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  • High CPU load for 1:30 minutes when mounting ext4-raid partition

    - by sirion
    I have a raid 5 (software) with 5x2TB drives. I encrypted the raid with cryptsetup and put an ext4-partition on top. In the beginning opening and mounting the raid took less than 10 seconds, now (for a few weeks) mounting alone takes 1:30 minutes and the cpu stays around 93% the whole time: The output of "time sudo mount /dev/mapper/8000 /media/8000" is: real 1m31.952s user 0m0.008s sys 1m25.229s At the same time only one line is added to /var/log/syslog: kernel: [ 2240.921381] EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: (null) My Ubuntu-version is "12.04.1 LTS" and no updates are pending. I checked the partition with fsck, but it says that all is ok. The "cryptsetup luksOpen" command only takes a few seconds. I also tried changing the raid-bitmap (as it was suggested in some forum) but it did not change the behaviour. sudo mdadm --grow /dev/md0 -b internal and sudo mdadm --grow /dev/md0 -b none I had the idea that it might be the hardware being slow, but a read test with "sudo hdparm -t /dev/md0" spit out values between 62 and 159 MB/sec: Timing buffered disk reads: 382 MB in 3.00 seconds = 127.14 MB/sec Timing buffered disk reads: 482 MB in 3.02 seconds = 159.62 MB/sec Timing buffered disk reads: 190 MB in 3.03 seconds = 62.65 MB/sec Timing buffered disk reads: 474 MB in 3.02 seconds = 157.12 MB/sec Although I think it is strange that the read rate jumps by more than 100% - could that mean something? The speed test when reading from the mapped (decrypted) device shows similar behavior, although it is of course much slower. "sudo hdparm -t /dev/mapper/8000": Timing buffered disk reads: 56 MB in 3.02 seconds = 18.54 MB/sec Timing buffered disk reads: 122 MB in 3.09 seconds = 39.43 MB/sec Timing buffered disk reads: 134 MB in 3.02 seconds = 44.35 MB/sec The output of a verbose mount "mount -vvv /dev/mapper/8000 /media/8000" does not help much: mount: fstab path: "/etc/fstab" mount: mtab path: "/etc/mtab" mount: lock path: "/etc/mtab~" mount: temp path: "/etc/mtab.tmp" mount: UID: 0 mount: eUID: 0 mount: spec: "/dev/mapper/8000" mount: node: "/media/8000" mount: types: "(null)" mount: opts: "(null)" mount: you didn't specify a filesystem type for /dev/mapper/8000 I will try type ext4 mount: mount(2) syscall: source: "/dev/mapper/8000", target: "/media/8000", filesystemtype: "ext4", mountflags: -1058209792, data: (null) Any idea where I could find additional information on why mounting takes so long, or what additional tests I could run?

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  • OutOfMemoryException when I read FileStream 500 MB

    - by Alhambra Eidos
    Hi all, I'm using Filestream for read big file ( 500 MB) and I get the OutOfMemoryException. Any solutions about it. My Code is: using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read)) { byte[] b2 = ReadFully(fs3, 1024); } public static byte[] ReadFully(Stream stream, int initialLength) { // If we've been passed an unhelpful initial length, just // use 32K. if (initialLength < 1) { initialLength = 32768; } byte[] buffer = new byte[initialLength]; int read = 0; int chunk; while ((chunk = stream.Read(buffer, read, buffer.Length - read)) > 0) { read += chunk; // If we've reached the end of our buffer, check to see if there's // any more information if (read == buffer.Length) { int nextByte = stream.ReadByte(); // End of stream? If so, we're done if (nextByte == -1) { return buffer; } // Nope. Resize the buffer, put in the byte we've just // read, and continue byte[] newBuffer = new byte[buffer.Length * 2]; Array.Copy(buffer, newBuffer, buffer.Length); newBuffer[read] = (byte)nextByte; buffer = newBuffer; read++; } } // Buffer is now too big. Shrink it. byte[] ret = new byte[read]; Array.Copy(buffer, ret, read); return ret; } thanks in advanced,

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  • SAS disk performance drops a while after reboot.

    - by Flamewires
    So we have some workstations with identical hardware. The Fedora14 box has a couple weeks uptime and still get good performance. hdparm -tT /dev/sda /dev/sda: Timing cached reads: 21766 MB in 2.00 seconds = 10902.12 MB/sec Timing buffered disk reads: 586 MB in 3.00 seconds = 195.20 MB/sec The Cent 5.5 boxes however seem to be okay after a reboot, /dev/sda: Timing cached reads: 34636 MB in 2.00 seconds = 17354.64 MB/sec Timing buffered disk reads: 498 MB in 3.01 seconds = 165.62 MB/sec but some time later( unsure exactly, tested at approx 1 day uptime) /dev/sda: Timing cached reads: 2132 MB in 2.00 seconds = 1064.96 MB/sec Timing buffered disk reads: 160 MB in 3.01 seconds = 53.16 MB/sec drop to this. This is with very low load. I believe they all have the same bios settings. Any ideas what could cause this on Cent? Ask for more info. It might also be worth noting, that passing the --direct flag causes the slow boxes to perform similarly to the non-slow ones for buffered disk reads.

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  • KVM guest io is much slower than host io: is that normal?

    - by Evolver
    I have a Qemu-KVM host system setup on CentOS 6.3. Four 1TB SATA HDDs working in Software RAID10. Guest CentOS 6.3 is installed on separate LVM. People say that they see guest performance almost equal to host performance, but I don't see that. My i/o tests are showing 30-70% slower performance on guest than on host system. I tried to change scheduler (set elevator=deadline on host and elevator=noop on guest), set blkio.weight to 1000 in cgroup, change io to virtio... But none of these changes gave me any significant results. This is a guest .xml config part: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/dev/vgkvmnode/lv2'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> There are my tests: Host system: iozone test # iozone -a -i0 -i1 -i2 -s8G -r64k random random KB reclen write rewrite read reread read write 8388608 64 189930 197436 266786 267254 28644 66642 dd read test: one process and then four simultaneous processes # dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct 1073741824 bytes (1.1 GB) copied, 4.23044 s, 254 MB/s # dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=1024 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=2048 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=3072 & dd if=/dev/vgkvmnode/lv2 of=/dev/null bs=1M count=1024 iflag=direct skip=4096 1073741824 bytes (1.1 GB) copied, 14.4528 s, 74.3 MB/s 1073741824 bytes (1.1 GB) copied, 14.562 s, 73.7 MB/s 1073741824 bytes (1.1 GB) copied, 14.6341 s, 73.4 MB/s 1073741824 bytes (1.1 GB) copied, 14.7006 s, 73.0 MB/s dd write test: one process and then four simultaneous processes # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 6.2039 s, 173 MB/s # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test2 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test3 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test4 bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 32.7173 s, 32.8 MB/s 1073741824 bytes (1.1 GB) copied, 32.8868 s, 32.6 MB/s 1073741824 bytes (1.1 GB) copied, 32.9097 s, 32.6 MB/s 1073741824 bytes (1.1 GB) copied, 32.9688 s, 32.6 MB/s Guest system: iozone test # iozone -a -i0 -i1 -i2 -s512M -r64k random random KB reclen write rewrite read reread read write 524288 64 93374 154596 141193 149865 21394 46264 dd read test: one process and then four simultaneous processes # dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=1024 1073741824 bytes (1.1 GB) copied, 5.04356 s, 213 MB/s # dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=1024 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=2048 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=3072 & dd if=/dev/mapper/VolGroup-lv_home of=/dev/null bs=1M count=1024 iflag=direct skip=4096 1073741824 bytes (1.1 GB) copied, 24.7348 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.7378 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.7408 s, 43.4 MB/s 1073741824 bytes (1.1 GB) copied, 24.744 s, 43.4 MB/s dd write test: one process and then four simultaneous processes # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 10.415 s, 103 MB/s # dd if=/dev/zero of=test bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test2 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test3 bs=1M count=1024 oflag=direct & dd if=/dev/zero of=test4 bs=1M count=1024 oflag=direct 1073741824 bytes (1.1 GB) copied, 49.8874 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.8608 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.8693 s, 21.5 MB/s 1073741824 bytes (1.1 GB) copied, 49.9427 s, 21.5 MB/s I wonder is that normal situation or did I missed something?

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  • What's up with LDoms: Part 9 - Direct IO

    - by Stefan Hinker
    In the last article of this series, we discussed the most general of all physical IO options available for LDoms, root domains.  Now, let's have a short look at the next level of granularity: Virtualizing individual PCIe slots.  In the LDoms terminology, this feature is called "Direct IO" or DIO.  It is very similar to root domains, but instead of reassigning ownership of a complete root complex, it only moves a single PCIe slot or endpoint device to a different domain.  Let's look again at hardware available to mars in the original configuration: root@sun:~# ldm ls-io NAME TYPE BUS DOMAIN STATUS ---- ---- --- ------ ------ pci_0 BUS pci_0 primary pci_1 BUS pci_1 primary pci_2 BUS pci_2 primary pci_3 BUS pci_3 primary /SYS/MB/PCIE1 PCIE pci_0 primary EMP /SYS/MB/SASHBA0 PCIE pci_0 primary OCC /SYS/MB/NET0 PCIE pci_0 primary OCC /SYS/MB/PCIE5 PCIE pci_1 primary EMP /SYS/MB/PCIE6 PCIE pci_1 primary EMP /SYS/MB/PCIE7 PCIE pci_1 primary EMP /SYS/MB/PCIE2 PCIE pci_2 primary EMP /SYS/MB/PCIE3 PCIE pci_2 primary OCC /SYS/MB/PCIE4 PCIE pci_2 primary EMP /SYS/MB/PCIE8 PCIE pci_3 primary EMP /SYS/MB/SASHBA1 PCIE pci_3 primary OCC /SYS/MB/NET2 PCIE pci_3 primary OCC /SYS/MB/NET0/IOVNET.PF0 PF pci_0 primary /SYS/MB/NET0/IOVNET.PF1 PF pci_0 primary /SYS/MB/NET2/IOVNET.PF0 PF pci_3 primary /SYS/MB/NET2/IOVNET.PF1 PF pci_3 primary All of the "PCIE" type devices are available for SDIO, with a few limitations.  If the device is a slot, the card in that slot must support the DIO feature.  The documentation lists all such cards.  Moving a slot to a different domain works just like moving a PCI root complex.  Again, this is not a dynamic process and includes reboots of the affected domains.  The resulting configuration is nicely shown in a diagram in the Admin Guide: There are several important things to note and consider here: The domain receiving the slot/endpoint device turns into an IO domain in LDoms terminology, because it now owns some physical IO hardware. Solaris will create nodes for this hardware under /devices.  This includes entries for the virtual PCI root complex (pci_0 in the diagram) and anything between it and the actual endpoint device.  It is very important to understand that all of this PCIe infrastructure is virtual only!  Only the actual endpoint devices are true physical hardware. There is an implicit dependency between the guest owning the endpoint device and the root domain owning the real PCIe infrastructure: Only if the root domain is up and running, will the guest domain have access to the endpoint device. The root domain is still responsible for resetting and configuring the PCIe infrastructure (root complex, PCIe level configurations, error handling etc.) because it owns this part of the physical infrastructure. This also means that if the root domain needs to reset the PCIe root complex for any reason (typically a reboot of the root domain) it will reset and thus disrupt the operation of the endpoint device owned by the guest domain.  The result in the guest is not predictable.  I recommend to configure the resulting behaviour of the guest using domain dependencies as described in the Admin Guide in Chapter "Configuring Domain Dependencies". Please consult the Admin Guide in Section "Creating an I/O Domain by Assigning PCIe Endpoint Devices" for all the details! As you can see, there are several restrictions for this feature.  It was introduced in LDoms 2.0, mainly to allow the configuration of guest domains that need access to tape devices.  Today, with the higher number of PCIe root complexes and the availability of SR-IOV, the need to use this feature is declining.  I personally do not recommend to use it, mainly because of the drawbacks of the depencies on the root domain and because it can be replaced with SR-IOV (although then with similar limitations). This was a rather short entry, more for completeness.  I believe that DIO can usually be replaced by SR-IOV, which is much more flexible.  I will cover SR-IOV in the next section of this blog series.

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  • Problem with Sphinx resultset larger than 16 MB in MySQL

    - by gmemon
    Hello All, I am accessing a large indexed text dataset using sphinxse via MySQL. The size of resultset is on the order of gigabytes. However, I have noticed that MySQL stops the query with following error whenever the dataset is larger than 16MB: 1430 (HY000): There was a problem processing the query on the foreign data source. Data source error: bad searchd response length (length=16777523) length shows the length of resultset that offended MySQL. I have tried the same query with Sphinx's standalone search program. It works fine. I have tried all possible variables in both MySQL and Sphinx, but nothing is helping. I am using Sphinx 0.9.9 rc-2 and MySQL 5.1.46. Thanks

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  • Create A Java Variable (String) of a specific size (MB's)

    - by Bernie Perez
    I am trying to benchmark some code. I am sending a String msg over sockets. I want to send 100KB, 2MB, and 10MB String variables. Is there an easy way to create a variable of these sizes? Currently I am doing this. private static String createDataSize(int msgSize) { String data = "a"; while(data.length() < (msgSize*1024)-6) { data += "a"; } return data; } But this takes a very long time. Is there a better way?

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  • Why does BitLocker need a minimum volume size of 64 MB?

    - by Iszi
    Since the future of TrueCrypt appears to be still unclear, I figured I'd try to get my stuff migrated into BitLocker at least for the time being. I nearly never have to access my encrypted data from anything that's not BitLocker-capable, so cross-platform compatibility isn't a big deal to me at this time. However, I am having a bit of an issue understanding the minimum requirement of a 64 MB volume. With TrueCrypt, I was able to protect small files (and most of my protected files are fairly small) in containers down to 300 KB or even less. When I finally created a VHD of an appropriate size last night (100 MB), it seemed the file system itself only took up about 3 MB and encrypting it with BitLocker didn't appear to take up any more. While 3 MB is still an order of magnitude larger than the smallest volume I could make with TrueCrypt, it's still relatively reasonable in comparison to 64 MB. This is an especially large amount of overhead (and largely wasted at that, since it's mostly empty space for now) when I consider that some of these volumes will be stored and synced in the cloud. What possible reasons could BitLocker have for needing volumes to be 64 MB large, when it's not even appearing to use that space? BitLocker FAQ on TechNet

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  • rdiff-backup is taking longer and longer every time it runs

    - by Jakobud
    I've been running rdiff-backup for the past week or so, every night at 4am. It started out not taking that long, but its taking longer and longer and longer every time its runs every night. In some cases there are quite a few new and changed files and in other cases, not so much. It started out taking < 10 minutes, and after a week its taking over 4.5 hrs to run. Take a look at my session stats below: StartTime 1268046002.00 (Mon Mar 8 04:00:02 2010) EndTime 1268046373.50 (Mon Mar 8 04:06:13 2010) ElapsedTime 371.50 (6 minutes 11.50 seconds) SourceFiles 213928 SourceFileSize 277271282225 (258 GB) MirrorFiles 213914 MirrorFileSize 276693097638 (258 GB) NewFiles 16 NewFileSize 578209911 (551 MB) DeletedFiles 2 DeletedFileSize 2598 (2.54 KB) ChangedFiles 27 ChangedSourceSize 5195150 (4.95 MB) ChangedMirrorSize 5217876 (4.98 MB) IncrementFiles 0 IncrementFileSize 0 (0 bytes) TotalDestinationSizeChange 578184587 (551 MB) Errors 0 StartTime 1268132402.00 (Tue Mar 9 04:00:02 2010) EndTime 1268134341.29 (Tue Mar 9 04:32:21 2010) ElapsedTime 1939.29 (32 minutes 19.29 seconds) SourceFiles 213963 SourceFileSize 307959842562 (287 GB) MirrorFiles 213928 MirrorFileSize 277271282225 (258 GB) NewFiles 37 NewFileSize 31265005547 (29.1 GB) DeletedFiles 2 DeletedFileSize 576511960 (550 MB) ChangedFiles 25 ChangedSourceSize 5243761 (5.00 MB) ChangedMirrorSize 5177011 (4.94 MB) IncrementFiles 65 IncrementFileSize 577266412 (551 MB) TotalDestinationSizeChange 31265826749 (29.1 GB) Errors 0 StartTime 1268218802.00 (Wed Mar 10 04:00:02 2010) EndTime 1268225230.15 (Wed Mar 10 05:47:10 2010) ElapsedTime 6428.15 (1 hour 47 minutes 8.15 seconds) SourceFiles 213971 SourceFileSize 307960643843 (287 GB) MirrorFiles 213963 MirrorFileSize 307959842562 (287 GB) NewFiles 9 NewFileSize 694087 (678 KB) DeletedFiles 1 DeletedFileSize 894 (894 bytes) ChangedFiles 38 ChangedSourceSize 30656167797 (28.6 GB) ChangedMirrorSize 30656059709 (28.6 GB) IncrementFiles 48 IncrementFileSize 289278151 (276 MB) TotalDestinationSizeChange 290079432 (277 MB) Errors 0 StartTime 1268305202.00 (Thu Mar 11 04:00:02 2010) EndTime 1268312788.15 (Thu Mar 11 06:06:28 2010) ElapsedTime 7586.15 (2 hours 6 minutes 26.15 seconds) SourceFiles 213971 SourceFileSize 307960643779 (287 GB) MirrorFiles 213971 MirrorFileSize 307960643843 (287 GB) NewFiles 0 NewFileSize 0 (0 bytes) DeletedFiles 0 DeletedFileSize 0 (0 bytes) ChangedFiles 15 ChangedSourceSize 30650824127 (28.5 GB) ChangedMirrorSize 30650824191 (28.5 GB) IncrementFiles 16 IncrementFileSize 689437042 (657 MB) TotalDestinationSizeChange 689436978 (657 MB) Errors 0 StartTime 1268391601.00 (Fri Mar 12 04:00:01 2010) EndTime 1268400145.85 (Fri Mar 12 06:22:25 2010) ElapsedTime 8544.85 (2 hours 22 minutes 24.85 seconds) SourceFiles 213974 SourceFileSize 307960784445 (287 GB) MirrorFiles 213971 MirrorFileSize 307960643779 (287 GB) NewFiles 5 NewFileSize 269587 (263 KB) DeletedFiles 2 DeletedFileSize 128921 (126 KB) ChangedFiles 16 ChangedSourceSize 30650815948 (28.5 GB) ChangedMirrorSize 30650815948 (28.5 GB) IncrementFiles 26 IncrementFileSize 818279963 (780 MB) TotalDestinationSizeChange 818420629 (781 MB) Errors 0 StartTime 1268478002.00 (Sat Mar 13 04:00:02 2010) EndTime 1268488740.33 (Sat Mar 13 06:59:00 2010) ElapsedTime 10738.33 (2 hours 58 minutes 58.33 seconds) SourceFiles 213974 SourceFileSize 307960784238 (287 GB) MirrorFiles 213974 MirrorFileSize 307960784445 (287 GB) NewFiles 0 NewFileSize 0 (0 bytes) DeletedFiles 0 DeletedFileSize 0 (0 bytes) ChangedFiles 16 ChangedSourceSize 30650823920 (28.5 GB) ChangedMirrorSize 30650824127 (28.5 GB) IncrementFiles 19 IncrementFileSize 1041846015 (994 MB) TotalDestinationSizeChange 1041845808 (994 MB) Errors 0 StartTime 1268560803.00 (Sun Mar 14 04:00:03 2010) EndTime 1268573194.82 (Sun Mar 14 07:26:34 2010) ElapsedTime 12391.82 (3 hours 26 minutes 31.82 seconds) SourceFiles 213974 SourceFileSize 307960784238 (287 GB) MirrorFiles 213974 MirrorFileSize 307960784238 (287 GB) NewFiles 0 NewFileSize 0 (0 bytes) DeletedFiles 0 DeletedFileSize 0 (0 bytes) ChangedFiles 14 ChangedSourceSize 30650815948 (28.5 GB) ChangedMirrorSize 30650815948 (28.5 GB) IncrementFiles 15 IncrementFileSize 1116911810 (1.04 GB) TotalDestinationSizeChange 1116911810 (1.04 GB) Errors 0 StartTime 1268647203.00 (Mon Mar 15 04:00:03 2010) EndTime 1268662364.88 (Mon Mar 15 08:12:44 2010) ElapsedTime 15161.88 (4 hours 12 minutes 41.88 seconds) SourceFiles 214010 SourceFileSize 307963430178 (287 GB) MirrorFiles 213974 MirrorFileSize 307960784238 (287 GB) NewFiles 37 NewFileSize 2684172 (2.56 MB) DeletedFiles 1 DeletedFileSize 5348 (5.22 KB) ChangedFiles 32 ChangedSourceSize 30656134913 (28.6 GB) ChangedMirrorSize 30656167797 (28.6 GB) IncrementFiles 71 IncrementFileSize 1316460362 (1.23 GB) TotalDestinationSizeChange 1319106302 (1.23 GB) Errors 0 StartTime 1268733603.00 (Tue Mar 16 04:00:03 2010) EndTime 1268750396.76 (Tue Mar 16 08:39:56 2010) ElapsedTime 16793.76 (4 hours 39 minutes 53.76 seconds) SourceFiles 214010 SourceFileSize 307963430156 (287 GB) MirrorFiles 214010 MirrorFileSize 307963430178 (287 GB) NewFiles 0 NewFileSize 0 (0 bytes) DeletedFiles 0 DeletedFileSize 0 (0 bytes) ChangedFiles 15 ChangedSourceSize 30650823898 (28.5 GB) ChangedMirrorSize 30650823920 (28.5 GB) IncrementFiles 16 IncrementFileSize 936032413 (893 MB) TotalDestinationSizeChange 936032391 (893 MB) Errors 0 StartTime 1268820002.00 (Wed Mar 17 04:00:02 2010) EndTime 1268834619.90 (Wed Mar 17 08:03:39 2010) ElapsedTime 14617.90 (4 hours 3 minutes 37.90 seconds) SourceFiles 214010 SourceFileSize 307963430156 (287 GB) MirrorFiles 214010 MirrorFileSize 307963430156 (287 GB) NewFiles 0 NewFileSize 0 (0 bytes) DeletedFiles 0 DeletedFileSize 0 (0 bytes) ChangedFiles 14 ChangedSourceSize 30650815948 (28.5 GB) ChangedMirrorSize 30650815948 (28.5 GB) IncrementFiles 15 IncrementFileSize 1289272860 (1.20 GB) TotalDestinationSizeChange 1289272860 (1.20 GB) Errors 0 Is this common behavior? It's only about 300gigs of data total. One important thing to note though, rdiff-backup is backup up stuff over to a USB2 external drive. Maybe thats why its so slow?

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  • Is it a bad practice to store large files (10 MB) in a database?

    - by B Seven
    I am currently creating a web application that allows users to store and share files, 1 MB - 10 MB in size. It seems to me that storing the files in a database will significantly slow down database access. Is this a valid concern? Is it better to store the files in the file system and save the file name and path in the database? Are there any best practices related to storing files when working with a database? I am working in PHP and MySQL for this project, but is the issue the same for most environments (Ruby on Rails, PHP, .NET) and databases (MySQL, PostgreSQL).

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  • HP booste l'accès Wi-Fi en entreprise à 900 Mb/s, avec ses nouvelles offres Mobile Access Solution

    HP booste l'accès Wi-Fi en entreprise à 900 Mb/s, avec ses nouvelles offres Mobile Access Solution Aujourd'hui, de nombreuses entreprises utilisent la technologie Wi-Fi pour offrir des accès Internet à leur personnel. De ce fait, elles sont toujours à la recherche de capacités de plus en plus grandes dans ce domaine. Pour y répondre, HP vient de lancer de nouvelles offres dans sa gamme Mobile Access Solution, qui joue dans la cour des connexion Wi-Fi ultra-rapides. Ces points d'accès permettent en effet de fournir jusqu'à 900 Mb/s aux professionnels, et ils sont trois : MSM460 ; MSM466 et SMSM430. Les deux premiers sont dual-radio et possèdent chacun trois flux spatiaux ainsi qu'une puissance de 450Mb/...

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  • The speed of copying a file from a PC to a USB Flash drive started at 30MB/s and decreased to 5.8 MB

    - by Jian Lin
    If I copy a 8GB file from the PC to a USB Flash Drive, the speed will start at around 30 MB/s... maybe 28 MB/s, and then gradually, after a minute, it will go down to 15 MB/s and finally settle down at 5.8 MB/s. But I thought if it is a hard drive, then probably there is the RAM cache and also the internal hard drive cache, and will make the copying of file from PC to hard drive appear fast at first. But for a USB Flash drive, there should be no internal cache for the USB Flash drive itself. Is there a RAM cache for it, so that's why the initial copying seems so fast?

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  • Files and filegroups sql server 2005

    - by Dhivagar
    Can we move default file to another filegroup. sample code is given below Sample code create database EMPLOYEE ON PRIMARY ( NAME = 'PRIMARY_01', FILENAME = 'C:\METADATA\PRIM01.MDF', SIZE = 5 MB , MAXSIZE =50 MB, FILEGROWTH = 2 MB), ( NAME = 'SECONDARY_02', FILENAME = 'C:\METADATA\SEC02.NDF' ), FILEGROUP EMPLOYEE_dETAILS ( NAME = 'EMPDETILS_01', FILENAME = 'C:\METADATA\EMPDET01.NDF', SIZE = 5 MB , MAXSIZE =50 MB, FILEGROWTH = 2 MB), ( NAME = 'EMPDETILS_02', FILENAME = 'C:\METADATA\EMPDET02.NDF', SIZE = 5 MB , MAXSIZE =50 MB, FILEGROWTH = 2 MB) LOG ON ( NAME = 'TRANSACLOG', FILENAME ='c:\METADATA\TRAS01.LDF', SIZE = 5 MB , MAXSIZE =50 MB, FILEGROWTH = 2 MB ) now i want to move the FILENAME = 'C:\METADATA\SEC02.NDF' from deault primary file to the FILEGROUP EMPLOYEE_dETAILS ? need assist ??

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  • Graphics card ATI Asus 9250 128 MB AGP problem.Monitor switching off.

    - by Dominick1978
    I have an old system with these specs: Motherboard: Via P4x266a (with AGP 4x) CPU: P4 1,7 Ghz Memory: 1152 MB DDR SDRAM Graphics card: Voodoo 3 2000 16 MB PSU: 300 Watt It also has 1 dvd-rom, 1 dvd-rw, 2 hard drives (all 4 connected via molex) , 1 sounblaster sound card and 1 ethernet card (both connected via pci). OS: XP Pro Recently I bought Asus 9250 128 MB AGP to replace voodoo.Wnen I switch on the pc the initial screens (until after the xp logo) sometimes are distorted with blurred colours.When XP are loaded there is some flickering but the rest are ok.XP can't recognize the card seeing it as just a VGA adapter.I have downloaded the latest xp drivers from ATI website and installed them.Then after the restart everything is ok (no distorted image or blurring) until after the xp logo.After this the monitor turns off while the pc is still running.I have tried many drivers but the problem persists (of course I removed the voodoo drivers before from the display adapter properties).Only once I have managed to enter XP (after changing BIOS features for graphics card from 256 MB to 128 MB) but the drivers on the control panel had an exclamation mark (ati 9250!) and below them ati 9250 secondary without ! under the display adapter tab and the ATI catalyst program said that it couldn;t find the card.That was the opnly time I went beyond the xp logo.Now the monitor auto switcheS off. So, what do you think? 1)Is this a broken card? 2)Is it the drivers of the card? 3)Is it PSU fault? 4)Anything else? Thanks for your help and excuse my english!

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  • ntfsresize volume and size information

    - by antonio
    I am going to resize my sda2 NTFS partition. When gathering info with ntfsresize, I get: ntfsresize --info /dev/sda2 ntfsresize v2013.1.13 (libntfs-3g) Device name : /dev/sda2 NTFS volume version: 3.1 Cluster size : 4096 bytes Current volume size: 21999993344 bytes (22000 MB) Current device size: 23622320128 bytes (23623 MB) Checking filesystem consistency ... Accounting clusters ... Space in use : 10673 MB (48.5%) Collecting resizing constraints ... You might resize at 10672590848 bytes or 10673 MB (freeing 11327 MB). Please make a test run using both the -n and -s options before real resizing! Can you tell me what is the difference between volume and device size? As for device size, 23622320128 bytes / 1000^2 = 23622.3 MB. Why is 23623 MB reported instead of 23622? Note that parted confirms this value: parted /dev/sda2 unit MB p Model: Unknown (unknown) Disk /dev/sda2: 23622MB Sector size (logical/physical): 512B/512B Partition Table: loop Disk Flags: Number Start End Size File system Flags 1 0.00MB 23622MB 23622MB ntfs

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  • Need advice to choose correct wi-fi drivers for Dell Vostro 3560

    - by overdriven
    I'm having problems with my Dell notebook's Wi-Fi, it can't see some of the available access points, despite they are close and I used to be connected to them yesterday. Other notebooks and my phone can see them. I believe it's a driver issue, since after installing system I haven't downloaded any network drivers. I went to Dell's website to search for them but I have no idea which should I choose. For my Dell Vostro 3560 and system Windows 8.1 64bit these are available: Intel Smart Connect Technology Application APP_iSCT_W8.1_A00_Setup-TJW84_ZPE.exe (23 MB) Vostro-3560_Network_Application_TJW84_WN_4.2.40.2418_A00.EXE (29 MB) Dell Wireless 1704 WLAN 802.11b/g/n (2.4GHz), Bluetooth v4.0+HS Driver DW1704_W8.1_A00_Setup-K1HGN_ZPE.exe (239 MB) Network_Driver_K1HGN_WN_6.30.223.143_A00.EXE (247 MB) Dell Wireless1703 802.11 b/g/n, BT4.0 + HS Driver Dell Wireless1901 802.11a/b/g/n (2.4GHz and 5GHz), Bluetooth v4.0+HS Driver DW1703_DW1901_Win8.1_A00_Setup-7FPWR_ZPE.exe (265 MB) Network_Driver_7FPWR_WN_10.0.0.263_A00.EXE (272 MB) Realtek RTL8105E/RTL8111E Ethernet Controller Driver LOM_Realtek_W8.1_A00_Setup-0XCVW_ZPE.exe (6 MB) Network_Driver_0XCVW_WN_8.018.0621.2013_A00.EXE (12 MB) Intel® Centrino® Wireless-N 2230 Bluetooth Driver BT_Intel_W8.14_A00_Setup-XR83W_ZPE.exe (31 MB) Network_Application_XR83W_WN_3.1.1307.0362_A00.EXE (37 MB)

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  • Wireless connection by using command screen

    - by Amadeus
    I installed Ubuntu 12.04 armhf to my beagleboard-xm and now trying to connect to a wireless network. First, I checked if I can search for available networks: ubuntu@arm:~$ iwlist scan lo Interface doesn't support scanning. usb0 Interface doesn't support scanning. wlan0 Scan completed : Cell 01 - Address: EA:7D:EF:60:C9:0B Channel:1 Frequency:2.412 GHz (Channel 1) Quality=70/70 Signal level=-23 dBm Encryption key:on ESSID:"ghostrider" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=000000005a1ab50e Extra: Last beacon: 6242ms ago IE: Unknown: 000A67686F73747269646572 IE: Unknown: 010882848B962430486C IE: Unknown: 030101 IE: Unknown: 06020000 IE: Unknown: 2A0100 IE: Unknown: 2F0100 IE: Unknown: 32040C121860 IE: Unknown: 2D1A2C181BFF00000000000000000000000000000000000000000000 IE: Unknown: 3D16010800000000FF000000000000000000000000000000 IE: Unknown: DD09001018020000000000 Then I edited /etc/network/interfaces file to the following: root@arm:/etc/wpa_supplicant# cat /etc/network/interfaces auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp # Example to keep MAC address between reboots #hwaddress ether DE:AD:BE:EF:CA:FE # WiFi Example auto wlan0 iface wlan0 inet dhcp wpa-ssid "ghostrider" wpa-psk "b34d373eb2fb836a43b0afffe783c7d0af694724506c9e77b06d1021302905bf" But I cannot still connect to the wireless network: root@arm:/etc/wpa_supplicant# iwconfig lo no wireless extensions. usb0 no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Asociated Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:on eth0 no wireless extensions. root@arm:/etc/network# ifup wlan0 Failed to bring up wlan0. What is wrong? Should I change any other files also? But I think it was enough. By the way if you are curious about where that wpa-psk came from: zero@ghostrider:~$ wpa_passphrase ghostrider 34bddf67c2 network={ ssid="ghostrider" #psk="34bddf67c2" psk=b34d373eb2fb836a43b0afffe783c7d0af694724506c9e77b06d1021302905bf } I will appreciate any effort to help. Regards, Amadeus ps: Also I tried to connect manually: root@arm:/etc/network# iwconfig wlan0 essid ghostrider key s:34bddf67c2 But this did not solve my problem also.

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  • Connecting XRAID to Sunfire via LSI FC card - Drives not showing up

    - by Matthew Watson
    Hi, I've got a Sunfire T1000 machine ( Solaris 10 10/09 s10s_u8wos_08a SPARC ) with a LSI7404EP-LC fibre channel card in it. This is plugged into an XRAID. The system seems to have picked up the card > /usr/platform/`uname -i `/sbin/prtdiag IO Location Type Slot Path Name Model ----------- ----- ---- --------------------------------------------- ------------------------- --------- MB/PCIE0 PCIE 0 /pci@780/fibre-channel fibre-channel MB/PCIE0 PCIE 0 /pci@780/fibre-channel fibre-channel MB/NET0 PCIE MB /pci@7c0/pci@0/network@4 network-pci14e4,1668 MB/NET1 PCIE MB /pci@7c0/pci@0/network@4,1 network-pci14e4,1668 MB/NET2 PCIX MB /pci@7c0/pci@0/pci@8/network@1 network-pci108e,1648 MB/NET3 PCIX MB /pci@7c0/pci@0/pci@8/network@1,1 network-pci108e,1648 MB/PCIX PCIX MB /pci@7c0/pci@0/pci@8/scsi@2 scsi-pci1000,50 LSI,1064 However it doesn't seem to be able to see the xraid attached to it, lsiutil only reports the onboard SAS controller. > /usr/local/bin/lsiutil ~ LSI Logic MPT Configuration Utility, Version 1.62, January 14, 2009 1 MPT Port found Port Name Chip Vendor/Type/Rev MPT Rev Firmware Rev IOC 1. mpt0 LSI Logic SAS1064 A3 105 010a0000 0 Select a device: [1-1 or 0 to quit] I've tried adding the configuration to /kernal/drv/sd.conf and /kernal/drv/ssd.conf as per this thread, however format still cannot see any drives on the xraid. I'm not sure where to go next. Any suggestions? From what I've read..this should pretty much just eb plug it in and they show up in format..

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  • Can ECC registred RAM 512 MB DDR-400 be used on thinclients - specifically Neoware CA10/CA22?

    - by Ramaswami Murugan
    Can ECC registered RAM 512 MB DDR-400 be used on thin clients - specifically Neoware CA10/CA22? Neoware thin clients (now HP Thin clients e100/e140) have 2 slots for a max of 1 Gb of DDR-400 RAM (184 Pin PC3200). I notice that the price of ECC reg RAM is considerably less than that of non-reg RAM ($10 for ECC reg 512 MB vs $24 for non-ECC reg 512 MB) so this approach is worth it for me to upgrade my memory on numerous thin clients (approx 40). The BIOS is Phoenix E686 and the chipset is VIA 800MHz - 1 Ghz.

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  • How can I get Ubuntu 12.04 to boot on a Gigabyte 990Fx MB (efi problem?)

    - by Jeffrey
    I am trying to install Ubuntu 12.04 on a home made system with a gigabyte 990Fxa MB. I can make it through the install process. It does not boot. Windows 7 does boot on the same machine. Suse 11.4 boots on the same machine. Suse 12.4 does not boot. I think there may be an issue with the EFI / GPT system. I know very little about these systems. I really expected the machine to boot. What can I do to get the system to boot? Please direct me to a path to trouble shoot this problem. thanks Jeffrey

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  • How to install Edubuntu on a system with low memory (256 Mb)?

    - by int_ua
    I'm preparing an old system with 256 Mb RAM to send it to some children. It doesn't have Ethernet controller and there are no Internet access at the destination. I've chosen Edubuntu for obvious reasons and modified it with UCK trying to minimize memory usage just to install, let alone using it yet. But Ubiquity won't start even in openbox (edited /etc/lightdm/lightdm.conf) because there are no space left on /cow right after booting. I've already deleted things like ibus, zeitgeist, update-manager (no network access after all), twisted-core, plymouth logos. I'm thinking about creating a swap partition on HDD, can it be later added to expand this /cow ? Is there a package for the text-mode installation which is used on Alternate CDs? I don't want to re-create Edubuntu from an Alternate CD. This behavior is reproducible in VM limited to 256Mb RAM.

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  • How to calculate maximum number of request in 128 MB VPS performance?

    - by ifdion
    I am a newbie here, please let me know if I'm using wrong webmaster terms. I am currently setting up a VPS for a multi site WordPress. The VPS uses Debian 6 LNMP setup and the DNS is being taken care by another service. Currently the VPS is running non multi site WordPress with -+ 83 MB RAM out of 128MB. As far as I know the performance is relative to the number of request, not the number of sites in the multi site setup. The question How do I calculate maximum number of request in with that setup? If the information is not enough, what other factor do I need to know? Thank you in advance.

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