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  • TCP video streaming: TCP throughput(rate) and RTT

    - by misteryes
    we know that a rough estimation of TCP rate is: WINDOW/RTT, where WINDOW is the min(CWIN, RWIN), CWIN is the congestion window size of the sender, while RWIN is the receiving window. nowadays, the encoding rate of videos may be 1000KB/s(8000kbit/s), if RTT is 500ms, it needs the window size to be 2000KB. But we know that usually the receiving window size is below 64KB, there is a big gap. so if RTT is too large, TCP streaming is not possible? Is my understanding right? thanks!

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  • Zenoss need to get freespace threshold and alerts on windows "mount points"

    - by agilenoob
    I have a WMI query that will give me all the data I need to do this but I can't figure out how to get this working in Zenoss. I know I need to set data points and a threshold, and optionaly a graph. The problem is examples of how to do this with WMI are few and very confusing. Could anyone atleast point me to documention on how to do this? WMI Query(WQL): "SELECT Caption, Capacity, Freespace FROM Win32_Volume WHERE DriveLetter IS NULL"

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  • VMWare Pre-Allocated vs. Growable, which is faster?

    - by tekiegreg
    In an effort to increase speed in my Vmware setup, I was thinking about converting a Windows XP Guest 32 bit I have from growable to pre-allocated, I'm currently running VMWare Workstation 7 with Windows 7 64 bit as the host. Specs: Dual Core CPU, one allocated to guest 4GB of RAM, 2GB to guest HD max capacity is 500GB, 150GB allocated to guest (I have 300GB left and don't mind parting with the space, currently HD is 80GB and converting would obviously add another 70GB of space), HD that guest is running on is separate from Host OS Either that or any other suggestions you have might be appreciated, thanks!

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  • R2 live migration between Opteron 8354 and 2435

    - by Safin09
    As per title, will the processor compatibility option allow a live migrate between an AMD Opeteron 2435 (dual proc, hex core) and an AMD Opteron 8354 (quad proc, quad core)? We are out of capacity and wish to use a newer dual socket server rather than an older (yet much more expensive) quad socket server in our cluster.

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  • Get Used rather than Provisioned space in PowerCLI

    - by Matt
    I'm trying to run a capacity report, and when I run the Get-HardDisk cmdlet in PowerCLI, the value it returns for CapacityKB is the Provisioned space. For example, let's say I've thin provisioned a 200GB disk, which is currently using say 30GB, it returns the 200GB value. Is there any way I can get the other value? I need to know how much disk space is actually being used on the LUN by the vmdk file. My PowerCLI version is 5.0.1.

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  • Make logwatch reports more interesting?

    - by Alexander Shcheblikin
    Is it possible to improve the quality of reports from logwatch? Like make it not just report disk usage which doesn't even change much in daily operation, but report significant changes in usage or approaching critical capacity levels? If I cannot do that with logwatch and instead have to write custom scripts to produce such reports, logwatch appears to be pretty useless, or even dangerous, as many users reportedly grow to ignore emails from it knowing they are so boring.

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  • Does SDHC have any write error recovery ?

    - by marc
    What happen if SDHC card get write error (damaged cell / bad sector) ? Whole card is unusable (to trash, all data written to that sector now and in future will be lost) ? or rewrite sector (flash memory get corrupted when writing so maybe have any function to check if sector was written successfully) to another and mark as fault as unusable what will be seen as reduction of capacity but no data lost. I have to do some research about SD card-s on disk less machines. regards

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  • Does SDHC have any write (ECC) error recovery ?

    - by marc
    What happen if SDHC card get write error (damaged cell / bad sector) ? Whole card is unusable (to trash, all data written to that sector now and in future will be lost) ? or rewrite sector (flash memory get corrupted when writing so maybe have any function to check if sector was written successfully) to another and mark as fault as unusable what will be seen as reduction of capacity but no data lost. I have to do some research about SD card-s on disk less machines. regards

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  • Mac OS X missing disk

    - by leo
    In boot camp, it only see partition size to be 149G while disk utility shows only one partition with size 320G. Why diskutil and df gives me different sizes? Also how can i fix it? thanks df -h Filesystem Size Used Avail Capacity Mounted on /dev/disk0s2 **149Gi 20Gi 129Gi 14% /** devfs 110Ki 110Ki 0Bi 100% /dev map -hosts 0Bi 0Bi 0Bi 100% /net map auto_home 0Bi 0Bi 0Bi 100% /home and diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme ***320.1 GB disk0** 1: EFI 209.7 MB disk0s1 2: Apple_HFS Mac HD 319.6 GB disk0s2

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  • How should I interpret the specifications of a SSD?

    - by paulgreg
    When considering to buy a SSD, how should I interpret the different specifications of the SSD? Here are some specific things that need to be deciphered: Controller (this can affect performance and endurance more than all other factors combined) Bus Technology Form Factor (Physical Size) Capacity NAND or NOR technology Power Consumption during Read, during Write, when Idle Read/Write Burst and Sustained Throughput All of these things I would like to be explained in more detail and their actual importance in selecting an SSD.

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  • estimating size of reply HTTP headers

    - by Guanidene
    I am trying to download a file via a basic socket connection, using a HTTP GET request. So, I have to specify how many bytes of data coming in I have to read from the socket. However, I am having trouble deciding the amount of data (say, in bytes) the server would reply back with. I know that there is a "Content-Length" field in the reply sent by server, but that gives me the size of the actual data (without the http headers). Is there a way to get the exact size of HTTP headers sent by the server or an estimation is required? (I am doing this for downloading on a mobile network, where every bit of data matters in terms of time and money, so I don't wish to make an unnecessary larger estimate of the header size.)

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  • Multi device BTRFS filesystem with disk of different size

    - by fokenrute
    I have an existing BTRFS filesystem composed of one 500GB disk and I just bought a 2TB disk to increase the storage capacity of my home server and I want add the new disk to the existing filesystem. From what I read, it seems like no BTRFS setup can handle disk of different sizes without wasting the difference in size between the larger and the smaller disk, but I'm new to BTRFS and I might have missed something, so is there a setup that can allow me to combine two disks in a filesystem without wasting space ?

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  • "No space left on device" with FreeBSD

    - by why
    When I login with root, and run "mkdir .ssh", the system says "No space left on device". But if I login with other user, it goes well. [/root]df -h Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 496M 411M 45M 90% / devfs 1.0K 1.0K 0B 100% /dev /dev/da0s1e 496M 12K 456M 0% /tmp /dev/da0s1f 57G 878M 51G 2% /usr /dev/da0s1d 4.3G 215M 3.8G 5% /var [/root]mkdir .ssh /: create/symlink failed, no inodes free mkdir: .ssh: No space left on device

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  • Are there any well known anti-patterns in the field of system administration?

    - by ojblass
    I know a few common patterns that seem to bedevil nearly every project at some point in its life cycle: Inability to take outages Third party components locking out upgrades Non uniform environments Lack of monitoring and alerting Missing redundancy Lack of Capacity Poor Change Management Too liberal or tight access policies Organizational changes adversely blur infrastructure ownership I was hoping there is some well articulated library of these anti-patterns summarized in a book or web site. I am almost positive that many organizations are learning through trial by fire methods. If not let's start one.

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  • Can only bring up one of two interfaces

    - by mstaessen
    I'm having a bizarre issue with my HP Proliant DL 360 G4p server. It has two gigabit ethernet interfaces but I can bring up only one of them. This is starting to freak me out and that's why I turned here. I'm running the x64 ubuntu 11.10 server edition. lshw -c network shows that the second interface is disabled. I have no idea why ans how to enable it. $ sudo lshw -c network *-network:0 description: Ethernet interface product: NetXtreme BCM5704 Gigabit Ethernet vendor: Broadcom Corporation physical id: 2 bus info: pci@0000:02:02.0 logical name: eth0 version: 10 serial: 00:18:71:e3:6d:26 size: 100Mbit/s capacity: 1Gbit/s width: 64 bits clock: 66MHz capabilities: pcix pm vpd msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.119 duplex=full firmware=5704-v3.27b, ASFIPMIc v2.36 ip=10.48.8.x latency=64 link=yes mingnt=64 multicast=yes port=twisted pair speed=100Mbit/s resources: irq:25 memory:fdf70000-fdf7ffff *-network:1 DISABLED description: Ethernet interface product: NetXtreme BCM5704 Gigabit Ethernet vendor: Broadcom Corporation physical id: 2.1 bus info: pci@0000:02:02.1 logical name: eth1 version: 10 serial: 00:18:71:e3:6d:25 capacity: 1Gbit/s width: 64 bits clock: 66MHz capabilities: pcix pm vpd msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.119 firmware=5704-v3.27b latency=64 link=no mingnt=64 multicast=yes port=twisted pair resources: irq:26 memory:fdf60000-fdf6ffff If I try to ifup eth1, then I get $ sudo ifup eth1 Ignoring unknown interface eth1=eth1. I figured that's what happens when there is no eth1 listed in /etc/network/interfaces. But when I add the configuration for eth1, I still can't ifup. $ sudo ifup eth1 RTNETLINK answers: File exists Failed to bring up eth1. I've also tried ifconfig eth1 up but without any result. For clarity, I have added a masked version of /etc/network/interfaces. I don't think it is the cause of the problem though. $ cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 10.48.8.x netmask 255.255.255.y network 10.48.8.z broadcast 10.48.8.t gateway 10.48.8.u auto eth1 iface eth1 inet static address 193.190.253.x netmask 255.255.255.y network 193.190.253.z broadcast 193.190.253.t gateway 193.190.253.u I really need some help fixing this. It's driving me crazy. Thanks.

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  • Why is Windows "stuck" on the Welcome screen for so long?

    - by Perdana Putra
    I use Windows 7 with a laptop specifications processor core (Core i3), 2 GB DDR3 RAM, the remaining capacity on the system partition (25 GB). I do not know why the "welcome screen" takes a long time (about 40 sec), but yesterday only took about 10 sec., I tried to defragment the disk and do a virus & spyware scan with antivirus, but still the "Welcome screen" comes along. How do I get the welcome screen to pass by faster when Windows boots up?

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  • How to set original error message for apache 2.2

    - by ffffff
    Apache 2.2 default 414 message is Request-URI Too Large The requested URL's length exceeds the capacity limit for this server. I wanna set custom message so I set http.conf ErrorDocument 414 /error/HTTP_REQUEST_URI_TOO_LARGE.html.var But I do not get along well How to set original error message for apache 2.2

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  • How can I recover my Transcend pendrive when both the used space and free space are 0 bytes?

    - by Debabratta
    I have an Transcend pendrive, and when I connect it and double click it to explore, it is showing the error: Please insert a disk into drive Also In the properties field it is showing File system- Unknown Used space- 0 bytes free space- 0 bytes capacity- 0 bytes I tried to format it using using the command prompt but it is not showing in the list disk command. It is also not showing in the Disk Management.

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  • How can I trace NTFS and Share Permissions to see why I can (or can't) write a file

    - by hometoast
    I'm trying to track down WHY I can write in a folder that, by my best estimation, I should not be able to write. The folder is shared with "Everyone" has "Full Control", with the files being more restrictive. My best guess is there's some sort of sub-group membership that's allowing me to write, but the nesting of groups that exists in our Active Directory is pretty extensive. Is there a tool, that will tell me which of the ACL entries allowed or disallowed my writing a file in a folder? The Effective Permissions dialog is marginally helpful, but what I need is something like a "NTFS ACL Trace Tool", if such a thing exists.

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  • How much resources are used during a RDP connection?

    - by KronoS
    Having recently installed a RDP app on my mobile device and got me wondering: this small device which has a limited amount of resources compared to the PC I'm connecting to, is still able to operate my remote machine to almost full capacity. With that, how much of the local machines resources are actually used in the connection to the remote machine? Also how much of the resources are used on the remote machine?

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  • Website Reference about Server Placement

    - by Manuel Faux
    I have to do a student research project about "Server Placement in a Server Room". The paper should contain something like "place the racks about 3 meters away from any wall", "mind the maximum capacity load of the (false) floor" and other placement strategies. I have been searching for a while, but I did not find any reliable reference I can use in my work. Does anyone know some useful websites about server placement?

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  • HP Proliant G7 hardware RAID configuration automation with ribcl

    - by karthik
    I have been trying to automate hardware RAID configuration of HP proliant machines before OS installation (So I can not use hpacucli) ssh into iLO3 doesn't have option for RAID configuration I use ribcl but there is no command for RAID config, however I see this under the command GET_EMBEDDED_HEALTH. <STORAGE> <CONTROLLER> <LABEL VALUE="Controller on System Board"/> <STATUS VALUE="OK"/> <CONTROLLER_STATUS VALUE="OK"/> <SERIAL_NUMBER VALUE="50014380215F0070"/> <MODEL VALUE="HP Smart Array P420i Controller"/> <FW_VERSION VALUE="3.41"/> <DRIVE_ENCLOSURE> <LABEL VALUE="Port 1I Box 1"/> <STATUS VALUE="OK"/> <DRIVE_BAY VALUE="04"/> </DRIVE_ENCLOSURE> <DRIVE_ENCLOSURE> <LABEL VALUE="Port 2I Box 0"/> <STATUS VALUE="OK"/> <DRIVE_BAY VALUE="01"/> </DRIVE_ENCLOSURE> <LOGICAL_DRIVE> <LABEL VALUE="01"/> <STATUS VALUE="OK"/> <CAPACITY VALUE="68 GB"/> <FAULT_TOLERANCE VALUE="RAID 0"/> <PHYSICAL_DRIVE> <LABEL VALUE="Port 1I Box 1 Bay 3"/> <STATUS VALUE="OK"/> <SERIAL_NUMBER VALUE="6TA0N3SZ0000B231CYDT"/> <MODEL VALUE="EH0072FAWJA"/> <CAPACITY VALUE="68 GB"/> <LOCATION VALUE="Port 1I Box 1 Bay 3"/> <FW_VERSION VALUE="HPDH"/> <DRIVE_CONFIGURATION VALUE="Configured"/> </PHYSICAL_DRIVE> </LOGICAL_DRIVE> </CONTROLLER> </STORAGE> My question is, is there a way I modify/create this xml piece (say I have 2 Logical drive with one spare) and reboot the server it takes effect ? If this approach is not correct are there any other ways to automate hardware raid config ?

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