Re: A question about rsync
On Sun, 2007-07-22 at 21:59 -0400, Dan Jenkins wrote: > Depends on the (numerous) options to rsync. Typically (someone correct > me if I'm wrong), rsync uses the size and date/time on the file and a > checksum. This can be modified to ignore times and force all files to be > checksummed. I believe (again, someone correct me if *I'm* wrong) that it only uses a checksum if -c is specified. On another note, if you're using rsync to make backups, cannot more highly recommend using rsnapshot (http://www.rsnapshot.org/) -- A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting annoying in email? Cole Tuininga [EMAIL PROTECTED] http://www.code-energy.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: A question about rsync
Cole Tuininga wrote: > On Sun, 2007-07-22 at 21:59 -0400, Dan Jenkins wrote: > >> Depends on the (numerous) options to rsync. Typically (someone correct >> me if I'm wrong), rsync uses the size and date/time on the file and a >> checksum. This can be modified to ignore times and force all files to be >> checksummed. >> > > I believe (again, someone correct me if *I'm* wrong) that it only uses a > checksum if -c is specified. > That's what I wasn't sure of. I know rsync uses the checksum in the algorithm to identify differing chunks of the file when transferring it, but wasn't sure about whether it did the whole file. Thanks for the clarification. > On another note, if you're using rsync to make backups, cannot more > highly recommend using rsnapshot (http://www.rsnapshot.org/) > Oh, thanks for that information. I've been writing scripts to do that. That's a much simpler solution. -- Dan Jenkins ([EMAIL PROTECTED]) Rastech Inc., Bedford, NH, USA --- 1-603-206-9951 *** Technical Support Excellence for over a Quarter Century ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
[GNHLUG] August 6th CentraLUG: Special Location, Roger Trussell presents Writing FireFox Extensions
The monthly meeting of CentraLUG, the Concord/Central New Hampshire chapter of the Greater New Hampshire Linux Users Group, occurs on the first Monday of each month starting at 7 PM. Due to summer hours at the NHTI Library, we will be meeting at the Sybase offices, 6 Loudon Road, Suite 501, Concord, thanks to member (and Sybase employee) Larry Cook. DIRECTIONS: From Interstate 93, take exit 14 and head east over the Merrimack River. Immediately after the bridge, take the first right. Drive straight back to the cornfield, then turn right and then right again to get to the south end of the building. Walk around the building to the right to come in the front (east) entrance. Take the elevator to the fifth floor. Straight off the elevator is Sybase. Enter and turn left. At the end of the hallway is the conference room. Google Map: http://tinyurl.com/2rtc8k Open to the public. Free admission. Tell your friends. Roger Trussell will present a session on building Firefox extensions. Firefox extensions are small zipped blocks of code that add new functionality to Firefox, from a simple toolbar button to a completely new feature. Extensions allow Firefox to stay small and unbloated. Extensions give content providers another way to make certain features more accessible to their end-users. We will see some quick examples of how to build extensions for Firefox 2.x using XML and JavaScript. We will also see a demonstration of some useful extensions available for web content developers. Roger Trussell is a programmer with over five years of experience in a variety of support roles for health care, software, research, and manufacturing environments. He has worked at many companies throughout the Upper Valley such as DHMC, isee systems, inc. (formally known as High Performance Systems, Inc.), and Timken Aerospace. Roger holds a Bachelor of Science degree in Computer Science from Rensselaer Polytechnic Institute in Troy NY. One of Roger's main interests is bridging the gap between programmers and end-users. He has worked on software installer technology and he has worked in end-user support roles. More details at about this meeting and the group are available at http://www.centralug.org and http://www.gnhlug.org as I learn them! Hope to see you there! -- Ted Roche Ted Roche & Associates, LLC http://www.tedroche.com ___ gnhlug-announce mailing list [EMAIL PROTECTED] http://mail.gnhlug.org/mailman/listinfo/gnhlug-announce/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: A question about rsync
On 7/23/07, Cole Tuininga <[EMAIL PROTECTED]> wrote: > On another note, if you're using rsync to make backups, cannot more > highly recommend using rsnapshot (http://www.rsnapshot.org/) Huh! I'm using: http://backuppc.sourceforge.net/ And I highly recommend it. I just glanced at rsnapshot and after a very quick glance it looks like the same thing. Anyone have experience with or knowledge of both these packages? I'd be interested to know the differences. I have been very happy with Backuppc, esp. since I had already started to write some scripts to do the same thing. ;-) Cheers! Ty -- Tyson D Sawyer A strong conviction that something must be done is the parent of many bad measures. - Daniel Webster ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
RE: A question about rsync
I second backuppc. Really really good software. I've never used rsnapshot (looks like a web interfaceless backuppc), but when I used backuppc, it's only real failing was backup to tape. I could never get archive mode running correctly. I ended up taring backuppc's file repository to tape. If the archive tree was larger than a tape I would have had issues retrieving single files, but all and all it worked pretty well. The other issue was locked files over smb. Outlook data file (.pst?) wouldn't backup correctly because they were opened in some odd mode. I heard a bunch of hacks to make the backup work, from wmi calls to software that clones the file somehow. Maybe newer versions of outlook do something a bit easier to backup. Best Patrick -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tyson Sawyer Sent: Monday, July 23, 2007 4:14 PM To: gnhlug-discuss@mail.gnhlug.org Subject: Re: A question about rsync On 7/23/07, Cole Tuininga <[EMAIL PROTECTED]> wrote: > On another note, if you're using rsync to make backups, cannot more > highly recommend using rsnapshot (http://www.rsnapshot.org/) Huh! I'm using: http://backuppc.sourceforge.net/ And I highly recommend it. I just glanced at rsnapshot and after a very quick glance it looks like the same thing. Anyone have experience with or knowledge of both these packages? I'd be interested to know the differences. I have been very happy with Backuppc, esp. since I had already started to write some scripts to do the same thing. ;-) Cheers! Ty -- Tyson D Sawyer A strong conviction that something must be done is the parent of many bad measures. - Daniel Webster ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: A question about rsync
On 7/23/07, Flaherty, Patrick <[EMAIL PROTECTED]> wrote: > The other issue was locked files over smb. Outlook data > file (.pst?) wouldn't backup correctly because they were opened in some > odd mode. In general, files can only be reliably backed up if they are quiescent. Otherwise, you're likely to get the file in an inconsistent state when the backup software grabs it. This is true even for filesystem-level snapshots and "open file backup" products, let alone regular file I/O (which rsync uses, and it looks like BackupPC does also). While a snapshot mechanism may be able to ensure the whole file is consistent as stored at an instant in time, if that instant happens to be when the application is in the middle of updating it, you're still going to end up with a scrambled file. Essentially, upon restore, the application will see things as if you had killed the power to the system at the instant the backup ran. Depending on the nature of the file and the intelligence of the application, recovery at that point may be easy, hard, or impossible. PST files tend to fall more towards the "hard" end of the spectrum. -- Ben ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
[GNHLUG] MerriLUG/Nashua - 16 Aug - Todd Underwood on ZFS
Who : Todd Underwood, Renesys What: ZFS -- The Last Word in File Systems Where: Martha's Exchange Date: Thur 16 Aug 2007 Time: 6:00 PM for dinner, 7:30 PM for meeting proper Next month's MerriLUG (Nashua) meeting will host Todd Underwood speaking on ZFS. He will present a survey of what's out there, what their needs are, and how ZFS helps meets those needs, and cover ZFS features and some technical details. This is a preliminary announcement; details and RSVP info will follow in a later notice. - About ZFS - ZFS is an advanced file storage system, featuring such buzzwords as: A pooled storage model (no fixed partitions), transactional semantics, copy-on-write (so on-disk state is always valid), error checking and correction of data, background consistency checking, instantaneous snapshots and clones, fast native backup and restore, built-in compression, and ease-of-use. And it's Open Source. How can you beat that? http://www.opensolaris.org/os/community/zfs/whatis/ - About the presenter - Todd Underwood is Vice President of Operations and Professional Services at Renesys (http://www.renesys.com/). Renesys is in the business of collecting, analyzing and archiving data about what's happening on the Internet. That demands fast and reliable storage for of tens of terabytes of stored data. http://www.renesys.com/about/management.shtml#a-todd - About the group - MerriLUG is the Merrimack Valley Linux User Group, and is a chapter of GNHLUG, the Greater NH Linux User Group. Heather Brodeur is the LUG coordinator, with essential assistance from Jim Kuzdrall. MerriLUG meets the third Thursday of every month. You can find out more about MerriLUG and GNHLUG at the http://www.gnhlug.org/ website. Meetings are open to all, and are held at Marth'a Exchange in Nashua, NH. We meet downstairs for dinner starting at around 6:00 PM, and move upstairs for the meeting proper at 7:30 PM. (Feel free to skip either part.) The meeting proper ends around 9ish, but it's not uncommon to find hangers-on there until 10 or later. ___ gnhlug-announce mailing list [EMAIL PROTECTED] http://mail.gnhlug.org/mailman/listinfo/gnhlug-announce/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
a song about Perl on YouTube by Pudge
http://www.youtube.com/watch?v=Mxk5RMQF6Js ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
