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  • How SSD hard drive affected speed of your website (asp.net/linq/ms sql database)

    - by Sergey Osypchuk
    I have a small database (<1G) But we have a lot of complex logi? in website and client complains on render time, which is 3-5 seconds. We are not google, and thousands of users a day is our dream, so size is not a problem, but speed is important. Can anybody share with experience with SSD drives for ASP.NET (MVC)/LINQ/MS SQL based application ? How you performance increased? UPDATE: this whitepaper states that it will be 20 times faster. http://www.texmemsys.com/files/f000174.pdf

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  • Win7 'locking' process/files/folders?

    - by Dynde
    I've had a fair bit problems with sometimes files/folders/processes being 'locked' by Windows. The weird thing is, it's not like the traditional sense, I think, where tools like UnlockIT and wholockme would work. It seems that just giving it a little often helps - making me think it could either be the HDD, the memory, or something in Windows. A scenario: I go into a folder - don't open anything at all, go back up, cut or drag-move the folder to someplace else, it says "Action can't be completed because the folder or a file in it is open in another program". Waiting sometimes 20 seconds sometimes a little longer, and I can move it. Another scenario is deleting a bunch of files in a folder, and it appears that everything is gone, but then suddenly after a few seconds an .exe file pops back up, and I can't delete it. Waiting a few minutes, then pressing refresh and it's gone. I have the strangest feeling that there's a problem with either HDD or memory. I already tried disabling Windows indexing service with no luck. Does anyone have any ideas? EDIT: I should say, that I have a very fast system, 16 GB DDR3 RAM, i7-2600k CPU, SSD main HDD, so I really should not be experiencing any sort of problems, where one might say that it's "reasonable" for the system not to respond right away. Edit2: And I updated SSD firmware a couple months ago, so it shouldn't be bad release FW either

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  • How to maintain a SSD drive on Ubuntu ?

    - by Julien Nicoulaud
    I am running Ubuntu 10.04 on a Intel X25-M PostVille 160 Go SSD drive. How can I tell if there's something wrong ? What should/can I do to maintain its performance/health ? Should I use TRIM and how often ? This may look as a duplicate of this question, but I am more asking in term of good practices and learning how to use this new technology the right way...

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  • Disable RAID Controller

    - by B.Mr.W.
    I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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  • Windows 8.1 - Why are there multiple recovery partitions in the system?

    - by Abhiram
    DISKPART> list partition Partition ### Type Size Offset ------------- ---------------- ------- ------- Partition 1 System 500 MB 1024 KB Partition 2 OEM 40 MB 501 MB Partition 3 Reserved 128 MB 541 MB Partition 4 Recovery 490 MB 669 MB Partition 5 Primary 920 GB 1159 MB Partition 6 Recovery 350 MB 921 GB Partition 7 Recovery 9 GB 921 GB Above is the list of partitions on my system that I recently upgraded to Windows 8.1. Why are there multiple recovery partitions (4,6,7)? Shouldn't there be just one recovery partition? And what is the Reserved partition (#3) for?

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  • How long do uploaded files stay in the tmp folder in Linux Ubuntu?

    - by Jean-Nicolas Boulay Desjardins
    I am building a web application where my users will be able to upload files. After the files are uploaded I need to send the files to two other servers, and after they will be deleted from the server where they were just uploaded to. I am wandering is it a good I idea to keep the uploaded files in the tmp/ folder the time the uploaded files are sent to the other two servers or should I move them to another folder incase they get deleted? I am also wandering because I would like to know if I have to build a cron script to get rid of the files that have been transfered to the other servers so that I get my disk space back.

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  • attach two hdds to a computer having 500W smps

    - by Gaurav Sharma
    I have a desktop system installed with a 250 GB hdd (seagate sata II) this system is having a power supply of 500W (not sure if it is 650W but not more than that) the power supply is a local brand. Will it be safe to attach a second 250 GB sata II hdd on the same system. Safe in the sense that the system may not fall short of power at any time. My system's config is as follows Core2Duo processor Mercury cabinet having an additional fan (small one) sata dvd writer 52X windows xp sp 2 ASUS motherboard (intel G965 express chipset) If the above specified power supply is not sufficient for above configuration of system then please suggest the appropriate power supply (including watts)

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  • can I consolidate a multi-disk zfs zpool to a single (larger) disk?

    - by rmeden
    I have this zpool: bash-3.2# zpool status dpool pool: dpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM dpool ONLINE 0 0 0 c3t600601604F021A009E1F867A3E24E211d0 ONLINE 0 0 0 c3t600601604F021A00141D843A3F24E211d0 ONLINE 0 0 0 I would like to replace both of these disks with a single (larger disk). Can it be done? zpool attach allows me to replace one physical disk, but it won't allow me to replace both at once.

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  • How can I return a 503 status in apache without invoking external scripts

    - by dan mackinlay
    I need to return a 503 status code from one of my sites while it's down for maintenance, in the time-honoured SE_firendly fashion. I can't seem to work out how to do this without invoking external scripts, which I'd rather avoid. Is there an apache directive which will allow me to return an arbitrary HTTP status code without resorting to hacks like invoking a php script which sets the status header?

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  • How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules?

    - by ????
    I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use deadline as the I/O scheduler for USB Flash devices. I can't always change the scheduler manually, right? I think writing udev rules is a good idea. Can someone please write rules for me? I want: When I plug in a USB device, detect the type of the device. If it is a portable USB hard disk, do nothing (I think if a device has more than one partitions, it always a portable hard disk. If it is a USB Flash device, set deadline as it's scheduler.

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  • How can I combine non-identical disks efficiently?

    - by Odys
    There are some not-identical disk of various capacities that I want to combine (somehow). Since there are no duplicate models, I can't use raid between none of them. Is there a way to use them efficiently while being safe? What I have in mind is a software that will use them as if it were Raid-5 or something. I really don't care about max speed. I want in the end to have as less logical drives as possible. Also, I don't mind spending some money on hardware, if needed.

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  • Dell Inspiron 1525 - internal hard drive not detected

    - by GingerT
    Others have asked about this issue but had intermittent access to their HD, therefore their results did not apply to this situation. I have tried reseating the HD to no effect. I also tried booting from the Internal HD to no effect. Next step get a connector cable and move the data to a different HD, or send in for HD recovery? Any suggestions?

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  • Install Windows 8 Apps to custom directory

    - by Timothy Ford
    I'm running Windows 8 Pro on a laptop. I initially installed the OS just to fiddle round with it and get to know something I'd inevitably end up having to fix for someone. The problem being I only gave the partition about 32gb and that ran out pretty quick. I'd like to install office and get used to that as well but unfortunately I'm a few gigabytes short. I'd like to know if I can change the install location of office 2013 and other apps so that I can run them from another partition because there is no space left to the right of this partition I can't extend it.

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  • Setting external IP for Citrix Web Interface

    - by Callum Jones
    I have a Citrix Web Interface (as part of XenApp 6.0 on Windows Server 2008 R2) that is behind a NAT, I can access the web interface fine (via both SSL and standard port 80) but when I go to launch a application that connection is still being made over the server's internal IP address. How do I configure the web interface to default to the external IP address of the box instead of its internal LAN IP?

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  • Would an array of SSD drives be able to succesfully substitute the system memory?

    - by Florin Mircea
    I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the worst DDR3 in this list (memorybenchmark.net/write_ddr3_amd.html) - that shows DDR3 memory performance varying from 2.78 to 6.55 Gb per second, but that video is over 3 years old. This video (youtube.com/watch?v=27GmBzQWwP0) shows a more optimistic situation, but for PCI-E SSD drives: 5 drives peaking at around 4Gb. And this other video shows that stacking up more than 3 SSD's doesn't realistically offer a substantial added performance. This and the fact that in all benchmarks the drives act quite poorly when dealing with small files (5k file read/write averaging from 10MB to around 30-40MBps) as opposed to how native memory handles such files, seems to indicate a definite NO to this question. Also, the write life cycle is indeed limited and the drives might wear out quickly, as kindly pointed out by paddy. However, I wanted to get more opinions on this. Would it be possible to at least obtain current memory performance with SSD's in RAID 0? And if so, in what circumstances? I am assuming using this configuration with a Windows OS that has a memory pagefile resident to that stack of SSD's, thus making it very fast to work with.

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  • DVD drive not recognized

    - by David Oneill
    I'm in the midst of building a computer (first time builder) I got everything plugged in, and hit the power button. After the excitement of the first boot coming up on my screen, I was looking through the BIOS settings. However, joy soon turned sour, as I looked at the list of installed SATA devices. My DVD drive wasn't on the list :( So, what are common things I should check/try?

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  • Is it wise to use SSHDs (Solid state hybrid drives) on a server?

    - by Seb
    I have a bunch of servers with very heavy I/O that currently use SATA3/SAS drives, but do suffer from I/O wait on the SATA drives, and I have just been alerted to the existence of SSHDs which cost the same for 1TB as the 1TB SATA drives that we currently use. However, previously (until Seagate shipped their first 3.5" SSHD in March) they seemed to be exclusively for Netbooks/Notebooks, which leads me to suspect they're not exactly built for the heavy I/O they'd be in for with my servers. So, would an SSHD give me a performance boost over my SATA3 drives in a heavy I/O environment (such as multiple very large high speed file transfers) or is it best to stick with SATA3 with I/O wait??

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  • Recover data from a Windows Dynamic Volume Spanned Disk

    - by iCe
    I have a dynamic volume created with two spanned partitions over two disk. Recently, one disk has started failing, and I want to copy the data inside that disk to another disk, before replacing it. However I don't know how to select only what is inside the failing disk, because the partitions spans across both disks. Maybe imaging the entire disk should do the work? Or I have to copy all the data from both disks? Thanks in advance!

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  • High disk I/O activity in CentOS server

    - by triiim
    I have about 16 websites in a CentOS dedicated, and I am having some problems on high traffic hours, it seems to be a high disk I/O activity causing a general slowdown. I've installed atop and this is what I see on the bottom (the server has been restarted thats why the values are so low): *** system and process activity since boot *** PID RDDSK WRDSK WCANCL DSK CMD 1/18 2176 1.7G 7.3G 854.4M 39 mysqld 671 1248K 3.0G 0K 13 flush-8:0 566 0K 1.1G 0K 5 jbd2/sda2-8 2401 124.2M 529.1M 22408K 3 crond 2032 2.2G 502.0M 0K 12 nginx 2360 425.8M 115.3M 4188K 2 httpd flush-8:0 and jbd2/sda2-8 are the processes I see with iotop using 99% on the IO column, and they are the processes that write the most on the hdd (after mysql). From what I saw in google this could be caused by some ext4 related bug, the current kernel is: Linux srvr.com 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011 x86_64 x86_64 x86_64 GNU/Linux I asked the hosting support to update the kernel and they tried but they now say that the server wont boot with the new installed kernel and they had to go back to the previous, they are not helping very much. Does someone has any idea how could I solve the high disk usage caused by flush-8:0 and jbd2/sda2-8 processes?

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  • one 16K random read I/O issues 2 scsi I/O (16K and 4K) requests in linux

    - by hiroyuki
    I noticed weird issue when benchmarking random read I/O for files in linux (2.6.18). The Benchmarking program is my own program and it simply keeps reading 16KB of a file from a random offset. I traced I/O behavior at system call level and scsi level by systemtap and I noticed that one 16KB sysread issues 2 scsi I/Os as following. SYSPREAD random(8472) 3, 0x16fc5200, 16384, 128137183232 SCSI random(8472) 0 1 0 0 start-sector: 226321183 size: 4096 bufflen 4096 FROM_DEVICE 1354354008068009 SCSI random(8472) 0 1 0 0 start-sector: 226323431 size: 16384 bufflen 16384 FROM_DEVICE 1354354008075927 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 21807710208 SCSI random(8472) 0 1 0 0 start-sector: 1889888935 size: 4096 bufflen 4096 FROM_DEVICE 1354354008085128 SCSI random(8472) 0 1 0 0 start-sector: 1889891823 size: 16384 bufflen 16384 FROM_DEVICE 1354354008097161 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 139365318656 SCSI random(8472) 0 1 0 0 start-sector: 254092663 size: 4096 bufflen 4096 FROM_DEVICE 1354354008100633 SCSI random(8472) 0 1 0 0 start-sector: 254094879 size: 16384 bufflen 16384 FROM_DEVICE 1354354008111723 SYSPREAD random(8472) 3, 0x16fc5200, 16384, 60304424960 SCSI random(8472) 0 1 0 0 start-sector: 58119807 size: 4096 bufflen 4096 FROM_DEVICE 1354354008120469 SCSI random(8472) 0 1 0 0 start-sector: 58125415 size: 16384 bufflen 16384 FROM_DEVICE 1354354008126343 As shown above, one 16KB pread issues 2 scsi I/Os. (I traced scsi io dispatching with probe scsi.iodispatching. Please ignore values except for start-sector and size.) One scsi I/O is 16KB I/O as requested from the application and it's OK. The thing is the other 4KB I/O which I don't know why linux issues that I/O. of course, I/O performance is degraded by the weired 4KB I/O and I am having trouble. I also use fio (famous I/O benchmark tool) and noticed the same issue, so it's not from the application. Does anybody know what is going on ? Any comments or advices are appreciated. Thanks

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  • ASUS P5B Plus motherboard - no any drives found - how to restore RAID array?

    - by Moha
    We have a small server machine with an ASUS P5B Plus motherboard and 4 SATA HDDs. The HDDs were configured in a RAID10 array. Up until now, everything worked fine, but now the system doesn't recognize the drives. BIOS is set to RAID, jMicron controller is set to RAID, yet I can't see any of the drives in the BIOS setup, and jMicron BIOS tells me "no any drives found" The HDDs all spin up, I hear no clicking sounds or anything that would suggest HDD error. I did a search on this problem and replaced the SATA cables as suggested, but nothing's changed. What I have in mind is checking the CMOS battery and resetting the BIOS to use IDE mode, but I don't know if it will ruin the RAID system on the HDDs. It is not a critical server and there's only one database running on it (which I have backup of), but I don't want to setup the server from scratch if not necessary. What should I try to restore the RAID array and put the server back to working order?

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