Sharing a Subset of Data Between 2 Sites? 23
eldrich asks: "We have two labs: a main lab (lab 1) has 1.2Tb of on-line data storage -- two machines with 600Gb RAID-5s hung off of them. These happily service about 30 Linux machines via NFS over fast ethernet. There are 5-6 WinXP machines that connect via SMB and Samba. The lab is on a private network with a single firewall between it and the world, and we use LDAP for practically everything (hostname, usernames, password, autofs, etc). The students' lab (lab 2) is 40 miles away, with 8 workstations and 2 WinXP machines. This lab also has a small RAID-5 Linux server with 180GB space which serves via NFS and Samba. Sometimes we have people from lab 2 at lab 1 and while they are at the main lab, they need their files. What I want to do is make lab 2's 180GB RAID a subset cache of the 1.2Tb one in lab 1. This puts everyone's main storage at lab 1 (which is backed up weekly) but a local copy can be cached on the lab 2 raid system. This gives the students a local copy for fast access, but all the safety of the backups made from our system. Does anyone know of a filesystem or programs that can help with this?"