Re: ZFS on small systems
2009/9/17 krad kra...@googlemail.com: 2009/9/17 Ruben de Groot mai...@bzerk.org On Thu, Sep 17, 2009 at 04:35:37PM +0200, Anselm Strauss typed: Thanks for your advice, Steve. I looked a bit at the source code and in /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c and I found this: /* set min cache to 1/32 of all memory, or 16MB, whichever is more */ arc_c_min = MAX(arc_c / 4, 6418); Could this mean that 16 MB are already enough to run ZFS? I seriously doubt it. Sun dont recommend it on a system with 1 gb of ram, 2 or more is preferred though. I believe you can install OpenSolaris ( OS by default only installs into zfs) with as little as 768M, but it will (in my exp) run terribly. Even with 4G on a dual-core 64bit lap-top it's pretty sluggish: like FreeBSD 7 on a 300mHz p2 sluggish. -- -- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
ZFS on small systems
Hi, I'm interested in using ZFS on one of my small systems with 256 MB of RAM and 4 GB flash disk. Since ZFS is now considered production ready on FreeBSD I would like to use it as root filesystem and profit mainly from the cool snapshot features for easy backups. I found multiple recommendations to run ZFS only on systems with enough resources. But is this only a requirement if you want good performance or also for ZFS to function properly at all? Thanks for any thoughts on that. Anselm ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: ZFS on small systems
Anselm Strauss wrote: Hi, I'm interested in using ZFS on one of my small systems with 256 MB of RAM and 4 GB flash disk. Since ZFS is now considered production ready on FreeBSD I would like to use it as root filesystem and profit mainly from the cool snapshot features for easy backups. I found multiple recommendations to run ZFS only on systems with enough resources. But is this only a requirement if you want good performance or also for ZFS to function properly at all? I've found that on the i386 arch, that at minimum you need 756M of memory to do anything really useful. Now, I don't know if this has changed or not, but I doubt that the box would be useful for anything with only 256M. With that said, I can keep a box running at max disk r/w for hours on end with 2GB, and 1536M allocated/reserved for ZFS. Perhaps however that there have been enhancements introduced that I don't know about, that allow ZFS to operate in such a small memory address space, but for some reason I doubt it. If I'm wrong, someone will let us know ;) Steve smime.p7s Description: S/MIME Cryptographic Signature
Re: ZFS on small systems
Thanks for your advice, Steve. I looked a bit at the source code and in /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c and I found this: /* set min cache to 1/32 of all memory, or 16MB, whichever is more */ arc_c_min = MAX(arc_c / 4, 6418); Could this mean that 16 MB are already enough to run ZFS? On Thu, Sep 17, 2009 at 2:26 PM, Steve Bertrand st...@ibctech.ca wrote: Anselm Strauss wrote: Hi, I'm interested in using ZFS on one of my small systems with 256 MB of RAM and 4 GB flash disk. Since ZFS is now considered production ready on FreeBSD I would like to use it as root filesystem and profit mainly from the cool snapshot features for easy backups. I found multiple recommendations to run ZFS only on systems with enough resources. But is this only a requirement if you want good performance or also for ZFS to function properly at all? I've found that on the i386 arch, that at minimum you need 756M of memory to do anything really useful. Now, I don't know if this has changed or not, but I doubt that the box would be useful for anything with only 256M. With that said, I can keep a box running at max disk r/w for hours on end with 2GB, and 1536M allocated/reserved for ZFS. Perhaps however that there have been enhancements introduced that I don't know about, that allow ZFS to operate in such a small memory address space, but for some reason I doubt it. If I'm wrong, someone will let us know ;) Steve ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: ZFS on small systems
On Thu, Sep 17, 2009 at 04:35:37PM +0200, Anselm Strauss typed: Thanks for your advice, Steve. I looked a bit at the source code and in /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c and I found this: /* set min cache to 1/32 of all memory, or 16MB, whichever is more */ arc_c_min = MAX(arc_c / 4, 6418); Could this mean that 16 MB are already enough to run ZFS? I seriously doubt it. Ruben ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: ZFS on small systems
2009/9/17 Ruben de Groot mai...@bzerk.org On Thu, Sep 17, 2009 at 04:35:37PM +0200, Anselm Strauss typed: Thanks for your advice, Steve. I looked a bit at the source code and in /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c and I found this: /* set min cache to 1/32 of all memory, or 16MB, whichever is more */ arc_c_min = MAX(arc_c / 4, 6418); Could this mean that 16 MB are already enough to run ZFS? I seriously doubt it. Ruben ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org Sun dont recommend it on a system with 1 gb of ram, 2 or more is preferred though. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
