apache on Win32: Slow Transfers of single, static files in HTTP, fast in HTTPS

  - by Michael Lackner

  I have a weird problem with Apache 2.2.15 on Windows 2000 Server SP4. Basically, I am trying to serve larger static files, images, videos etc. The download seems to be capped at around 550kB/s even over 100Mbit LAN. I tried other protocols (FTP/FTPS/FTP+ES/SCP/SMB), and they are all in the multi-megabyte range. The strangest thing is that, when using Apache with HTTPS instead of HTTP, it serves very fast, around 2.7MByte/s! I also tried the AnalogX SimpleWWW server just to test the plain HTTP speed of it, and it gave me a healthy 3.3Mbyte/s. I am at a total loss here. I searched the web, and tried to change the following Apache configuration directives in httpd.conf, one at a time, mostly to no avail at all: SendBufferSize 1048576 #(tried multiples of that too, up to 100Mbytes) EnableSendfile Off #(minor performance boost) EnableMMAP Off Win32DisableAcceptEx HostnameLookups Off #(default) I also tried to tune the following registry parameters, setting their values to 4194304 in decimal (they are REG_DWORD), and rebooting afterwards: HKLM\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultReceiveWindow HKLM\SYSTEM\CurrentControlSet\Services\AFD\Parameters\DefaultSendWindow Additionally, I tried to install mod_bw, which sets the event timer precision to 1ms, and allows for bandwidth throttling. According to some people it boosts static file serving performance when set to unlimited bandwidth for everybody. Unfortunately, it did nothing for me. So: AnalogX HTTP: 3300kB/s Gene6 FTPD, plain: 3500kB/s Gene6 FTPD, Implicit and Explicit SSL, AES256 Cipher: 1800-2000kB/s freeSSHD: 1100kB/s SMB shared folder: about 3000kB/s Apache HTTP, plain: 550kB/s Apache HTTPS: 2700kB/s Clients that were used in the bandwidth testing: Internet Explorer 8 (HTTP, HTTPS) Firefox 8 (HTTP, HTTPS) Chrome 13 (HTTP, HTTPS) Opera 11.60 (HTTP, HTTPS) wget under CygWin (HTTP, HTTPS) FileZilla (FTP, FTPS, FTP+ES, SFTP) Windows Explorer (SMB) Generally, transfer speeds are not too high, but that's because the server machine is an old quad Pentium Pro 200MHz machine with 2GB RAM. However, I would like Apache to serve at at least 2Mbyte/s instead of 550kB/s, and that already works with HTTPS easily, so I fail to see why plain HTTP is so crippled. I am using a Kerio Winroute Firewall, but no Throttling and no special filters peeking into HTTP traffic, just the plain Firewall functionality for blocking/allowing connections. The Apache error.log (Loglevel info) shows no warnings, no errors. Also nothing strange to be seen in access.log. I have already stripped down my httpd.conf to the bare minimum just to make sure nothing is interfering, but that didn't help either. If you have any idea, help would be greatly appreciated, since I am totally out of ideas! Thanks! Edit: I have now tried a newer Apache 2.2.21 to see if it makes any difference. However, the behaviour is exactly the same. Edit 2: KM01 has requested a sniff on the HTTP headers, so here comes the LiveHTTPHeaders output (an extension to Firefox). The Output is generated on downloading a single file called "elephantsdream_source.264", which is an H.264/AVC elementary video stream under an Open Source license. I have taken the freedom to edit the URL, removing folders and changing the actual servers domain name to www.mydomain.com. Here it is: LiveHTTPHeaders, Plain HTTP: http://www.mydomain.com/elephantsdream_source.264 GET /elephantsdream_source.264 HTTP/1.1 Host: www.mydomain.com User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive HTTP/1.1 200 OK Date: Wed, 21 Dec 2011 20:55:16 GMT Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/0.9.8r PHP/5.2.17 Last-Modified: Thu, 28 Oct 2010 20:20:09 GMT Etag: "c000000013fa5-29cf10e9-493b311889d3c" Accept-Ranges: bytes Content-Length: 701436137 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/plain LiveHTTPHeaders, HTTPS: https://www.mydomain.com/elephantsdream_source.264 GET /elephantsdream_source.264 HTTP/1.1 Host: www.mydomain.com User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Connection: keep-alive HTTP/1.1 200 OK Date: Wed, 21 Dec 2011 20:56:57 GMT Server: Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/0.9.8r PHP/5.2.17 Last-Modified: Thu, 28 Oct 2010 20:20:09 GMT Etag: "c000000013fa5-29cf10e9-493b311889d3c" Accept-Ranges: bytes Content-Length: 701436137 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/plain

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• load average in top and procs in vmstat

  - by Mingfei.hua

  As far as I know, the load average in top is the numbers of precess(threads) in running or uninterrupted sleep status, So it should be equal to (procs-r +1 )+ procs-b in vmstat, but in practice, this two number always have big gap. Any wrongs in my understanding, appreciate so much if some guys give me some guide. top - 05:34:50 up 1 day, 20:56, 5 users, load average: 2.83, 2.67, 1.62 Tasks: 79 total, 1 running, 78 sleeping, 0 stopped, 0 zombie Cpu(s): 6.8%us, 1.8%sy, 0.0%ni, 91.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.4%st Mem: 1758000k total, 582636k used, 1175364k free, 103932k buffers Swap: 917500k total, 0k used, 917500k free, 180868k cached procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 1182524 103784 180860 0 0 1 9 6 53 7 2 91 0 0 0 0 0 1182524 103784 180860 0 0 0 36 70 117 0 0 100 0 0 0 0 0 1182516 103784 180860 0 0 0 0 73 132 0 1 100 0 0 0 0 0 1182516 103784 180860 0 0 0 0 60 127 0 0 100 0 0 1 0 0 1182516 103784 180860 0 0 0 0 62 102 0 0 100 0 0 0 0 0 1182628 103784 180860 0 0 0 0 289 238 1 2 97 0 0 2 0 0 1152160 103784 180892 0 0 0 8 1481 2371 54 12 34 0 0 1 0 0 1182192 103784 180860 0 0 0 0 681 834 19 4 78 0 0 0 0 0 1182200 103784 180860 0 0 0 0 80 147 0 1 100 0 0 0 0 0 1182200 103784 180860 0 0 0 0 53 107 0 0 100 0 0 0 0 0 1182208 103788 180856 0 0 0 72 64 123 0 0 100 1 0

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• Always use one slow connection in preference of a "faster" one

  - by billc.cn

  In Windows, there's this automatic metric thing where the metric is selected according to the declared speed of the link. I now have a gigabit LAN routed to a 2MB DSL service and a HSDPA mobile broadband connection. The former is always chosen for Internet packets even though the latter is actually faster. I tried setting the mobile broadband's interface metric to 1 and raising its priority in the advanced settings of the adapter settings, but this does not seem to affect the metric of the default route. The default route to the Ethernet interface always have a lower metric than the mobile broadband interface. Am I missing something here?

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• Extremely slow network directory subfolder listing from QNAP NAS in OS X

  - by Josh Newman

  Having an issue where I have a folder on a QNAP NAS (TS-439P II+) with over 68,000 subfolders within it. I can browse it quickly and almost instantaneously within Windows 7 via samba, however in OSX 10.6.8, it takes nearly 10+ minutes to display the subfolders, using both samba and AFP. Hoping there is an easy solution - we can't break the folders into smaller subfolders due to a requirement of proprietary software that accesses the sub folders. I've tried the fixes suggested here, which don't seem to help: http://www.macwindows.com/snowleopard-filesharing.html#030311b

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• pfSense Load Balancer and Virtual IP

  - by jshin47

  I have two identical web servers on 10.2.1.13 and 10.2.1.113. I would like to set up pfSense load balancer to balance requests to both of these. I set up pools that included HTTP and HTTPS for both of these hosts, then set up virtual servers that responded on HTTP and HTTPS and referred traffic to its respective pool. However, I set up the virtual server to listen on 10.2.1.213, a LAN IP rather than a WAN IP, because I want LAN traffic to be able use the load balancer virtual server as well. So, I set up a Virtual IP for 10.2.1.213 on LAN IP, and a NAT port forwarding rule for HTTP and HTTPS traffic on a WAN IP to forward to 10.2.1.213. It seems like this should work, but it fails. What eventually happens is that when I try to access the page from WAN, I am directed to the login page for my pfSense device rather than the page I am expecting. When I try to access 10.2.1.213 from LAN, the request times out. What is going wrong here? I have tried it with and without NAT reflection to no avail. Please advise

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• What's the best way to run Drupal and Django sites behind the same Varnish server?

  - by Alexis Bellido

  I have a high traffic website running with Drupal and Apache, five web servers behind a Varnish server load balancing. Let's say this site is example.com. I'm using five backends and a director like this in my default.vcl: director balancer round-robin { { .backend = web1; } { .backend = web2; } { .backend = web3; } { .backend = web4; } { .backend = web5; } } Now I'm working on a new Django project that will be a new section of this site running on example.com/new-section. After checking the documentation I found I can do something like this: sub vcl_recv { if (req.url ~ "^/new-section/") { set req.backend = newbackend; } else { set req.backend = default; } } That is, using a different backend for a subdirectory /new-section under the same domain. My question is, how do I make something like this work with my director and load balancing setup? I'm probably going to run two or more web servers (backends) with my new Django project, each one with a mix of Gunicorn, Nginx, and a few Python packages, and would like to put all of those in their own Varnish director to load balance. Is it possible to do use the above approach to decide which director to use?, like this: sub vcl_recv { if (req.url ~ "^/new-section/") { set req.director = newdirector; } else { set req.director = balancer; } } All suggestions welcome. Thanks!

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• Slow SSD Read on Server 2008 SP2

  - by Ruben L.

  Im using a Intel X25-M 80G with the latest firmware. on XP /w using IDE and WIN7 using AHCI I get read speeds up to 250MB/S. But when running it with Server 2008 SP1 or SP2 on AHCI, I get read speeds around 180MB/S. Ive updated drivers for 2008, tested with writecache on/off. Any input would be appreciated. thanks!

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• Slow file copying/network browsing in Windows 7

  - by tomp

  The file copying on local discs and network shares, and browsing shared folders is much slower on the Windows 7 than it was on Windows XP. I'm sure everyone encountered this problem, I personally have seen it on many different computers. What would you recommend to speed up these operations?

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• wireless problem: Internet slow connection or limited connectivity

  - by jack

  Hi I have no idea on this problem. My wireless connection doesn't work sometimes. I find it's due to my XP and I have no problem with my Win 7 machine. The problem is - Internet Connection a bit slower than usual Limit connectivity issue I use netsh reset for resetting network configurations but it helps sometimes or not help at all. Any ideas? Thank you.

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• Google products are excessively slow

  - by Sixfoot Studio

  Hi, We're running Windows 2000 for our office server. For years now we have had the problem where everthing Google takes an excessively long time to do anything. Gmail hangs, Analytics takes forever, Google docs times out. I have been back and forth with our ISP on this matter and they are convinced it has something to do with our server. This does not happen when I am at home so the problem either lays with our server or with the ISP. Here is a screencast to show you what I mean. http://www.screencast.com/users/jamesvanderhoven/folders/Jing/media/f7ffce9a-0250-4112-b79d-7dc58c2c8b0a Has anyone else experienced this kind of problem and is there a way to resolve this please? Many thanks!

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• Mysqld increases the load on the CPU and drops after flush-tables

  - by mirage

  Help please advice on the issue. Normal load on the cpu 20-30% us + sy. After restoring the database files from the slave server (same version) began a periodic problem. mysql starts to load the cpu at 100% (us + sy grows proportionally). The queue is growing, everything slows down. But with mysqladmin flush-tables are normalized for a few hours. Dedicated linux server running mysql 2 x E5506 24Gb RAM, database size 50Gb. [OK] Currently running supported MySQL version 5.0.51a-24 + lenny4-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics --------------------------------------- ---- [-] Status: + Archive-BDB-Federated + InnoDB-ISAM-NDBCluster [-] Data in MyISAM tables: 33G (Tables: 1474) [-] Data in InnoDB tables: 1G (Tables: 4) [-] Data in MEMORY tables: 120K (Tables: 3) [-] Reads / Writes: 91% / 9% [-] Total buffers: 12.8M per thread and 7.1G global [OK] Maximum possible memory usage: 15.8G (66% of installed RAM) 4000 - 5500 rps key_buffer = 1536M max_allowed_packet = 2M table_cache = 4096 sort_buffer_size = 409584 read_buffer_size = 128K read_rnd_buffer_size = 8M myisam_sort_buffer_size = 64M thread_cache_size = 500 query_cache_size = 100M thread_concurrency = 24 max_connections = 700 tmp_table_size = 4096M join_buffer_size = 4M max_heap_table_size = 4096M query_cache_limit = 1M low_priority_updates = 1 concurrent_insert = 2 wait_timeout = 30 server-id = 1 log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M innodb_buffer_pool_size = 1536M innodb_log_buffer_size = 4M innodb_flush_log_at_trx_commit = 2 How to solve the problem?

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• WiFi & GbE Slow while Both Active.

  - by Mark Tomlin

  I'm having a problem with my WiFi network connection when I use my wired GbE connection concurrently on my Laptop. I'm using my WiFi for Internet access, and general web surfing and I'm using my GbE connection to connect to my PlayStation so I can stream media. The WiFi connection is via a Linksys 610N connected to my Cable Modem. Where as the GbE connection is a direct connection from my Ethernet port to the Ethernet port of the PS3 via a Cat-5 cable (no router in between this connection). As soon as I connect the cable from the PS3 to my Ethernet port on my Laptop the WiFi connection slows to a halt, but then allows for a connection to the web as normal but at much slower speeds for the things like BitTorrent that stops completely. It seems to me that Windows can't handle both connections at once. It will have both active but it can only accept and send packets on one device at one time. I can get WiFi connections to work to go to websites and the like, but once I use my GbE connection to share media between my Laptop and my PS3 the Wifi connection dies out and I no longer have access to the internet. I setup my connection on the PS3 and the Laptop following the insturctions posted here: http://forums.finalgear.com/problems/s14e01-ps3-size-problem-40642/#post1188132 And the following is the results of my ipconfig. Windows IP Configuration Host Name . . . . . . . . . . . . : dygear Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter WiFi: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Intel(R) PRO/Wireless 3945ABG Network Connection Physical Address. . . . . . . . . : 00-19-**-**-**-** Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.1.111 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 DHCP Server . . . . . . . . . . . : 192.168.1.1 DNS Servers . . . . . . . . . . . : 192.168.1.1 167.206.254.2 167.206.254.1 Lease Obtained. . . . . . . . . . : Wednesday, May 19, 2010 08:55:30 Lease Expires . . . . . . . . . . : Thursday, May 20, 2010 08:55:30 Ethernet adapter LAN: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet Physical Address. . . . . . . . . : 00-16-**-**-**-** Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 192.168.1.50 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Any ideas?

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• Linux software RAID6: rebuild slow

  - by Ole Tange

  I am trying to find the bottleneck in the rebuilding of a software raid6. ## Pause rebuilding when measuring raw I/O performance # echo 1 > /proc/sys/dev/raid/speed_limit_min # echo 1 > /proc/sys/dev/raid/speed_limit_max ## Drop caches so that does not interfere with measuring # sync ; echo 3 | tee /proc/sys/vm/drop_caches >/dev/null # time parallel -j0 "dd if=/dev/{} bs=256k count=4000 | cat >/dev/null" ::: sdbd sdbc sdbf sdbm sdbl sdbk sdbe sdbj sdbh sdbg 4000+0 records in 4000+0 records out 1048576000 bytes (1.0 GB) copied, 7.30336 s, 144 MB/s [... similar for each disk ...] # time parallel -j0 "dd if=/dev/{} skip=15000000 bs=256k count=4000 | cat >/dev/null" ::: sdbd sdbc sdbf sdbm sdbl sdbk sdbe sdbj sdbh sdbg 4000+0 records in 4000+0 records out 1048576000 bytes (1.0 GB) copied, 12.7991 s, 81.9 MB/s [... similar for each disk ...] So we can read sequentially at 140 MB/s in the outer tracks and 82 MB/s in the inner tracks on all the drives simultaneously. Sequential write performance is similar. This would lead me to expect a rebuild speed of 82 MB/s or more. # echo 800000 > /proc/sys/dev/raid/speed_limit_min # echo 800000 > /proc/sys/dev/raid/speed_limit_max # cat /proc/mdstat md2 : active raid6 sdbd[10](S) sdbc[9] sdbf[0] sdbm[8] sdbl[7] sdbk[6] sdbe[11] sdbj[4] sdbi[3](F) sdbh[2] sdbg[1] 27349121408 blocks super 1.2 level 6, 128k chunk, algorithm 2 [9/8] [UUU_UUUUU] [=========>...........] recovery = 47.3% (1849905884/3907017344) finish=855.9min speed=40054K/sec But we only get 40 MB/s. And often this drops to 30 MB/s. # iostat -dkx 1 sdbc 0.00 8023.00 0.00 329.00 0.00 33408.00 203.09 0.70 2.12 1.06 34.80 sdbd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdbe 13.00 0.00 8334.00 0.00 33388.00 0.00 8.01 0.65 0.08 0.06 47.20 sdbf 0.00 0.00 8348.00 0.00 33388.00 0.00 8.00 0.58 0.07 0.06 48.00 sdbg 16.00 0.00 8331.00 0.00 33388.00 0.00 8.02 0.71 0.09 0.06 48.80 sdbh 961.00 0.00 8314.00 0.00 37100.00 0.00 8.92 0.93 0.11 0.07 54.80 sdbj 70.00 0.00 8276.00 0.00 33384.00 0.00 8.07 0.78 0.10 0.06 48.40 sdbk 124.00 0.00 8221.00 0.00 33380.00 0.00 8.12 0.88 0.11 0.06 47.20 sdbl 83.00 0.00 8262.00 0.00 33380.00 0.00 8.08 0.96 0.12 0.06 47.60 sdbm 0.00 0.00 8344.00 0.00 33376.00 0.00 8.00 0.56 0.07 0.06 47.60 iostat says the disks are not 100% busy (but only 40-50%). This fits with the hypothesis that the max is around 80 MB/s. Since this is software raid the limiting factor could be CPU. top says: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 38520 root 20 0 0 0 0 R 64 0.0 2947:50 md2_raid6 6117 root 20 0 0 0 0 D 53 0.0 473:25.96 md2_resync So md2_raid6 and md2_resync are clearly busy taking up 64% and 53% of a CPU respectively, but not near 100%. The chunk size (128k) of the RAID was chosen after measuring which chunksize gave the least CPU penalty. If this speed is normal: What is the limiting factor? Can I measure that? If this speed is not normal: How can I find the limiting factor? Can I change that?

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• HP DL185 - very slow disk read speed

  - by fistameeny

  Hi, I have a HP DL185 G6 Server (12 disk model) with the following spec: Quad Core Xeon 2.27GHz 6GB RAM HP P212 RAID controller with battery backup 2 x 128GB 15K SAS 3.5" (RAID-1 for the operating system) 4 x 750GB 7.5K SAS 3.5" (RAID-5 for the data, 2TB usable space) The operating system is Ubuntu Server 9.10. Both drives have been formatted as EXT4. We are finding that read speed of the RAID-5 array is poor. Disk test results below: sudo hdparm -tT /dev/cciss/c0d1p1 /dev/cciss/c0d1p1: Timing cached reads: 15284 MB in 2.00 seconds = 7650.18 MB/sec Timing buffered disk reads: 74 MB in 3.02 seconds = 24.53 MB/sec For info, the RAID-1 array performs as follows: sudo hdparm -tT /dev/cciss/c0d0p1 /dev/cciss/c0d0p1: Timing cached reads: 15652 MB in 2.00 seconds = 7834.26 MB/sec Timing buffered disk reads: 492 MB in 3.01 seconds = 163.46 MB/sec We thought this was because with no battery, read/write cache is disabled. We have bought and installed the battery backup and have used the HP bootable CD to change the cache settings to 50% read / 50% write and check cache is enabled on the drives and the controller. Is there something I'm missing?

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• Multimaster Keepalived Configuration (Virtual IP with Load Balancing)

  - by Rad Akefirad

  Here are requirements: 1. High Availability 2. Load Balancing First configuration 1. Two linux servers have been configured with one static IP for each: 10.17.243.11, 10.17.243.12 2. Keepalived has been installed and configured with one VRRP instance to provide one virtual IP (10.17.243.10 as VIP, 10.17.243.11 as master and 10.17.243.12 as backup). 3. Everything works fine. The VIP is assigned to the master server (10.17.243.11) as long as it is up and running. As soon as it goes down, the VIP will be assigned to the backup server (10.17.243.12). 4. The problem here is all communication goes to the master server. Second configuration 1. I found active-active configuration for Keepalived which is possible by defining more than one VRRP instance. So that both server have two IPs (real 10.17.243.11 and virtual 10.17.243.10 for server #1 and real 10.17.243.12 and virtual 10.17.243.20 for server #2. 2. Everything works fine. we have two VIPs which are accessible (HA). But all communication coming to each IP still goes to one single machine (either server #1 or #2 depending on the IP). However I found some tricks on the DNS to overcome this limitation. But it's not acceptable in our case. Question: Is there any way to have one virtual IP which is assigned to both servers? By that I mean both servers are handling some part of workload (like the thing we do in web server load balancing)? By using either keepalived or some other tools? Thanks in advance.

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• Problem with slow hard disk

  - by Makis Arvin

  We bought some new PCs in my company with the new iCore 7 and 8GB memory and the following hard disk: WESTERN DIGITAL WD8000AARS 800GB CAVIAR GREEN SATA2 The problem we have is that after installing windows XP64 SP2 the write speed of the hard disk is extremely low!. The windows system monitor shows that the Average Disk queue length is always at 100% and a winzip extract of 350mb takes about 8min. Is there any idea on where to start looking for the cause of that? Thanks

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• How do I Install Intermediate Certificates (in AWS)?

  - by getmizanur

  I have installed private key (pem encoded) and public key certificate (pem encoded) on Amazon Load Balancer. However, when I check the SSL with site test tool, I get the following error: Error while checking the SSL Certificate!! Unable to get the local issuer of the certificate. The issuer of a locally looked up certificate could not be found. Normally this indicates that not all intermediate certificates are installed on the server. I converted crt file to pem using these commands from this tutorial: openssl x509 -in input.crt -out input.der -outform DER openssl x509 -in input.der -inform DER -out output.pem -outform PEM During setup of Amazon Load Balancer, the only option I left out was certificate chain. (pem encoded) However, this was optional. Could this be cause of my issue? And if so; How do I create certificate chain? UPDATE If you make request to VeriSign they will give you a certificate chain. This chain includes public crt, intermediate crt and root crt. Make sure to remove the public crt from your certificate chain (which is the top most certificate) before adding it to your certification chain box of your Amazon Load Balancer. If you are making HTTPS requests from an Android app, then above instruction may not work for older Android OS such as 2.1 and 2.2. To make it work on older Android OS: go here click on "retail ssl" tab and then click on "secure site" "CA Bundle for Apache Server" copy and past these intermediate certs into certificate chain box. just incase if you have not found it here is the direct link. If you are using geo trust certificates then the solution is much the same for Android devices, however, you need to copy and paste their intermediate certs for Android.

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• Slow LAN transfer from 3rd party computer

  - by Chris

  Hi Everyone, I've got an odd problem that I'm not really sure where to start the troubleshooting process. I have a 'server' with Windows Server 2008R2 (64-bit) installed and it has a couple of hard drives. If I Remote Desktop into the server and transfer files from one HD to the other, all it fine. If however, I use my workstation (Windows 7 64bit) and open up a shared resource on the server and transfer a file from one hard drive on the server to another HD on the server (not using Remote Desktop, just Windows explorer/Network places), the transfer crawls... It takes about 5mins to discover files/calculate the transfer and then starts transferring at speeds like 56KB/s - 200KB/s. Both machines have Marvel GigE network ports with a TrendNet 8-port green GigE switch. I've set Jumbo packets to 9K on both machines...

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• Windows Server 2012 Hyper-V very slow

  - by Matt Taylor

  I have been running several Hyper-V VMs on Windows Server 2008 R2 for the past couple of years and enjoying perfectly adequate performance for my testing/development/r&d environments. I'm a software developer so my hardware knowledge is basic however I built the rig using: •Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Motherboard •Intel Core i7 960 3.20GHz (Bloomfield) (Socket LGA1366) •24GB triple channel RAM The host OS is running on an OCZ SSD and all the VMs are running on a 2TB Marvell SATA3 RAID 0 array consisting of 2 Western Digital Caviar Black 7,200rpm drives. I have tested the speed of the 2TB drive and appear to be getting less than 3Mbs but it can adequately run a 4 VM farm including a DC, (SQL) database and IIS application servers. I recently upgraded the SSD on which the host runs to a 256GB OCZ Vertex 4 and took the opportunity to upgrade to Windows Server 2012 and installed the Hyper-V role. I tried importing one of my existing Windows Server 2008 R2 VMs (and converted it to .vhdx) plus I have tried creating a brand new Windows Server 2008 R2 VM but both are running extremely slowly and I can see nothing obvious using the host and guest Task Manager/Resource Monitor tools. In both cases the VM has 8GB RAM (fixed), 4 CPUs, fixed size HD (not expanding) and is using an external virtual network running on a separate NIC to the host. I have upgraded the BIOS to the latest available version and checked the virtualization settings. I have run out of "obvious" (to a developer) things to check/configure and my next option will be to re-install the host OS but before I do I would very much appreciate any advice from any experts out there. Thanks

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• Mysql replication, Slow resyncing of slave after an error

  - by James Hackett

  I have a slave that got an error about a months or so ago and got way behind the master. I fixed the error and now playing catchup with the master but its going very slowly. Its going at 1.3x real time. I was using less that 10% of the db resources when these writes were first happening so the speed of the server shouldn't be an issue. Is there any settings I can switch to help the slave catch up with the master?

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• new xp install, but it moves slow

  - by doug

  hi there I just installed new XP windows OS on a old laptop. I did also all the updates I was asked for. I installed also, the latest driver updates from the official laptop producer site. Now, when I try to use that laptop to talk on Yahoo! Messenger, the sound quality is very bad, and I barely hear what the other person is saying. Before I was reinstalling the XP the laptop were working fine. do you have any tips for me? What software utilities to try in order to improve it's performance? what software utilities to install in order to test it's performances?

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• slow DNS resolution

  - by Ehsan

  I have a DNS server that resolves all queries for an internal group of servers. It is a bind on CentOS 5.5 (same as RHEL5) and I have set it up to allow recursion and resolve direction without any forwarders. The problem I am facing is that it takes a freakishly long amount of time to resolve a name for the first time. (in the magnitudes of 20 sec) This causes clients to give timeout. When I set it to forward all to Google's public DNS, i.e. 8.8.8.8+8.8.4.4, it works very nicely (within a second). I tried monitoring the traffic on the net to see why it is doing this: [root@ns1 ~]# tcpdump -nnvvvA -s0 udp tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 23:06:36.137797 IP (tos 0x0, ttl 64, id 35903, offset 0, flags [none], proto: UDP (17), length: 60) 172.17.1.10.36942 > 172.17.1.4.53: [udp sum ok] 19773+ A? www.paypal.com. (32) E..<[email protected]... .....N.5.(6.M=...........www.paypal.com..... 23:06:36.140594 IP (tos 0x0, ttl 64, id 56477, offset 0, flags [none], proto: UDP (17), length: 71) 172.17.1.4.6128 > 192.35.51.30.53: [udp sum ok] 10105 [1au] A? www.paypal.com. ar: . OPT UDPsize=4096 (43) E..G....@........#3....5.3fR'y...........www.paypal.com.......)........ 23:06:38.149756 IP (tos 0x0, ttl 64, id 13078, offset 0, flags [none], proto: UDP (17), length: 71) 172.17.1.4.52425 > 192.54.112.30.53: [udp sum ok] 54892 [1au] A? www.paypal.com. ar: . OPT UDPsize=4096 (43) [email protected]&.....6p....5.3.q.l...........www.paypal.com.......)........ 23:06:40.159725 IP (tos 0x0, ttl 64, id 43016, offset 0, flags [none], proto: UDP (17), length: 71) 172.17.1.4.24059 > 192.42.93.30.53: [udp sum ok] 11205 [1au] A? www.paypal.com. ar: . OPT UDPsize=4096 (43) E..G....@..@.....*].]..5.3..+............www.paypal.com.......)........ 23:06:41.141403 IP (tos 0x0, ttl 64, id 35904, offset 0, flags [none], proto: UDP (17), length: 60) 172.17.1.10.36942 > 172.17.1.4.53: [udp sum ok] 19773+ A? www.paypal.com. (32) E..<.@..@..@... .....N.5.(6.M=...........www.paypal.com..... 23:06:42.169652 IP (tos 0x0, ttl 64, id 44001, offset 0, flags [none], proto: UDP (17), length: 60) 172.17.1.4.9141 > 192.55.83.30.53: [udp sum ok] 1184 A? www.paypal.com. (32) E..<[email protected].#..5.(...............www.paypal.com..... 23:06:42.207295 IP (tos 0x0, ttl 54, id 38004, offset 0, flags [none], proto: UDP (17), length: 205) 192.55.83.30.53 > 172.17.1.4.9141: [udp sum ok] 1184- q: A? www.paypal.com. 0/3/3 ns: paypal.com. NS ns1.isc-sns.net., paypal.com. NS ns2.isc-sns.com., paypal.com. NS ns3.isc-sns.info. ar: ns1.isc-sns.net. AAAA 2001:470:1a::1, ns1.isc-sns.net. A 72.52.71.1, ns2.isc-sns.com. A 38.103.2.1 (177) E....t..6./A.7S......5#..................www.paypal.com..................ns1.isc-sns.net..............ns2.isc-sns...............ns3.isc-sns.info..,.......... ..p.............,..........H4G..I..........&g.. (this goes on for a few more seconds) If you look carefully, you will see that the first 3-4 root servers did not respond at all. This wastes 7-8 seconds, until one of them responded. Do you think I have setup something wrong here? Interestingly, when I dig directly from the root servers that did not respond, the always respond very fast (showing the firewall/nat is not the issue here). E.g. dig www.paypal.com @192.35.51.30 works perfectly, consistently, and very fast. What do you think about this mystery?

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• SQL Management Studio is painfully slow on 32-bit Windows 7

  - by Sergei

  I've been having issues running anything in SQL Management Studio on Win 7. Basically, doing anything through the Management Studio interfaces completely freezes it up for a few minutes. Running a query is nearly impossible because it takes nearly 2 minutes just for the IDE to parse it and another minute to run it when the query itself completes instantaneously outside of the IDE. I'm not even going to go into the query designer. Anything with heavy user interaction such as editing a row in the result set where i have to click a cell freezes up the front-end. I tried reinstalling to no avail. Also tried running in compatibility mode without any difference whatsoever. Anybody had a similar experience? I'm running SQL Management Studio 2008 version 10.0.2531.0 on 32-bit Windows 7. Connecting to a remote SQL Server instance (2008 R2). Thanks.

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