Date: Thu, 24 Nov 2011 14:19:19 -0500 From: APseudoUtopia <apseudoutopia@gmail.com> To: Matthew Seaman <m.seaman@infracaninophile.co.uk> Cc: freebsd-questions@freebsd.org Subject: Re: Setting up ZFS - Filesystem Properties and Installing on Root Message-ID: <CAKOHg=PWcpqHdyvaS%2BoRwghA5m-A-rMxF-wqw3ZAPERzmO%2BpRw@mail.gmail.com> In-Reply-To: <4ECB580E.20203@infracaninophile.co.uk> References: <CAKOHg=PEqeMPN_2dfQ%2B4msi1j7CMUu=iO%2BpSuezRoa_CELzQtw@mail.gmail.com> <88f3d8e819b3420f8e61723bee90ba5e.squirrel@www.magehandbook.com> <CAKOHg=N4yt0vdac8aZMUTK%2B8EnoSwxhK%2ByWmy7MsOXvKrWEmyw@mail.gmail.com> <4ECB580E.20203@infracaninophile.co.uk>
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On Tue, Nov 22, 2011 at 3:06 AM, Matthew Seaman <m.seaman@infracaninophile.co.uk> wrote: > On 22/11/2011 02:09, APseudoUtopia wrote: >> Another quick question about swap: If I have 4 drives, with 512MB >> swap, the system uses all 4 swap partitions, correct? So it's not like >> it'd be going to waste? I'd have a total of 2 GB swap? > > Well, yes. =C2=A0If you just declare those raw partitions to be swap area= s, > that will be the case. =C2=A0However, doing this is asking for trouble: y= ou > subvert any resilience features obtained by using ZFS with raidz1. =C2=A0= If > any one of the drives fails, your swap area will break and your system > will probably crash. > > Better to set up two pairs of gmirrors for swap -- the procedure is > described here: http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror > in section3 "Finish Install." =C2=A0This will effectively give you a raid= 10 > for your swap, with a total size of 1GB. > I'm not sure I understand this. How would that negatively affect the raidz1? The swap isn't in the zpool. I understand the system may crash if the OS was using the swap space and the drive failed. But would you not be able to reboot into a degraded zpool state and still have a usable system?
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