-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/18/2010 05:11 PM, David Magda wrote: > On Jan 18, 2010, at 10:55, Jesus Cea wrote: > >> zpool and zfs report different free space because zfs takes into account >> an internal reservation of 32MB or 1/64 of the capacity of the pool, >> what is bigger. >> >> So in a 2TB Harddisk, the reservation would be 32 gigabytes. Seems a bit >> excessive to me... > > 1/64 is ~1.5% according to my math. > > Ext2/3 uses 5% by default for root's usage; 8% under FreeBSD for FFS. > Solaris (10) uses a bit more nuance for its UFS:
That reservation is to preclude users to exhaust diskspace in such a way that ever "root" can not login and solve the problem. > 32 GB may seem like a lot (and it can hold a lot of stuff), but it's not > what it used to be. :) I agree that is a lot of space but only 2% of a "modern disk". My point is that 32GB is a lot of space to reserve to be able, for instance, to delete a file when the pool is "full" (thanks to COW). And more when the minimum reserved is 32MB and ZFS can get away with it. I think that could be a good thing to put a cap to the maximum implicit reservation. - -- Jesus Cea Avion _/_/ _/_/_/ _/_/_/ j...@jcea.es - http://www.jcea.es/ _/_/ _/_/ _/_/ _/_/ _/_/ jabber / xmpp:j...@jabber.org _/_/ _/_/ _/_/_/_/_/ . _/_/ _/_/ _/_/ _/_/ _/_/ "Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/ "My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/ "El amor es poner tu felicidad en la felicidad de otro" - Leibniz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQCVAwUBS1SLs5lgi5GaxT1NAQJkPgP+NGg1iKbNX3BzHXJjYcFLYpVNA376Ys79 VHDbElKlCAzIo80ZqW1gHQpOumUzUCZaR910+0e+0vpUzL81hHQ9wncS8BBhmXZN Hp3jA39zzB7JjvQxJ9K/CWxbg3O4Nqi+HTcez3sczyg5dx6k1aSf05MgNPt8jtvJ VNbuQ1hdy7o= =qxDK -----END PGP SIGNATURE----- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
