Date: Thu, 09 Feb 2012 14:47:14 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: fjwcash@gmail.com, emz@norma.perm.ru Cc: freebsd-stable@freebsd.org Subject: Re: zfs arc and amount of wired memory Message-ID: <pwp7s09b83445fxedhr7v7vn.1328794891854@email.android.com>
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Hi, this only applies to old systems (slooow disks, no NCQ support), or very fast USB3 memory sticks. Current (I would say at least 2-3 year old) hardware is slowed down by USB2. Bye, Alexander. -- Send via an Android device, please forgive brevity and typographic and spelling errors. Freddie Cash <fjwcash@gmail.com> hat geschrieben:On Wed, Feb 8, 2012 at 10:40 AM, Freddie Cash <fjwcash@gmail.com> wrote: > On Wed, Feb 8, 2012 at 10:25 AM, Eugene M. Zheganin <emz@norma.perm.ru> wrote: >> On 08.02.2012 18:15, Alexander Leidinger wrote: >>> I can't remember to have seen any mention of SWAP on ZFS being safe >>> now. So if nobody can provide a reference to a place which tells that >>> the problems with SWAP on ZFS are fixed: >>> 1. do not use SWAP on ZFS >>> 2. see 1. >>> 3. check if you see the same problem without SWAP on ZFS (btw. see 1.) >>> >> So, if a swap have to be used, and, it has to be backed up with something >> like gmirror so it won't come down with one of the disks, there's no need to >> use zfs for system. >> >> This makes zfs only useful in cases where you need to store something on a >> couple+ of terabytes, still having OS on ufs. Occam's razor and so on. > > Or, you plug a USB stick into the back (or even inside the case as a > lot of mobos have internal USB connectors now) and use that for swap. That also works well for adding L2ARC (cache) to the ZFS pool as well. -- Freddie Cash fjwcash@gmail.com _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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