Date: Wed, 14 Jan 2015 17:47:59 +0000 From: =?utf-8?B?S2FybGkgU2rDtmJlcmc=?= <karli.sjoberg@slu.se> To: Freddie Cash <fjwcash@gmail.com> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: How many ram... Message-ID: <6a3129720b4a439994841c28df676cd1@exch2-4.slu.se>
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Den 14 jan 2015 18:28 skrev Freddie Cash <fjwcash@gmail.com>: > > On Wed, Jan 14, 2015 at 9:00 AM, Albert Shih <Albert.Shih@obspm.fr> wrote: > > > Le 14/01/2015 à 10:50:18-0600, Linda Kateley a écrit > > > I will say one more thing.. I also have a customer who uses zfs for > > > security camera storage. The cameras deliver 100's of k bytes per > > > minute... But they save the data for a very very very long time. That > > > kind of system would need very little ram(maybe 8GB) but lots and lots > > > of disk. > > > > Thanks you very much. > > > > May I ask you something (feel free to not answer of course ). I saw on your > > > > > >> 32GB ram. http://kateleyco.com/?p=815 > > > > you have install I quote > > > > «hey will have 252 4TB drives in 6 45-drive chassis with multiple > > controllers» > > > > do you have any idea how many pool they have ? how many disk they put in > > one raid ? how many raid they put in one pool ? > > > > Actually I've one server a very big pool (I known some tell me it's too > > big) with 72 disks in 6 raidz2. > > > > We have two storage systems with 90 harddrives each (2 TB drives). These > are setup with 2 45-drive 4U JBOD chassis each, and a 2U head unit with > SSDs for the OS and L2ARC/ZIL, and the SATA controllers. The way the > hardware is configured, they can each handle another 2 JBOD chassis without > daisy-chaining anything. > > Using 6-disk raidz2 vdevs, for a total of 15 raidz2 vdevs per storage > pool. > > These are backup systems and an off-site replication system, so storage > throughput and IOps wasn't super critical, while storage space and > manageability were. They only have gigabit NICs, and can saturate those > while running backups or "zfs send" / "zfs recv". > > They do have 128 GB of RAM, though, more as a "get it now while it's cheap > instead of waiting until we need it" than anything. And they have dual > 8-core AMD Opteron CPUs (again, more as a "they're inexpensive now, so get > as much as we can afford" than any real need for it). > > One of them has dedupe enabled (yeah, yeah, we know, we're moving away from > it, it's actually the last one with it enabled), But what about all of the savings you were benefitting from? Wasn't it like 10x dedup savings or something, I know I've asked before at the forums but a person forgets... What's made you change your mind? /K (a.k.a Sebulon) > and actually does use the > RAM for DDT storage in the ARC. The other one doesn't have dedupe enable, > and most of the RAM sits "idle". > > -- > Freddie Cash > fjwcash@gmail.com > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
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