Date: Sun, 20 Nov 2011 23:26:37 -0500 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: APseudoUtopia <apseudoutopia@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Setting up ZFS - Filesystem Properties and Installing on Root Message-ID: <CAOgwaMu4KR3Dpc4ZUSZbxzpS06oe5Bgv-MvzMA6ELiB49%2BJqCg@mail.gmail.com> In-Reply-To: <CAKOHg=PEqeMPN_2dfQ%2B4msi1j7CMUu=iO%2BpSuezRoa_CELzQtw@mail.gmail.com> References: <CAKOHg=PEqeMPN_2dfQ%2B4msi1j7CMUu=iO%2BpSuezRoa_CELzQtw@mail.gmail.com>
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On Sun, Nov 20, 2011 at 10:34 PM, APseudoUtopia <apseudoutopia@gmail.com>wrote: > Hello, > > I'll be setting up a server with ZFS on 9.0-RELEASE (when it's > released...). I've never used ZFS before, and although I've been > reading quite a bit about it, I have some questions. > > My plan is to use RAID-Z1 across 4 disks. I'll be using GPT, and I > would like the root to be ZFS as well. I found a guide: > http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/RAIDZ1 > > In step #4, it has you create boot, swap, and zfs partitions on all 3 > (which would be 4 in my case) disks. Then, in step #5, you install the > bootloader into all 3 (4) drives. Why do you need boot and swap > partitions on EACH disk? It seems to me that you would only need disk > 1 to have boot, swap, and zfs, and the other 3 disks only have one > partition (using the entire drive) for zfs's pool. Does it have to do > with the RAIDZ1 setup? Even then, I don't understand it because it's > not disk mirroring, it's RAID. The BIOS is set to look on one specific > disk for the loader, not all of them. It seems I'm not understanding > something entirely here. > http://en.wikipedia.org/wiki/RAID http://en.wikipedia.org/wiki/Category:RAID If disk 1 fails , the computer ( BIOS ) will look disk 2 . If disk 2 fails , the computer ( BIOS ) will look disk 3 . If disk ( n - 1 ) fails , the computer ( BIOS ) will look disk ( n ) . > > Also, with ZFS, you can have an unlimited number of filesystems, > correct? I've been trying to figure out the best way to create these > filesystems with the appropriate flags (specifically: atime, > compression, devices, exec, quota, readonly, and setuid). If, for > example, I set devices=off and suid=off on the tank/var filesystem, it > is applied to the children filesystem, such as, /var/log, /var/db, and > so on? The flags/properties can be changed on-the-fly, correct? If, > for example, I set a filesystem noexec, but later realize I need exec, > I can change it without issue? > > Does anyone with zfs experience have any tips on creating a filesystem > layout, in terms of which filesystems to create and what > flags/properties? Would it be bad to set noatime, nosuid, nodev, and > noexec all on the tank, then allow each property appropriately for > each directory as necessary? As in, set the whole tank noexec, but > allow exec for /bin, /usr/home, /usr/local/bin, etc.? > > Thank you all very much! > _______________________________________________ > Thank you very much . Mehmet Erol Sanliturk
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