<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Hi Roy, <blockquote cite="mid:BE6893A3-3CF3-4B26-B23D-3951C1BF5034@karlsbakk.net" type="cite"> It's a good idea, but given the current traffic on the lessfs mailing list, I'm not sure if much work is done. I have been a member of that list since June 1 and haven't received more than one message, which was the one I wrote myself. </blockquote> Almost all the traffic is on the forum - open discussion. Only one person posted to the mailing list. ;-) <blockquote cite="mid:BE6893A3-3CF3-4B26-B23D-3951C1BF5034@karlsbakk.net" type="cite">If done smartly, this may perhaps be possible, but the problem is the filesystem's metadata. Is this going to be dedup'ed? How much will this take? A simple backup will update atime on all the files backed up, and although atime isn't always wanted or needed, the problem occurs elsewhere.</blockquote> Typically the meta data on production systems is approx 10%~20% of the deduplicated stored data. Stored data is on my systems 40x less then the data written to the filesystem. For example, from a real life backup server making dozens of backups each day: <tt># df -h Filesystem Size Used Avail Use% Mounted on /dev/cciss/c0d0p3 9.7G 2.4G 6.9G 26% / /dev/cciss/c0d0p1 99M 23M 72M 24% /boot tmpfs 7.9G 0 7.9G 0% /dev/shm /dev/cciss/c0d0p4 246G 6.0G 241G 3% /meta /dev/cciss/c0d1p1 274G 73G 202G 27% /blockdata /dev/cciss/c1d0p1 4.1T 1.5T 2.7T 35% /data lessfs 4.1T 1.5T 2.7T 35% /pooldata [root@lessfssrv pooldata]# du . -s -h 31T . [root@lessfssrv pooldata]# ls -alh /data/current/ total 314G drwxr-xr-x 2 root root 26 Jun 1 00:12 . drwxr-xr-x 6 root root 59 Jun 1 00:12 .. -rw-r--r-- 1 root root 314G Jun 22 14:26 blockdata.tch [root@lessfssrv pooldata]# ls -alh /meta/current/ total 1.4G drwxr-xr-x 2 root root 63 Jun 1 00:12 . drwxr-xr-x 6 root root 59 Jun 1 00:12 .. -rw-r--r-- 1 root root 1.3G Jun 22 14:52 blockusage.tch -rw-r--r-- 1 root root 89M Jun 22 14:45 dirent.tcb -rw-r--r-- 1 root root 89M Jun 22 14:52 metadata.tcb</tt> Mark. <blockquote cite="mid:BE6893A3-3CF3-4B26-B23D-3951C1BF5034@karlsbakk.net" type="cite"> roy -- Roy Sigurd Karlsbakk (+47) 97542685 <a class="moz-txt-link-abbreviated" href="mailto:roy@karlsbakk.net">roy@karlsbakk.net</a> <a class="moz-txt-link-freetext" href="http://blogg.karlsbakk.net/">http://blogg.karlsbakk.net/</a> -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. _______________________________________________ linux-lvm mailing list <a class="moz-txt-link-abbreviated" href="mailto:linux-lvm@redhat.com">linux-lvm@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/linux-lvm">https://www.redhat.com/mailman/listinfo/linux-lvm</a> read the LVM HOW-TO at <a class="moz-txt-link-freetext" href="http://tldp.org/HOWTO/LVM-HOWTO/">http://tldp.org/HOWTO/LVM-HOWTO/</a> </blockquote> </body> </html>