Date: Wed, 9 Sep 2015 16:51:51 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions@freebsd.org Subject: Re: Storage question Message-ID: <55F05597.7070607@infracaninophile.co.uk> In-Reply-To: <55F04D78.8070508@hiwaay.net> References: <55EF3D23.5060009@hiwaay.net> <20150908220639.20412cbd@gumby.homeunix.com> <55EF5409.8020007@yahoo.com> <55EFC2DA.3020101@hiwaay.net> <08B351DD-AA48-4F30-B0D6-C500D0877FB3@lafn.org> <55F02DC8.7000706@hiwaay.net> <20150909150626.5c3b99e5.freebsd@edvax.de> <55F031A0.40500@hiwaay.net> <20150909145820.c3b48aafad4f70553c1c1fd8@sohara.org> <55F0451A.5080709@hiwaay.net> <20150909160005.d3b84775c3d0748014a871e5@sohara.org> <55F04D78.8070508@hiwaay.net>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --0pndWGgEVU0MwSeQDG3D2FH8DTqq9x2Tu Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 2015/09/09 16:15, William A. Mahaffey III wrote: > I have heard that filling your zpool is a *BAD* thing, but it can be fo= r > any FS, just maybe a bit worse for ZFS. I am going to study that option= > a bit more. The online docs all seem to show swap within the zpool as > well, does that work OK, performance wise ? It would simplify > installation, however I am planning to script that, so a bit of 'extra'= > effort for separate swap partitions is not an issue. I have always > thought that separate swap partitions directly kernel managed were the > best for swap performance if/when it gets down to that, no ? Filling the zpool completely is tricky because it can be hard to recover. The trick is (a) don't do that; (b) create space by *truncating* a large file if it happens. Or use FreeBSD 10.x which has a 3% space reservation, similarly to how UFS does. However, you'll find that ZFS performance drops quite a bit when you hit somewhere north of about 75% full. Yes, you should swap to a dedicated partition, rather than swapping within ZFS. I think, BICBW, that you can still get into a deadlock where you need extra memory to handle an out-of-memory condition. Just use the system installer to set up your drives and zpool -- it makes it ridiculously easy. Cheers, Matthew --0pndWGgEVU0MwSeQDG3D2FH8DTqq9x2Tu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQJ7BAEBCgBmBQJV8FWdXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQxOUYxNTRFQ0JGMTEyRTUwNTQ0RTNGMzAw MDUxM0YxMEUwQTlFNEU3AAoJEABRPxDgqeTnO1YP91ZEOF0hoFk7tnqx7xFZ/7FI C+d56ziw76eqEjP4g5y8r/AyWxAWx8qOx2jatRdynvDRetSDmDu3scvpxp/dUbVU 0t/B2gpJ3LxUThOM/M78aOVdBxQhdRl+f7pZcUu6gDjW6t4i0CRwqwOysvpVm8JL 20XxbtEXGEDkQceq/wHnE2+KKQ53syGiHWMuJcASteXPT07MsFPbBo+csRP5TKmS iMtmpRwrtIYjegBBDLI19W5w8Cbz6psXkcuigCKnJroUU34DyrI2kzv7WPqY8qFr XbbQnW9vsm7EbMqYmkaJl0j2hi9HEITKrfQmG6V3V69/TBKA8UIL4Ec+hKSfgNjz Xe2+49vLef3gzHIZJRrSdOVHDyxOvpSx3vxNi4tSI1yzEx/3juBdafkB5p7FdCph 3cNlN+XJocPM07mwBfSLjSn/+Js7lkUmbkLINnLhFAPYNw0hlWCGEFkfg8JgytQX cUdx3W3HR5DxnWFc64QpsNX0CyxXJtX8mkD+3z1syGmAQg39NitLpTsVuEggu1vn qrbTS+7JtNSXLXzuNioWpzO+F/Q6h4OqVMvNKWcX3OJg1CRP4js/A0xz00UWv8rz RlDEhjOcYFssafWtMcJnifDFq4PK856/z5Ze7fV98On0hMoPA4INj2TV4YRrzGL/ g9Cwi5KUnp/zs8hU9mk= =yZuH -----END PGP SIGNATURE----- --0pndWGgEVU0MwSeQDG3D2FH8DTqq9x2Tu--
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