[linux-lvm] vgscan vs vgcfgrestore
rschwartz at boscovs.com
Wed Aug 18 02:53:48 UTC 2004
Forgive me for writing in English. As I come from the United States I am embarassingly uni-lingual. I have been working with LVM for several months now and finally have had the opportunity to get into the guts of the lvm configuration. I am preparing myself for the situation where my LVM environment gets corrupted in some manner. Actually, last week I encountered a problem with LVM and was unable to quickly recover so I ended up simply rebuilding the LVM PV's, VG's and LV's and restoring data. Fortunately, it was an easy restore. I have been comparing the vgscan utility with vgcfgrestore. In a test environment I have deleted the /etc/lvm* stuff and even deleted the /dev/lvm* stuff and successfully recovered the VG and LV by simply doing a vgscan. Whew... nice... I understand vgcfgbackup and vgcfgrestore but am not sure when I would need to use the configuration backup. The VGDA as I understand it is stored on the PV's. If I have the PV's intact I therefore have the VGDA and hence am able to recover using vgscan. When would I need to use vgcfgrestore? I have found much information on LVM on the web but nothing that really pinpoints my question. If there is something out there that I can refer to, please tell me.
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