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Special Forums Hardware Filesystems, Disks and Memory Differences between SAN and NAS Post 43341 by Perderabo on Saturday 15th of November 2003 04:09:50 PM
Old 11-15-2003
I wanted to spend some time on our systems that use SAN before I tried to tackle this one. I don't usually work on the SAN based boxes.

As a System Administartor, SAN seems to me to be amazingly similiar to SCSI or PCI. The disks appear to be local in every respect. I can and must build filesystems on them. We even have a rack of servers with no local disks. They boot from SAN. Actually, if I want, I can use the disk area without a filesystem. We do that for swap and stuff like database chunks. . If I build a HP-UX filesystem on a SAN disk, I can mount it only on another HP-UX system. And we do that only for failover, we never attempt to use a filesystem from two systems at once. SAN "disks" are like RAID "disks". There is fault tolerance behind the scenes that is largely invisible to the OS.

Our NAS uses the nfs protocol. Many clents can mount the filesystems at once, even from very different OS's. Etc... I'm sure you guys know nfs.
 

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USERMOUNT(1)						      General Commands Manual						      USERMOUNT(1)

NAME
usermount - A graphical tool to mount, unmount and format filesystems. SYNOPSIS
usermount [ options ] userformat [ options ] device DESCRIPTION
usermount is a graphical tool to allow users to easily manage removable media, such as floppy disks or zip disks. When the tool starts up, it scans /etc/fstab for all filesystems that have been configured to allow users to mount and unmount them. The filesystem can be mounted or unmounted by pressing the toggle button labeled Mount. Also, if the user has the appropriate permissions for the device, the Format button will be active. This allows the user to format disks using fdformat and create a new filesystem of the type listed (using mkfs with the appropriate option). Naturally, the user will be prompted for confirmation before actually destroying data on the device. Note that if a device is already mounted, the format button is inactive for all entries that share the same device. When run as root, usermount displays all of the entries in /etc/fstab rather than just the ones with the user option. Invoking userformat device allows formatting device, as if by selecting device in the userformat window, and by clicking the Format button. OPTIONS
This program has no command line options of it's own, but it does take the standard X program options like -display and such. See the X(1) man page for some of the common options. FILES
/etc/fstab The system file describing the mountable filesystems. SEE ALSO
mount(8), fdformat(8), mkfs(8), fstab(5) X(1) BUGS
Mount entries with a filesystem type of iso9660 are outright considered CD-ROMs and the format button is always disabled. Mount entries for swap files or partitions are also ignored. A nice feature might be to allow root to turn swap on and off for swap parti- tions. AUTHOR
Otto Hammersmith <otto@redhat.com> Red Hat March 13 2007 USERMOUNT(1)
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