Server :: Make Two Storage Server Mirror Data In Real Time?

Jan 15, 2011

I have 2 servers each one with a RAID and I want them mirror they data so if one of them goes down the other one take the job with out disruption. I've heard of multipath by I want to know it in detail or learn of more options.

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Server :: Connect To Server In Graphical Env (real Time)?

Aug 18, 2011

I would like to connect to Linux Server remotely over LAN in graphical modeBut I need access for several users in real time. Everyone must have its own desktop.

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CentOS 5 Server :: Time On Xen VM's Drifting Ahead Of Real Time?

Aug 4, 2009

I am hosting two Virtual Servers both running Centos 5.3 on a host machine also running the same OS. The VM software in use is Xen, as supplied with the OS.The host machine's time and date is fine, however both Virtual Servers are running ahead of real time consitantly.Running /etc/init.d/ntpd restart will resolve the issue however one of these is running MailScanner and when the time suddenly goes backwards, sometimes by as much as an hour, it stops working properly.

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Server :: Is It Possible To Sync In Real Time Over Ftp?

Feb 1, 2010

I am currently using curlftps to mount a directory on a ftp server locally as /backup , I then use rsync to do an incremental backup to this directory every night and a full backup at the weekend.A requirement has arose for a similar set up but one that syncs in real time, so if a user puts a file in a directory it immediately copies that file to my ftp server, in this case it immediately copies it to /backup

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Server :: Real Time Postfix & Dovecot Monitor

Jun 5, 2009

Is there any application (preferrably web) that can monitor in real time what is going on in my mail server?

Who is sending to who
Who is receiving
List of incoming/sent mail
Dovecot mailbox size
Monitor postfix queue
etc.

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Server :: Run A Homeserver Here For Centralized Data Storage?

Oct 8, 2010

i want to run a homeserver here for centralized data storage and more...features required:

client compatibility with most Linux distributions, MS Windows 2000, XP, Vista, 7, XBOX!
harddisk shutdown if not in use (got some real noisy ones)
easy administration?! (maybe web-based?)
security! no files or folders over the internet (yet)

[code]....

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General :: Check Server Bandwidth Usage In Real Time?

Mar 21, 2010

I'm trying to check my server's bandwidth usage in real time, installed the following programs but none worked so far.

Iptraf - No results even when using iptraf -u
Tcptrack - Error : pcap_loop: cooked-mode frame doesn't have room for sll header
Iftop - No results, everything 0b

Are there any programs that displays bandwidth usage in real time and actually works on VPSes? Or getting real time bandwidth usage on a VPS is simply impossible?

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CentOS 5 Server :: Method Of Seeing Real-Time Traffic / IP To Apache

Sep 16, 2010

We have a production web site running apache 2.2.3 across several web servers. we also have a major problem with SPAM comments right now. our method of identifying valid IPs (whether by external clients/customers, or internal personnel) vs SPAM'ers is not ideal - its prone to erroneously labeling legit IP's as targets to be blacklisted.

What we need is.. a way to see how much distinct request traffic is coming from any given IP address to the site in real time (or very near realtime). Essentially we want to see in some graphic/chart way requests per sec to apache / per ip sorted by requests per sec.Would nTop do this? I've only used this in a limited form at a branch office, not on a production web server.

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Ubuntu Servers :: On Building Home Data Storage Server?

Jan 18, 2010

I need some advice or tips or maybe your own experiences about building a home data storage or NAS.Here's some thoughts / requirements I think it should have:It should expandable. I'll stick a couple of 1TB HDDs and a little later I'll stick some moreIt should easily integrated to both Ubuntu and Windows 7. Ideally it'll be an integrated part of the filesystem.I'm thinking some sort of RAID as a backing up my data. RAID 1 seems like a such a waste but then again, these days, HDDs are cheap.And when I do add more HDDs, I'd like them to appear as one big storage unit instead of separate drives.Any suggestions and tips on how to go about this is welcome. Questions are plenty: should I go with server hardware or is bigger ATX case and standard hardware enough? I'll need some pointers so keep 'em coming

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Server :: Recover RAID5 Storage Array DATA Using Xfs_repair?

Jul 5, 2011

I have an Acer Altos EasyStore SATA NAS box that hung, the only way to reboot was to crash the system (unplug it). Upon reboot it was not recognising the hard drives (it wanted to do a destructive reinitialize). Most of the importent data was backed up, however some was overlooked and we'd quite like to get it back. Removing the disks and placing them in a PC with enough SATA bays to cope, and booting with a live linux distribution (System Rescue CD) I can see the 4 drives are not suffering hardware error and that the original partions exist. Using mdadm I can assemble the Arrays without error (seems to be three but the only one I am concerned with is the RAID5 array of about 3TB). /dev/m1p2 mounts as a loopdevice once an offset is entered. In turn this mounts as an XFS parition. However despite df showing the partition almost to be full. ls -l or ls -a on the mount point shows it to be empty!

I got thusfar using a translation from a German language forum, unfortunately I only speak a little German, and the only other English language post on a simlilar matter I found within that site had no replies. The next step was to unmount loop, then run xfs_chack and xfs_repair on the file system. xfs_check returns that there is are a few dir size and offset errors along with link count mismatches. This I would presume normal for a file system that has become slightly corrupted. xfs_repair (version 3.0.3) gets as far as Phase 3 it finds and corrects zerolength entries, offsets on directories and bogus inode numbers. However the final two lines are:

Code:

realloc failed in blkent_append (2671166480 bytes)
zsh: segmentation fault xfs_repair /dev/loop1

A search on the error missing out data size just returns code to generate it, is anybody able to explain what it means? Also remounting hard drive, ls and varients of still do not return anything. Am I missing some thing (root I am logged in with now would have different credentials presumably to root on the NAS box, so how do I get around this)?

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Server :: MySQL Error 134 From Storage Engine Query: Select Data, Created, Headers?

Mar 1, 2011

I need help about the error in my website. I have the following error....

Code:
user warning: Got error 134 from storage engine query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'theme_registry:database1' in /var/www/html/web/includes/cache.inc on line 26.

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Programming :: Real Time Application - Make Sound Equalization

Nov 28, 2009

An application that can make sound equalization but I couldn't find any powerful tool so I decided to do one my self I know it will be very hard task but their is no other solution my program will do some audio effects like (echo, repeat, trible, bass, filtering, fading,...)and (fft,addition,....), I will take the signal from the mic and put it on the speaker after my operation is done I think I must take into consideration that application is a real time but i don't know what to do! i don't know should I use java or C/C++! I don't know how to deal with the audio driver (take signal from mic and put it on the speaker)

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General :: Make Dmesg Post Output To Tty12 In Real Time

Apr 3, 2011

Terminal with real time dmesg output I want to use tty12 for system messages. Is there a way to mirror all kernel messages to there?

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Ubuntu Servers :: Setup Real-time (or Near Real-time) Folder Synchronization Among 2+ Servers

Mar 23, 2010

what the recommended way to set up real-time (or near real-time) folder synchronization among 2+ servers. I looked a rsync but that doesn't sound real-time and it looks like its something that you might put in a cron once an hour.

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CentOS 5 :: Easiest Way To Mirror Existing Server Setup On A New Server?

Jan 13, 2011

We have two CentOS 5 servers in production (web and database). We are setting up a single staging server that will mirror the configurations of these servers as closely as possible. What is the easiest way to ensure the exact same software and configs as the production servers are setup on the new staging server. Our contracted data center provider has already informed us that they do not perform images and NO we do not have physical access to the machines. It is undetermined whether we will be virtualizing the staging server into two virtual servers yet, so for the purposes of this post lets assume we are not. I'm seeking a faster/more precise method than doing this by eye and hand.

Some information on our web server code...

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Ubuntu Servers :: Web Server Time Freeze And Weird Load Avg Data?

Aug 23, 2010

I am completely stumped. Found my web server (lighttpd) unresponsive this morning and had to hard cycle it. After some cleaning up, all was happy. However, after about an hour of handling a decent amount of web traffic, time freezes as far as the web server is concerned. I've got an hour of access.log data with the following date: [23/Aug/2010:20:42:58 -0500]

It never changes. The load average now reads 0.00 0.00 0.00 (which is totally inaccurate). And I am not able to successfully log in remotely. I have taken the server down 3 or 4 times today and after an hour or so of functioning normally, this is what happens. Additionally, the local time is now off by 30 minutes.Trying to force with ntpdate does nothing (or, at the very least, sets it to the same incorrect time)

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General :: Mirror Microsoft Server 2008 To A Server?

May 17, 2011

We are using Linux as our database server and Microsoft Sever 2008 as our file server. Both are on independent servers. We would like to be able to mirror each server on the other for disaster recovery purposes. I am completely new to Linux.

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Fedora :: Make One 14 As Server That Have Date And Time As Normal?

Mar 2, 2011

I want to make one Fedora 14 as server that have Date and Time as normal. Is there any to make other fedora 14 get Date and time from that Fedora 14 server

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Server :: Mounting A Storage Device Of Other Servers Using NFS On Another Server

Aug 2, 2011

Setup1: Two rack mounted servers with a common storage device serving as the home directories for users on the servers. The storage device is a gfs partition mounted on the servers as the home directory using SAS cables. These servers have RHEL 5.4 as the installed operating system.

Setup2: A standard tower server with Debian 6 as the operating system used for tape backups. This has a tape drive connected to it.

Question: How to mount the storage device of setup1 using NFS on the server in setup2.

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Server :: Sync File Server Data Into Backup Server Machine By Command- Rsync -avu?

Jun 21, 2011

iam trying to sync file server data into backup server machine by command- rsync -avu path/of/data ipaddress-of-backup-server:/path/where/to/save after running it ask for root password and manually it is successful.but i want to make it automatic.for that i also tried cronjob and also generated authentication key but iam not successful in login automatically..anybody know how to authenticate root to login for storing data in backup server.

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Server :: Cluster Storage With The Rock Cluster Storage Operating System?

Jun 8, 2010

I am trying to do the cluster storage with the Rock Cluster storage operating system . I have install the rock cluster on the main server . and I want to connect the client with the PXE boot . when I starting the client then it boot from the PXE boot into the mode of compute node. but it ask the where is to be stored the I have give the path..then server says that not able to find the directory path.

Steps:-
1) insert-ethers
2) client is started with the PXE boot.
3) it detects the dhcp .
4) At last it demand where is to be started by cd-rom, harddisk ,nfs etc.

then I started with the nfs and I have given the lanIp of server.and server is detecting the client but client is not finding the filesystem directory. into export partition directory but it is not taking path.

PATH:-
/export/rock/install it is not finding this path then it is not able to start the o/s from PXE boot..Is there any solution and manual of rock or anyother solution then u can reply to me...

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Software :: Convert Unix Time To 'real' Time

Jan 28, 2010

I used the following command to get the unix time of root user creation:

Code:
awk -F":" '$1 == "root" {print $3}' /etc/shadow
How can i convert this into the date/time of creation?

I am writing a shell script, which determines the OS installation date among other stuff, and i am assuming the root user's account creation date should be a pretty accurate pointer. Are there reasons why i should not be assuming so?I would be open to other suggestion for getting this date/time, but it would nevertheless be interesting to convert the unix time to "real" time without doing complex manual(or otherwise) computation..

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Server :: Splitting A Mirror With LVM?

Feb 22, 2010

I'm running Red Hat Enterprise Linux ES release 4 (Nahant Update 6).

I've created a mirror of a Logical Volume with this command:

# lvconvert -m1 --corelog /dev/datavg/data /dev/dm-16

Now I've this:

# lvs -a -o name,copy_percent,devices
LV Copy% Devices
data 100.00 data_mimage_0(0),data_mimage_1(0)
[data_mimage_0] /dev/dm-11(0)

[Code].....

My goal was to remove devices dm-10, dm-11 and dm-14 from my VG, so I decided to extend the VG with dm-16 and mirror my data LV to that device, then split that mirror from the other devices. The FS is mounted and need to stay online...

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Server :: Ntpd - Time Server - Not Time Source ?

Jul 14, 2011

I have a set of machines on a disconnected network. Periodically, one of the machines connects to the internet and synchronizes its time with a time server that is not known until the connection is established. (The machine queries a central command server for the address of the time server it should synchronize to.)

I then use a custom tool to do some calculations to call adjtimex() and adjust the clock so that it runs fairly accurately.

I know ntpd is supposed to be able to handle disconnected networks but I thought you had to preconfigure the servers in the configuration file.

My intent is to run ntpd on this machine (without configured "server"s) so that it can serve time to the internal network. (Periodic synchronization using ntpdate from the internal machine to the bridge machine.)

The problem: ntpd wants to fuss with the values I set using adjtimex(). I want it to quit thinking it needs to adjust the clock and just serve time to the internal network. (Maybe I have a GPS time source hooked directly to the machine!)

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Ubuntu :: CRM Solo Use Without Server BCM Mirror?

Oct 12, 2010

Im using Ubuntu 10.4 LTS. New user. Looking for a CRM that is comparable to ACT, BCM that is in MS Office, or Sugar like that does not require a server. Need something light for stand alone CRM.

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Server :: Mirror Software Packages From One To Another?

Jan 3, 2011

Server A is running Centos 5.5, Server B is running Centos 5.5.What is the simplest way to grab the package list from Server A, and use yum/rpm to make sure that the same packages are installed on server B, and if not -- install them?

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Server :: Mirror A Mac - View The Software In The ISO's

Apr 26, 2011

I am building a new server to replace a MAc server. I want to use CentOS. I don't know how to view the software in the ISO's; I don't know what version I will need to get these versions:

Apache 2.2.8
MySQL 5/0.45
PHP 5.2.5

I have posted this in the CentOS forums. But I need an answer ASAP.

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CentOS 5 :: How To Mirror Current Server

Jun 26, 2009

I have a server, running Centos 5 and it is working fine. Now I want to have another server (server2), mirror of my current server (server 1) if any time my (sever 1) stopped responding, (server 2) should start working until I fix server 1.

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Server :: Memory Peak Caused Server Crash - Data Interpretation?

Dec 16, 2010

Last week my server crashed. I'm trying to diagnose the cause.

This is the relevant error message in /var/log/messages:

Code:

I'm assuming that I can conclude, then, that apache/httpd was the cause of the memory leak?

Next, I've been tracking my memory usage. Using top, this is an average memory load level for my server:

Code:

I'd like to confirm if my understanding of this data is correct, because Plesk indicates that my memory usage is only 50% or less. (Though I have read a number of reports indicating that Plesk's measurements are frequently wrong.)

Top says: Of the 2,073,156K total memory, 1,982,572K (95.63%) is being used, 90,584K (4.37%) is free. Of that sum, 421,948K (20.35%) are being used as buffers. Additionally, of the 2,096,472K of Swap, 60K is used, and 887,700K (42.34%) is cached.

My questions: Is my memory actually being 95% used? Or is the buffered quantity (20.35%) not a use of physical/virtual memory? (i.e. is it disk usage?) Does the amount of cached Swap influence the percentage of physical/virtual memory being used?

In other words, who is correct? Plesk says I'm using 40-50% of my memory, whereas top says 85-95%.

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Server :: Unable To Copy Data To Remote Server Using Ncftp Command

Jul 16, 2011

I am unable to use ncftp command I have defined all variables used. i have to copy the data to another server FTPS. When i am executing this command it is throwing error

ncftp -u : option unknown

I am copying total script what i am executing in my server. Please some one tell me is there any pistake in using the ncftp command , or tell me some other commands to copy data to remote server

BAK="/opt/DBbackups"
NOW=$(date +"%d-%m-%Y")
FTPU="username"
FTPP="password"

[code]....

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