Date: Sun, 20 Nov 2011 22:34:08 -0500 From: APseudoUtopia <apseudoutopia@gmail.com> To: freebsd-questions@freebsd.org Subject: Setting up ZFS - Filesystem Properties and Installing on Root Message-ID: <CAKOHg=PEqeMPN_2dfQ%2B4msi1j7CMUu=iO%2BpSuezRoa_CELzQtw@mail.gmail.com>
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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. 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!
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