-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/18/2010 09:37 PM, Peter Jeremy wrote: > Maybe it would be useful if ZFS allowed the "reserved" space to be > tuned lower but, at least for ZFS v13, the "reserved" space seems to > actually be a bit less than is needed for ZFS to function reasonably.
In fact, filling a 1.5 terabyte ZFS disk (leaving the 1.5% implicit reservation alone) reduces my write speed to half (and this is using BIG files >512MB)n. But it seems more a implementation artifact than a "natural law". For instance when we have the block rewrite, we can coallesce free space to be able to find it easily & fast. If I understand correctly, with this "implicit" reservation I don't need (anymore) to create a dummy dataset with a small (64MBytes) reservation to be sure I can delete files, etc., when the disk is full. That was important to have in the beginning of ZFS. Can I forget this "requirement" in modern ZFS implementations?. I think ZFS doesn't "reserves" space for "root", so you better have the "root" (and "/tmp" and "/var", if separate datasets) separate from normal "user fillable" datasets. Is this correct?. - -- 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/ iQCVAwUBS1WiT5lgi5GaxT1NAQJjlAP/eB2yfMGsRObul9lvuD31i3Z6kn43zTGH ZBzSA9BKJS+UZmuWrOm8ncjkKZPiHyozoEEQzf4PpyseiusqGZV25kw6dE1xFrym coRCN3ViUP1oBtXXNNYkm7OEZ5ksZTGVCwCe+rnCcrYPlnYv1I3yd60wb7+Z/r00 qh6ngQuus0o= =UlGT -----END PGP SIGNATURE----- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
