From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261551AbUDISNM (ORCPT ); Fri, 9 Apr 2004 14:13:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261597AbUDISNM (ORCPT ); Fri, 9 Apr 2004 14:13:12 -0400 Received: from twin.uoregon.edu ([128.223.214.27]:13461 "EHLO twin.uoregon.edu") by vger.kernel.org with ESMTP id S261551AbUDISNG (ORCPT ); Fri, 9 Apr 2004 14:13:06 -0400 Date: Fri, 9 Apr 2004 11:12:57 -0700 (PDT) From: Joel Jaeggli X-X-Sender: joelja@twin.uoregon.edu To: Martin Knoblauch cc: linux-kernel@vger.kernel.org Subject: Re: your mail In-Reply-To: <20040409175403.91924.qmail@web13904.mail.yahoo.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 9 Apr 2004, Martin Knoblauch wrote: > >I was wondering if for linux or better for a linux filesystem > >there is something like dynamic swapping of files possible. > >For explanation: I habeaccess to an Infinstor via NFS and > >linux is runnig there. This server has a nice funtion I'd > >like to have: if there are files that are not used for a > >specified time (i.e. 30 days) they are moved to another storage > >(disk and after that to an streamer tape) and are replaced > >by some kind of 'link'. So if you look at your directory you > >can see everything that was there, but if you try to open it, > >you have to wait a moment (some seconds if the file was > >swapped to another disk) oder just another moment (some > >minutes if the file is on a tape) and then it restored at > >it's old place. > > > > Good description of a HSM (Hierarchical Storage Management) > System. > > >So is there anything which provides such a feature? By now > >I have a little script that moves such files out of the way and > >replaces them by links. But restoring is somewhat harder and > >it's not automatic. > > > >Any ideas? > > part of the thing for us (my group at UO) right now, is tape robots aren't cheaper than disk, so a lot of our offline/near-line backup is slowly moving in that direction... 1TB lto jukeboxs cost order of $8-9K ea and the driver for your commercial tabe-backup software can cost nearly that much on top of it, but I can put 3.5TB of disk in a 5u enclosure and locate in some other building for a similar price if not less. Even If buy it in something like a netapp filer it's still only around $10,000 a TB so HSM systems involving tape don't really have the same apeal as when we were paying $1200ea for 4GB scsi disks. If I had sunk costs in something like a storagetek powerhorn with 6000 tape capacity I might think a little differently but I suspect your situation is closer to mine that it is to the sorts of people who buy those. > Really depends. As far as I know thare are no "free" HSM Systems > out there for Linux The only one that I am faintly familiar with > that runs on Linux is StorNext from ADIC. Definitely not free. > > DMF/Irix may now be ported to Linux (Altix/IA64), but I doubt > it will be free. > > Sun is most likely not (yet) interested in doing a Linux port > of SAM-FS (there are still Sparc/Solaris Machines to sell). > And it won't be free (my guess). > > Tivoli/IBM and UniTree are also sold for Linux. Again "sold" is > the important word > > Martin > > > ===== > ------------------------------------------------------ > Martin Knoblauch > email: k n o b i AT knobisoft DOT de > www: http://www.knobisoft.de > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- -------------------------------------------------------------------------- Joel Jaeggli Unix Consulting joelja@darkwing.uoregon.edu GPG Key Fingerprint: 5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2