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  • Which is faster, copying everything at once or one thing at a time?

    - by fredley
    I am transferring a bunch (20+) of large (1GB+) files to my external flash drive over USB 2.0. Is it quicker to just sling them all over at once (as in one at a time but not waiting for the previous transfer to finish) so that there are multiple transfers going on, or transfer one, wait for it to finish, transfer the next. The files are coming from a variety of locations so I can't do one single big transfer. Are there any other advantages to one way or the other that are worth considering?

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  • Databases supporting parallel processing across multiple servers

    - by David
    I need a database engine that can utilize multiple servers for processing a single SQL query in parallel. So far I know that this is possible with the some engines, though none of them are feasible for me either because of pricing or missing features. The engines currently known to me are: MS SQL (enterprise) DB2 (enterprise) Oracle (enterprise) GridSQL Greenplum

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  • File association error while trying to browse to a network share in explorer or from run?

    - by ChrisFletcher
    I'm getting the below error message while trying to browse to a local share on a Windows Server 2003 machine: Windows cannot find ### this file does not have a program associated with it for performing this action. Create an Association in the folder options control panel The server is on the network, has an assigned IP address, can access the internet and is otherwise functioning normally. I realise this message can occur when opening a document or file which has no application associated with it, but I'm trying to access a share. What's going on here?

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  • Junk files appeared in my OSX root folder?

    - by user68732
    I see a bunch of junk files in the root folder of my hard drive running Snow Leopard. Here is a screen shot of the files: If I inspect these files, they appear to contain XML with DeviceCertificate, DevicePublicKey, and SystemBUID information, among other XML elements. I do iOS development on this machine. Can anyone explain from where these files came, and if they are an indication of anything serious, such as malware or spyware?

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  • Upgrade Windows 7 to Windows 8 using Technet?

    - by WillyWonka
    I want to go get a TechNet subscription to test some Windows software before I buy it. I want to replicate upgrading Windows 7 to Windows 8 with specific software in a virtual machine then see how stable or if possible to do it at all. I looked at the list of software but they only show Windows 8 Pro or Enterprise. Do you know if there is an Windows 7 to 8 Upgrade ISO available for Technet Standard or Pro?

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  • How to access shared files in two different domains

    - by Sundeep
    There are two internal domains, domainA and domainB at my workplace. I could remote into machines from either domains by using respective credentials. My doubt is if I create a shared folder on domainA with read access to everyone for e.g., \\server1.domainA.net\sharedfolder. Will I be able to access this folder by just entering the path likewise from any machine in domainB without entering credentials.

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  • movie maker problem: re-map paths

    - by Fuxi
    hi, i've upgraded to win7 (on a new machine) and wanted to use my old moviemaker projects again. the problem is that those projects refer to files of a certain path-structure which i can't rebuild under win7 ("documents and settings" is blocked). is there a way to kind of batch-convert those projects? some file specs of the MSWMM file format (for coding a little utility) would be helpful aswell. thx

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  • Apache: Redirect entire virtual host to a URL

    - by DrStalker
    Centos 5.2, Apache 2.2.3 I want to configure Apache to redirect any URL under mail.mydomain.com to the single URL https://mail.google.com/a/mydomain.com How can I set this up with Apache? I have LoadModule rewrite_module modules/mod_rewrite.so but I'm not sure how to actually use this and I can't find a really simple example; I assume I set up a new virtual host with some form of rewrite directive, but how is this done?

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  • Westell router setup page

    - by eych
    I can connect to the internet, ping 192.168.1.1 with no problem, haven't changed any firewall or Anti-virus settings, but bringing up 192.168.1.1 in the browser gives 'Problem loading page'. XP machine...was able to connect to the setup page few weeks ago. Any thoughts?

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  • Number of Splitters on Coaxial Connection and Cable Internet Quality of Service

    - by Matthew Ruston
    Does running multiple coaxial splitters on a single coaxial cable line effect quality of service for cable internet connections? Suppose there are 2-4 splitters between the cable line coming into a building before the connection to a cable modem, does this negatively effect the latency, throughput, etc of a cable internet connection by any measurable amount? Is there a maximum number of times that a coaxial cable can be split into multiple internet and TV connections before QoS suffers?

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  • system error 58 while accessing shares on win 7 from xp

    - by nysingh
    I am getting a weird one. I am getting error following error message while accessing win 7 shares from xp. " system error 58 has occurred. the specified server cannot perform the requested operation." both machines are in same domain. windows xp machine can view and access all other share except windows 7. both machines do not have any firewall.

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  • NFS issue brings down entire vSphere ESX estate

    - by growse
    I experienced an odd issue this morning where an NFS issue appeared to have taken down the majority of my VMs hosted on a small vSphere 5.0 estate. The infrastructure itself is 4x IBM HS21 blades running around 20 VMs. The storage is provided by a single HP X1600 array with attached D2700 chassis running Solaris 11. There's a couple of storage pools on this which are exposed over NFS for the storage of the VM files, and some iSCSI LUNs for things like MSCS shared disks. Normally, this is pretty stable, but I appreciate the lack of resiliancy in having a single X1600 doing all the storage. This morning, in the logs of each ESX host, at around 0521 GMT I saw a lot of entries like this: 2011-11-30T05:21:54.161Z cpu2:2050)NFSLock: 608: Stop accessing fd 0x41000a4cf9a8 3 2011-11-30T05:21:54.161Z cpu2:2050)NFSLock: 608: Stop accessing fd 0x41000a4dc9e8 3 2011-11-30T05:21:54.161Z cpu2:2050)NFSLock: 608: Stop accessing fd 0x41000a4d3fa8 3 2011-11-30T05:21:54.161Z cpu2:2050)NFSLock: 608: Stop accessing fd 0x41000a4de0a8 3 [....] 2011-11-30T06:16:07.042Z cpu0:2058)WARNING: NFS: 283: Lost connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T06:17:01.459Z cpu2:4011)NFS: 292: Restored connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T06:25:17.887Z cpu3:2051)NFSLock: 608: Stop accessing fd 0x41000a4c2b28 3 2011-11-30T06:27:16.063Z cpu3:4011)NFSLock: 568: Start accessing fd 0x41000a4d8928 again 2011-11-30T06:35:30.827Z cpu1:2058)WARNING: NFS: 283: Lost connection to the server 10.13.111.197 mount point /tank/ISO, mounted as 5acdbb3e-410e56e3-0000-000000000000 ("ISO (1)") 2011-11-30T06:36:37.953Z cpu6:2054)NFS: 292: Restored connection to the server 10.13.111.197 mount point /tank/ISO, mounted as 5acdbb3e-410e56e3-0000-000000000000 ("ISO (1)") 2011-11-30T06:40:08.242Z cpu6:2054)NFSLock: 608: Stop accessing fd 0x41000a4c3e68 3 2011-11-30T06:40:34.647Z cpu3:2051)NFSLock: 568: Start accessing fd 0x41000a4d8928 again 2011-11-30T06:44:42.663Z cpu1:2058)WARNING: NFS: 283: Lost connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T06:44:53.973Z cpu0:4011)NFS: 292: Restored connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T06:51:28.296Z cpu5:2058)NFSLock: 608: Stop accessing fd 0x41000ae3c528 3 2011-11-30T06:51:44.024Z cpu4:2052)NFSLock: 568: Start accessing fd 0x41000ae3b8e8 again 2011-11-30T06:56:30.758Z cpu4:2058)WARNING: NFS: 283: Lost connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T06:56:53.389Z cpu7:2055)NFS: 292: Restored connection to the server 10.13.111.197 mount point /sastank/VMStorage, mounted as f0342e1c-19be66b5-0000-000000000000 ("SAStank") 2011-11-30T07:01:50.350Z cpu6:2054)ScsiDeviceIO: 2316: Cmd(0x41240072bc80) 0x12, CmdSN 0x9803 to dev "naa.600508e000000000505c16815a36c50d" failed H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x24 0x0. 2011-11-30T07:03:48.449Z cpu3:2051)NFSLock: 608: Stop accessing fd 0x41000ae46b68 3 2011-11-30T07:03:57.318Z cpu4:4009)NFSLock: 568: Start accessing fd 0x41000ae48228 again (I've put a complete dump from one of the hosts on pastebin: http://pastebin.com/Vn60wgTt) When I got in the office at 9am, I saw various failures and alarms and troubleshooted the issue. It turned out that pretty much all of the VMs were inaccessible, and that the ESX hosts either were describing each VM as 'powered off', 'powered on', or 'unavailable'. The VMs described as 'powered on' where not in any way reachable or responding to pings, so this may be lies. There's absolutely no indication on the X1600 that anything was awry, and nothing on the switches to indicate any loss of connectivity. I only managed to resolve the issue by rebooting the ESX hosts in turn. I have a number of questions: What the hell happened? If this was a temporary NFS failure, why did it put the ESX hosts into a state from which a reboot was the only recovery? In the future, when the NFS server goes a little off-piste, what would be the best approach to add some resilience? I've been looking at budgeting for next year and potentially have budget to purchase another X1600/D2700/disks, would an identical mirrored disk setup help to mitigate these sorts of failures automatically? Edit (Added requested details) To expand with some details as requested: The X1600 has 12x 1TB disks lumped together in mirrored pairs as tank, and the D2700 (connected with a mini SAS cable) has 12x 300GB 10k SAS disks lumped together in mirrored pairs as sastank zpool status pool: rpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 c7t0d0s0 ONLINE 0 0 0 errors: No known data errors pool: sastank state: ONLINE scan: scrub repaired 0 in 74h21m with 0 errors on Wed Nov 30 02:51:58 2011 config: NAME STATE READ WRITE CKSUM sastank ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c7t14d0 ONLINE 0 0 0 c7t15d0 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 c7t16d0 ONLINE 0 0 0 c7t17d0 ONLINE 0 0 0 mirror-2 ONLINE 0 0 0 c7t18d0 ONLINE 0 0 0 c7t19d0 ONLINE 0 0 0 mirror-3 ONLINE 0 0 0 c7t20d0 ONLINE 0 0 0 c7t21d0 ONLINE 0 0 0 mirror-4 ONLINE 0 0 0 c7t22d0 ONLINE 0 0 0 c7t23d0 ONLINE 0 0 0 mirror-5 ONLINE 0 0 0 c7t24d0 ONLINE 0 0 0 c7t25d0 ONLINE 0 0 0 errors: No known data errors pool: tank state: ONLINE scan: scrub repaired 0 in 17h28m with 0 errors on Mon Nov 28 17:58:19 2011 config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c7t1d0 ONLINE 0 0 0 c7t2d0 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 c7t3d0 ONLINE 0 0 0 c7t4d0 ONLINE 0 0 0 mirror-2 ONLINE 0 0 0 c7t5d0 ONLINE 0 0 0 c7t6d0 ONLINE 0 0 0 mirror-3 ONLINE 0 0 0 c7t8d0 ONLINE 0 0 0 c7t9d0 ONLINE 0 0 0 mirror-4 ONLINE 0 0 0 c7t10d0 ONLINE 0 0 0 c7t11d0 ONLINE 0 0 0 mirror-5 ONLINE 0 0 0 c7t12d0 ONLINE 0 0 0 c7t13d0 ONLINE 0 0 0 errors: No known data errors The filesystem exposed over NFS for the primary datastore is sastank/VMStorage zfs list NAME USED AVAIL REFER MOUNTPOINT rpool 45.1G 13.4G 92.5K /rpool rpool/ROOT 2.28G 13.4G 31K legacy rpool/ROOT/solaris 2.28G 13.4G 2.19G / rpool/dump 15.0G 13.4G 15.0G - rpool/export 11.9G 13.4G 32K /export rpool/export/home 11.9G 13.4G 32K /export/home rpool/export/home/andrew 11.9G 13.4G 11.9G /export/home/andrew rpool/swap 15.9G 29.2G 123M - sastank 1.08T 536G 33K /sastank sastank/VMStorage 1.01T 536G 1.01T /sastank/VMStorage sastank/comstar 71.7G 536G 31K /sastank/comstar sastank/comstar/sql_tempdb 6.31G 536G 6.31G - sastank/comstar/sql_tx_data 65.4G 536G 65.4G - tank 4.79T 578G 42K /tank tank/FTP 269G 578G 269G /tank/FTP tank/ISO 28.8G 578G 25.9G /tank/ISO tank/backupstage 2.64T 578G 2.49T /tank/backupstage tank/cifs 301G 578G 297G /tank/cifs tank/comstar 1.54T 578G 31K /tank/comstar tank/comstar/msdtc 1.07G 579G 32.8M - tank/comstar/quorum 577M 578G 47.9M - tank/comstar/sqldata 1.54T 886G 304G - tank/comstar/vsphere_lun 2.09G 580G 22.2M - tank/mcs-asset-repository 7.01M 578G 6.99M /tank/mcs-asset-repository tank/mscs-quorum 55K 578G 36K /tank/mscs-quorum tank/sccm 16.1G 578G 12.8G /tank/sccm As for the networking, all connections between the X1600, the Blades and the switch are either LACP or Etherchannel bonded 2x 1Gbit links. Switch is a single Cisco 3750. Storage traffic sits on its own VLAN segregated from VM machine traffic.

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  • Very poor read performance compared to write performance on md(raid1) / crypt(luks) / lvm

    - by Android5360
    I'm experiencing very poor read performance over raid1/crypt/lvm. In the same time, write speeds are about 2x+ faster on the same setup. On another raid1 setup on the same machine I get normal read speeds (maybe because I'm not using cryptsetup). OS related disks: sda + sdb. I have raid1 configuration with two disks, both are in place. I'm using LVM over the RAID. No encryption. Both disks are WD Green, 5400 rpm. IO test results on this raid1: dd if=/dev/zero of=/tmp/output.img3 bs=8k count=256k conv=fsync - 2147483648 bytes (2.1 GB) copied, 22.3392 s, 96.1 MB/s sync echo 3 > /proc/sys/vm/drop_caches dd if=/tmp/output.img3 of=/dev/null bs=8k - 2147483648 bytes (2.1 GB) copied, 15.9 s, 135 MB/s And here is the problematic setup (on the same machine). Currently I have only one sdc (WD Green, 5400rpm) configured in software raid1 + crypt (luks, serpent-xts-plain) + lvm. Tomorrow I will attach another disk (sdd) to complete this two-disk raid1 setup. IO tests results on this raid1: dd if=/dev/zero of=output.img3 bs=8k count=256k conv=fsync 2147483648 bytes (2.1 GB) copied, 17.7235 s, 121 MB/s sync echo 3 > /proc/sys/vm/drop_caches dd if=output.img3 of=/dev/null bs=8k 2147483648 bytes (2.1 GB) copied, 36.2454 s, 59.2 MB/s We can see that the read performance is very very bad (59MB/s compared to 135MB/s when using no encryption). Nothing is using the disks during benchmark. I can confirm this because I checked with iostat and dstat. Details on the hardware: disks: all are WD green, 5400rpm, 64mb cache. cpu: FX-8350 at stock speed ram: 4x4GB at 1066Mhz. Details on the software: OS: Debian Wheezy 7, amd64 mdadm: v3.2.5 - 18th May 2012 LVM version: 2.02.95(2) (2012-03-06) LVM Library version: 1.02.74 (2012-03-06) LVM Driver version: 4.22.0 cryptsetup: 1.4.3 Here is how I configured the slow raid1+crypt+lvm setup: parted /dev/sdc mklabel gpt type: ext4 start: 2048s end: -1 Now the raid, crypt and the lvm configuration: mdadm --create /dev/md1 --level=1 --raid-disks=2 missing /dev/sdc cryptsetup --cipher serpent-xts-plain luksFormat /dev/md1 cryptsetup luksOpen /dev/md1 md1_crypt vgcreate vg_sql /dev/mapper/md1_crypt lvcreate -l 100%VG vg_sql -n lv_sql mkfs.ext4 /dev/mapper/vg_sql-lv-sql mount /dev/mapper/vg_sql-lv_sql /sql So guys, can you help me identify the reason and fix it? It has to be something with the cryptsetup as there is no such read slowdown on the other setup (sda+sdb) where no encryption is present. But I have no idea what to do. Thanks!

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  • Direct Link to IRC Server with Double ##

    - by bemental
    Trying to create a direct link to an IRC channel with double octothorpes (##). Freenode policy dictates off-topic channels require ## before the channel name. This O'Reilly 'hack' post gives solid instructions for how to link to a channel and open in the default client on a system, but no guidance for channels with doubles. Links to single channels are formatted as "irc://irc-server:port/channel?key"

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  • Amazon EC2 High-Memory Extra Large Instance

    - by Simpanoz
    I am new to Mongodb and EC2. If I use following single MongoDb server : High-Memory Extra Large Instance 17.1 GiB memory, 6.5 ECU (2 virtual cores with 3.25 EC2 Compute Units each), 420 GB of local instance storage, 64-bit platform As a layman, if we quantify I/O, data in MB/sec. How much I/O transactions mongodb server can handle easily, without being burnt out. Consider default settings of EC2 server with Ubuntu and MongoDb version available in AWS marketplace. Thanks in advance

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  • MS Access split database queries

    - by Lance Roberts
    When the frontend of a MS Access db queries a MS Access backend on another machine over the network, does it pull in the whole table/database/file, or does it have some way of extracting just what it needs from the backend, thereby lessening network load.

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  • Can someone explain RAID-0 in plain English?

    - by Edward Tanguay
    I've heard about and read about RAID throughout the years and understand it theoretically as a way to help e.g. server PCs reduce the chance of data loss, but now I am buying a new PC which I want to be as fast as possible and have learned that having two drives can considerably increase the perceived performance of your machine. In the question Recommendations for hard drive performance boost, the author says he is going to RAID-0 two 7200 RPM drives together. What does this mean in practical terms for me with Windows 7 installed, e.g. can I buy two drives, go into the device manager and "raid-0 them together"? I am not a network administrator or a hardware guy, I'm just a developer who is going to have a computer store build me a super fast machine next week. I can read the wikipedia page on RAID but it is just way too many trees and not enough forest to help me build a faster PC: RAID-0: "Striped set without parity" or "Striping". Provides improved performance and additional storage but no redundancy or fault tolerance. Because there is no redundancy, this level is not actually a Redundant Array of Inexpensive Disks, i.e. not true RAID. However, because of the similarities to RAID (especially the need for a controller to distribute data across multiple disks), simple strip sets are normally referred to as RAID 0. Any disk failure destroys the array, which has greater consequences with more disks in the array (at a minimum, catastrophic data loss is twice as severe compared to single drives without RAID). A single disk failure destroys the entire array because when data is written to a RAID 0 drive, the data is broken into fragments. The number of fragments is dictated by the number of disks in the array. The fragments are written to their respective disks simultaneously on the same sector. This allows smaller sections of the entire chunk of data to be read off the drive in parallel, increasing bandwidth. RAID 0 does not implement error checking so any error is unrecoverable. More disks in the array means higher bandwidth, but greater risk of data loss. So in plain English, how can "RAID-0" help me build a faster Windows-7 PC that I am going to order next week?

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  • Adding a Microsoft Exchange 2010 account to my Windows Phone 7.5 mobile (Nokia Lumia 800) without trusted certificate

    - by MAXE
    I have problems in creating an account on my Nokia Lumia 800 (OS version: 7.10.8773.98, of course with Windows Phone 7.1 mounted with all updates) to one of my company's Microsoft Exchange 2010 server, because it cannot provide a trusted certificate...but only when contacting it from outside my network (like https ://mail.(CompanyName).com). Accessing the server from inside my network (pointing directly to the machine name or internal IP address: https ://(MachineName) or https ://10.0.1.200) gives me NO PROBLEM AT ALL! Setting correctly (I guess) all the parameters for the account (accessing from outside my network), the connection (after correctly set my credentials as asked) will not be established. It gives the next error (translated from my language manually): Error of <CompanyName> There is a problem with the certificate of (Server Address). Please contact support or the provider. Last try: X minutes ago Error code: 80072F06 I've tried all possible configurations and parameters (including the check The server requires an encrypted (SSL) connection, of course), but no way. EDITED: As suggested by Oliver Salzburg, I also tried this way without any results. I tried so: I went to my OWA (Outlook Web Access) that gives me the same problem (problems the certificate, it's not trusted) After accepting to continue, I clicked on the Error in Certificate button of the Internet Explorer 9 address bar - Show Certificates - page Details, show: - Copy to file... button - in the exporting wizard: Next - Binary encoding DER X.509 (.cer) (but there was also Base binary 64 X.509 (.cer), no way) - Next - saved to a new file From my Google Mail Account, I sent a mail to myself the certificate as attachment I read the mail from my WP7 phone, saved the attachment and then ran it: answering Yes to Do you wany to install the certificate? of course... Closed any active program and rebooted the phone Re-tried in synchronizing my account....:(...SAME PROBLEM! EDITED 2: Thanks again to Oliver Salzburg, I tried the next solution: I went to the site https://www.testexchangeconnectivity.com/ I selected Exchange ActiveSync option, as suggested I setted all my parameters, as I made for my phone I also setted the option Ignore SSL attendibility (and in another test I didn't) I performed my test This is the complete log (I removed my parameters): Seems the same problem (machine name in the certificate is different from the external Exchange website domain name?)! It is possible to get rid of this annoying (I know by myself who is this server!) problem? Thank you very much.

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  • Dual Use (Mice and Keyboayd) of Windows 7

    - by jmalais
    I saw some answers to this question however they were fairly old (at least 2 years) and primarily for Vista or previous Windows OS versions. My question is this: Is there a program that allows a single Windows 7 computer to have multiple users (2 needed) and allow for two mice and two keyboards on two screens. What I'm trying to achieve: I'd like for the ability to play a game on one monitor while another person surfs the web, uses a program, or possibly play a different game. Any ideas?

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  • How do I install multiple versions of Internet Explorer on Windows 7? [closed]

    - by Guy
    Possible Duplicate: Multiple versions of Internet Explorer on a machine I want to install multiple versions of Internet Explorer on Windows 7. Specifically versions 6, 7, and 8. (Currently I've got 8 installed.) How do I get those 3 versions installed side by side? (I need to do this to test and debug a web application on multiple Internet Explorer versions so other solutions to this end are also appreciated.)

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  • Backing up an online database

    - by Veejay
    I havea 70MB db of my website which is hosted with a provider. I am able to access my db using SSMS 2008 remotely. On a running website, which is the best way I can back up the db locally on machine Thanks

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