Software :: - New Storage - Synchronization / Mirroring Tool
Apr 18, 2011
We have a Linux system serving as a storage. As it is running out of free space be bought a new server which should replace the old one. We would like the outage during the migration to be as short as possible. The plan is as follows (actually very similar to XEN live migration):
1. Copy the data to the new storage
2. Stop access to the old storage
3. Synchronization of data
4. Set the new storage as the primary one.
I was thinking of rsync, but the first phase (building file list) takes extremely long, because there are millions of files. Is there any other tool which whould be more suitable for it?
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Oct 25, 2010
I need a good bi-directional sync. tool like unison, that would work properly over ssh and allow manual decisions and merging if both sides (local&remote) contain changes. unison meets most of my needs, the only drawback is the compatibility - it needs to be installed on both sides, and with the same version. Nowadays it's a bit of a problem, if you have say OS11.3 on one node, SL3 on the other and a MacOS on the third. In my view one only needs the ssh connection, all the rest of the file analysis should be done by the local software. Anyone knows such a tool?
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Mar 14, 2011
I work on Linux Regression testing and I am writing a script to automate(shell scripting) the netperf tool when I need to determine the performance(throughput) of agent and client(individually) and I shall be running a shell script on (lets say) client first. But how to obtain the synchronization between them both as I need to execute a command even in board(agent) side to get the script going.
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Mar 11, 2011
I'm interested in buying a new hardware for my company. The old server (now 10 years old) should be replaced with a new one. Till now, I was looking on different hardware suppliers, boards and different other places. I found a Tyan board [URL]. The hardware spec is quite interesting and the board would fullfill our claims.
how both storage devices will be supported by Ubuntu or Debian??
- SATA-Controller: AMD SP5100
- SAS-Controller: LSI 1068E
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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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Jul 9, 2010
I'm looking for a tool for Debian Linux that can measure the synchronisation performance between two desktops.
I'm using RADClock instead of the NTP client to synchronise my desktops.
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Mar 15, 2010
I use Thunderbird in MS Windows and it synchronises with Hotmail.
The standard Ununtu mail programme does not appear to do so.
Have tried without success to download Linux Thunderbird.
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Jun 3, 2010
how to set mirroring (RAID 2) withing centos 5?
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Nov 15, 2009
I 've searched for on a lot of threads and google results, I found no response. Does someone know a solution to synchronize calendar and contacts between a smartphone nokia ( particularly N97 one) and thunderbird with lightning or sunderbird plugins on fedora ( release 11 for me) please?
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Dec 18, 2009
I'm running a Windows 7 guest using Virtual Machine Manager to launch my "console" to the VM. I believe it uses VNC to connect to the console. I'd like to have clipboard synchronization so I can copy from the host and paste to the guest.
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Jan 22, 2010
I have started ntpd service with chkconfig ntpd on .When i execute : ntpdate 0.pool.ntp.org , then i get error :
No suitable server for synchronization .
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Jul 14, 2010
I have two 1TB hard drives, one in my Linux server (running Debian, but I thought I'd ask here anyway) and one in my Windows desktop.
What I would like is a file synchronization program that will automatically (or scheduled via cron) synchronize my hard drive on Linux with my hard drive on Windows via Samba.
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Dec 31, 2010
My phone is dead or dying so now is a good time to look for a FOSS replacement for Nokia PC Suite and Outlook -- the only reason I run Windows.
Is there any solution (or combination of solutions) that supports synchronising personal information manager (PIM) data -- most importantly names and phone numbers, calendar/schedule and notes -- with any model of cell phone?
EDIT:
SyncEvolution looks promising and there are reports of it working at least adequately with several phones including the interesting for Linux people Nokia N900 but OS-wise it only claims compatibility with ubuntus and debian 4.0, not beloved Slackware; maybe that's more because of what people have tried than because it doesn't work. As the name suggests it works only with Evolution, perhaps not the first choice of email client and PIM.
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May 18, 2010
i had tried several restrict options and disabling the slackware "no serve to anyone" default. i want the slackware system to host the ntp server for other devices to sync with so im not so hard on the remote ntp servers.
Code:
# Sample /etc/ntp.conf: Configuration file for ntpd.
#
[code]....
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Feb 27, 2011
I have two processes that share a piece of memory, and i want to use the shared memory to send data from one process to the other. it's like a simple consumer-producer problem. when the producer fills the shared memory, it waits until the consumer can consume some data in the memory; the consumer needs to wait if there is no data in the memory. The thing gets complicated when both threads are allowed to sleep and wait for the other to wake it up.
i wanted to use condition variable of pthread for synchronization, but it doesn't work in multiple processes. i tried semaphore, but it's quite complicated and i still cannot make it right. I believe it's a common problem and someone should have written similar code before, or maybe the code is even wrapped in a library, but when I search for it on Internet, I only found information about how to share memory between processes. Does anyone know where I can find this kind of code or library?
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Jun 28, 2010
I'd like to get the 13.0 "synchronized to <time server>, stratum <stratum>" messages back on 13.1.
- On 13.0, running ntpd 4.2.4p8, reassuring messages appeared in /var/log/messages like "synchronized to 211.233.84.186, stratum 2".
- On 13.1, running ntpd 4.2.6p1, there are no messages in /var/log/messages to confirm that time is being synchronised.
rc.ntpd on both starts ntpd with the same options. /etc/ntp.conf is identical on both, a "get it working and then make it secure" version:
Code:
cat /etc/ntp.conf | grep -E -v '^$|^#' cat /etc/ntp.conf | grep -E -v '^$|^#'
server in.pool.ntp.org
server asia.pool.ntp.org
server 127.127.1.0
fudge 127.127.1.0 stratum 10
driftfile /etc/ntp/drift
According to Linux Home Networking, synchronization can be checked using ntpq -p. This shows synchronization is working. I would prefer to see that confirmation in /var/log/messages without having to run a command manually to check it. How to get the old messages back?
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Jun 1, 2011
I'm having difficulties with ntpd on my CentOS 5.6 install.
It all starts well; the server connects and synchronizes with a couple of public ntp servers:
[root@toro ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
+ntp.networking4 193.67.79.202 2 u 1 64 377 35.652 47.102 12.349
*deepthought.doc 131.188.3.223 2 u 2 64 377 29.010 44.358 11.585
[Code]....
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Apr 1, 2011
I have several SLES 11sp1 servers and using SMT (Subscription Management Tool) to provide local mirroring and prevent all the unnecessary web traffic to update all these machines.
I found this article which is working out quite nicely to mirror the openSUSE 11.3 Updates which prevents all my openSUSE 11.3 machines from all going out getting the same update.
Code:
[URL]
I am looking to try and do the same with openSUSE 11.4 and with openSUSE 11.4 using the Tumbleweed repos. Has anyone done this or can someone provide some insight on what I need to do. I am thinking I can run this command
Code:
smt-setup-custom-repos --name OpenSUSE_114_Updates --description "OpenSUSE 11.4 Updates" --exturl http://download.opensuse.org/update/11.4/ --productid *don't know what productid
I should use* to provide me with openSUSE 11.4 Updates. For the Tumbleweed repo would I do the same and would that work?
Code:
smt-setup-custom-repos --name OpenSUSE_Tumbleweed --description "OpenSUSE Tumbleweed" --exturl http://download.opensuse.org/repositories/openSUSE:/Tumbleweed/standard/ --productid *don't know what productid I should use*
Again I don't know what productid I should use or if it really even matters, could I use one that is not being used? I am trying to limit how many machines go out to the Internet to pull down updates. I would really like to have one system (SMT) pulll down any new files and all my clients get their updates from the SMT server.
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Apr 13, 2010
I've got a repository (3rd party, but not a launchpad one) in my APT sources list that takes a long time to respond on apt-get update.What I was wondering was if I could keep a local mirror of just that repository, and have apt-get update refer to it instead of the normal one, then leave a cron job to check the normal one for any updates.
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Jun 7, 2010
I would like a seamless way of having personal files encrypted (at this point I am only worried about the home directory) and synchronize these files between different computers and with an external hd.
So far my partial solution is:
1) Default Ubuntu eCryptfs solution;
2) Unison to synchronize between the upper layers of both computers via ssh (operating on the /home/$USER mounted by ecryptfs) and also between one computer and the external HD;
3) Don't know about the external hd.
Reasons:
- I don't want any pain about data loss or data leak if my hardware gets stolen;
- Data in /tmp, /var and swap are not that important for me right now;
- It is very important to synchronize fast, incrementally and properly: propagating deletions rather than reverting and detecting change-change/change-delete conflicts before miss-propagating changes, which as far as I know only Unison is good at;
- Even if I could set the same passphrase on both computers (I guess I can, but Ubuntu does not offer me to choose the ecryptfs passphrase) I want to see the true filenames that are being synchronized;
- If possible I would like to simplify the whole scheme so that each computer is doing its own job seamlessly, and operating on the upper decrypted layer looks simple and robust;
- I would like a more general and easy-to-use scheme for the external device, so other folks use it too;
- If possible I would like ext4 backups, so it remembers file permissions etc... however it would be nice to be able to open it from Windows.
Are (1) and (2) above really good solutions or am I missing something? What are the best solutions for (3)? So far I have seen cryptsetup/palimpset and truecrypt. The more native and floss the better, but being crossplatform is nice. What are the pros and cons, and what's their relation to FreeOTFE and other Windows tools?
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Mar 29, 2011
I am having a situation with an NTPD server.
Code:
remote refid st t when poll reach delay offset jitter
plesk2.datacent .INIT. 16 u - 64 0 0.000 0.000 0.000
91.198.87.118.b .INIT. 16 u - 64 0 0.000 0.000 0.000
core.fr.zeroloo .INIT. 16 u - 64 0 0.000 0.000 0.000
178-26-105-100- .INIT. 16 u - 64 0 0.000 0.000 0.000
and it remains so no matter how long I wait...
Hoping to get better results with ntpdate, I stopped NTPS and tried :
Code:
# ntpdate ntp.skynet.be
29 Mar 09:12:26 ntpdate[4715]: no server suitable for synchronization found
# ntpdate -ud ntp.skynet.be
29 Mar 09:14:02 ntpdate[4814]: ntpdate 4.2.4p4@1.1520-o Sun Nov 22 16:14:35 UTC 2009 (1)
transmit(195.13.23.5)
receive(195.13.23.5) .....
I am running Debian Lenny 64b, and every packages are totally updated. I have 25 identical servers. And there is just one giving me this problem. From what I see, it is not a connection/FW issue since ntpdate get replies from the ntp server (ntp.skynet.be is my isp's stratum 2 ntp server).
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Dec 14, 2010
I've been running Kubuntu (up to 10.10 now) and also OpenSuSE. I have a Palm Pilot that I want to synchronize to the KDE databases for kontact, kaddressbook, korganizer, etc. Until my upgrade to KDE 4.5.4 I was able to use kpilot, but kpilot is no longer being maintained and has been dropped altogether from KDE 4.5.4. So I've been stranded. It seems that both kpilot and jpilot are quite ancient, not having been materially updated for ten years.
One suggestion I've heard is to replace my Palm with an iPhone, but that's not a path I want to take. The iPhone has capabilities (telephony for one) that I don't need but would be paying dearly for. Not only is the iPhone far more expensive than the Palm; it entails that horrendous and extortionate two-year contract with AT&T.
How I can sync my Palm to the KDE databases? One possibility is some combination of akonadi and OpenSync, but there doesn't seem to be support for that yet, let alone a clear explanation as to how to get that combination to work.
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May 6, 2009
I am working with a C++ program consisting of two threads. The first threads receives packets through an UDP unicast connection and stores them in a buffer. The second thread reads the packets from the buffer and sends them through an UDP multicast connection. Both use blocking sockets and share a common buffer and a linked list L1, which are protected by mutexes. The program seemed to work just fine, receiving a packet and sending it almost immediately, but started giving some trouble recently. The synchronization between both thread started failing, and I decided to use a non-blocking socket in the sending thread. As a consequence, sendto() doesn't work in some cases, causing an errno 11 (Resource unavailable).
[Code] ...
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Sep 2, 2010
I've set up a test machine with Ubuntu 10.04. It has two drives making one RAID 1 drive using mdadm. This RAID drive is where /home is mounted. I like to break things just to see what happens and to know what to do to resolve it before it happens for real. So I physically removed one of the drives that made up the RAID 1 (while it was off).
I then rebooted the machine. I thought since it was mirrored then /home would mount correctly using the other mirror. What actually happened was on the Ubuntu splash screen it said there was a problem mounting /home. I skipped the mounting, logged in and looked in /proc/mdstat. It reported one drive that was inactive it did not report the missing drive.
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May 10, 2011
Currently I backing up the MBR, the C and the other partitions to an external USB HDD and from there I restore them if needed. I use the SystemRescueCd and commands like dd if=/dev/sd* of=/mnt/PC_name/backupmbr.1 count=1 bs=512 and ntfsclone --save-image --output /mnt/PC_name/PC_name_c.img /dev/sd*1 etc. I want to clone the HDD the way, however, that I omit the external USB drive. I want to connect the new HDD to the PC and do the cloning directly from one disc to the other.
My questions are:
- Can you provide me with the exact command?
- Is that a difference if the disc is SATA or IDE?
- Can I copy the disc even if the old disc don't wan to boot?
The OS is Windows on the disc I want to clone.
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Feb 11, 2010
I have a mail server on Fedora 8. I would like to have a mirror to this server so that it takes over in case my server goes down.I dont know how to go about it.
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Dec 27, 2010
I want to mirror root hard disk in SUSE LINUX 10.1.I have two 80G hard disks, I searched in google but I did not find any good link to describe this.
Code:
Server1:~ # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda6 16G 1.2G 14G 8% /
udev 1.3G 140K 1.3G 1% /dev
[code]....
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Jan 20, 2010
Is root mirroring is supported in RHEL /RHAS operating systems? If so, how to find out whether the root mirroring is enabled or not?
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Apr 24, 2011
I've always been under the impression that when using the console only a notebook's display is used. Apparently this is not the case as I just booted off of a SystemRescueCD and the display on the notebook was mirrored on my external HDMI connected monitor. I have a feeling this is set somewhere in the kernel, but where?
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Jan 8, 2010
I cant get ntpd to synchronize with the ntp servers. I have a CentOS 5.3 32 bit Virtual Machine. I'm in USA on Pacific Standard Time. Here's all configuration and other important information for troubleshooting. Is there anything wrong with my config? btw, I used wireshark to look at the UDP packets - I dont get any responses from any of the servers back. I only see requests going out from my server, but no response. Is this a firewall Issue? If it is, then do I need to just enable UDP port 123 on the firewall?
[Code]...
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