>>1 TB ==> 2MB bitmap >> >>I guess that is small enough.
Oh yes, no problem ! ----- Mail original ----- De: "Dietmar Maurer" <[email protected]> À: "Alexandre DERUMIER" <[email protected]> Cc: [email protected] Envoyé: Mercredi 14 Novembre 2012 05:50:13 Objet: RE: [pve-devel] [PATCH 1/4] RFC: Efficient VM backup for qemu > > Do you keep some blocks maps in memory ? (if yes, what is the memory > > usage with big volume?) > > Yes, we use a bitmap, one bit for one cluster (cluster size = 65536 bytes) > > 1 TB ==> 16MB bitmap > > 2^40/2^16 = 2^(40-16) = 2^24 Oh, just noticed that this is the number of bits (not bytes), so you need to divide above result by 8: 1 TB ==> 2MB bitmap I guess that is small enough. _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
