![]() You can connect automatically to the LFE that has the lowest load by using the "lou" or "lfe" hostnames in your ssh command line: ssh lfe or ssh lou. Lou's four hosts, known as Lou front-end systems ( LFEs), are designated as lfe. Lou uses a parallel Data Migration Facility ( DMF) system to provide high speed and bandwidth for data transfers between Lou's disks and tapes. The Lou mass storage system is an Intel Xeon Gold 6154 "Skylake"-based cluster combined with a Spectra Logic tape storage archive. Use the -p option to preserve the timestamp on the file.For safe, long-term data storage, transfer your files to the Lou mass storage system, which allows you to retrieve your stored files quickly and securely whenever you need them. cpĬp is a Unix command for copying files between two locations (for example, two different directories of the same filesystem or two different filesystems such as NFS, CXFS or Lustre).Ĭp is available on all NAS systems except the secure front ends ( SFEs). Some benchmarks done by NAS staff show that cxfscp is typically 4-7 times faster than cp for large files (2+ GB) and can achieve up to 650 MB/sec.įor more information, read man cxfscp. Lfe 5% cxfscp -p -bo /u/ username/data* /nobackupp4/ username/ data_dir This is an easy way to transfer files between Lou and Pleiades without the need for scp or scp.Įxamples lfe 5% cxfscp -rp -bi /nobackupp4/ username/ testdir_a /u/ username/tests The command cxfscp can be issued on either of these hosts to copy large files between the LFE's CXFS home file system and Pleiades's /nobackup. The Pleiades Lustre filesystems (/nobackupp X) are mounted on lfe. It can be significantly faster than cp on CXFS filesystems since it uses multiple threads and large direct I/Os to fully utilize the bandwidth to the storage hardware.įor files less than 64 kilobytes in size, which will not benefit from large direct I/Os, cxfscp will use a separate thread for copying these files using buffered I/O similar to cp. cxfscpĬxfscp is a program for quickly copying large files to and from a CXFS filesystem, such as the Lou front-end (LFE) home file system. ![]() Using the -hosts option, it has been measured to achieve up to 5.0 GB/sec on 8 hosts.įor more information, see Shift File Transfer Overview. Shiftc utilizes mcp, when available, so it can be up to 10 times faster than cp for large files (2+ GB) and can achieve up to 1.8 GB/sec on a single host. Pfe 27% shiftc $HOME/ filename /nobackup/ username The command shiftc can be used as a drop-in replacement for cp at any time on any system on which it is installed.Įxamples lfe 5% shiftc /nobackup/ username/filename $HOME Shiftc is installed on the Pleiades and Lou front-end systems (PFEs and LFEs). Shift utilizes a variety of underlying file transports to achieve maximum performance for files of any size on any file system. Shift ( shiftc) is a NAS-developed tool for performing automated local and remote file transfers. The following file transfer commands can be used when both the source and destination locations are accessible on the same host where the command is issued. ![]() For large file transfers within the NAS enclave, use the commands shiftc, mcp, or cxfscp.
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