Linux Storage system: looking for advices Post: 302384545

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Special Forums Hardware Filesystems, Disks and Memory Linux Storage system: looking for advices Post 302384545 by pludi on Tuesday 5th of January 2010 04:44:33 PM

01-05-2010

Registered User

No, it's not possible with LVM alone. LVM is designed to simplify the management of multiple, different devices by grouping them together. Bonus is a slight speed improvement. If you loose one drive with LVM, the data on it is gone for good too, but it's easy to extend the size.

RAID, on the other hand, is designed not to simplify drive management, but to ensure data reliability. It's not trivial to manually represent multiple RAIDs as one storage, but if one device fails you'll have no data loss.

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vgscan

VGSCAN(8)                                                     System Manager's Manual                                                    VGSCAN(8)

NAME

       vgscan - scan all disks for volume groups and rebuild caches

SYNOPSIS

       vgscan [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--mknodes] [-P|--partial] [-v|--verbose]

DESCRIPTION

       vgscan  scans all SCSI, (E)IDE disks, multiple devices and a bunch of other disk devices in the system looking for LVM physical volumes and
       volume groups.  Define a filter in lvm.conf(5) to restrict the scan to avoid a CD ROM, for example.

       In LVM2, vgscans take place automatically; but you might still need to run one explicitly after changing hardware.

OPTIONS

       See lvm for common options.

       --mknodes
              Also checks the LVM special files in /dev that are needed for active logical volumes and creates any missing ones and removes unused
              ones.

SEE ALSO

       lvm(8), vgcreate(8), vgchange(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                               VGSCAN(8)