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Old 9th December 2009
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Default root on ZFS

Hi everyone,

I have been experimenting lately with ZFS boot on FreeBSD. I have performed different kind of methods and I've reached to the conclusion that using the "vfs.root.mountfrom" method instead of traditional fstab mounts is more flexible. However, when I try to perform an installation using this guide my system boots and doesn't mount /usr /var /tmp patitions

I can only boot to single user mode with readonly ZFS /

I suspect that it has something to do with:
Code:
'vfs.root.mountfrom="zfs:zroot"'
maybe it should be ?
Code:
'vfs.root.mountfrom="zfs:zroot/root"'
From the Fixit environment I can see all the mount points

Please some help!!!
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Old 10th December 2009
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Anyone ?
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Old 11th December 2009
J65nko J65nko is offline
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I don't have the hardware to run ZFS, my fastest machines are a P4 2.0Ghz with only 512MB and an ADM64 with 1 GB of memory, which is not enough to use ZFS.

I installed DragonFlyBSD this summer, and used it's Hammer filesystem, but I haven't been able to really play with it thoroughly
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Old 11th December 2009
DNAeon DNAeon is offline
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Quote:
Originally Posted by J65nko View Post
I don't have the hardware to run ZFS, my fastest machines are a P4 2.0Ghz with only 512MB and an ADM64 with 1 GB of memory, which is not enough to use ZFS.

I installed DragonFlyBSD this summer, and used it's Hammer filesystem, but I haven't been able to really play with it thoroughly
Why not enough for ZFS? I see the Handbook says that with 1g of memory is good to go with.

What do you think are the minimum requirements for ZFS, anyway, I mean for a good performance - is it the memory that is playing the bigger role or the CPU?
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Old 12th December 2009
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Solved! Answer can be found here
@DNAeon
Memory is the number one factor and a 64bit cpu.
Imagine that in my Opensolaris box out of 4G only 512 are free and the system is just sitting. Of course opensolaris kernel is known to be a memory eater but still most of the memory is consumed by the file system. Also, for truly reliable results ECC memory is recommended.

FreeBSD 8.0 release running on Vmware Server:
Code:
> zfs list
NAME                        USED  AVAIL  REFER  MOUNTPOINT
zroot                      2.08G  9.67G   269M  legacy
zroot/swap                    1G  10.7G    16K  -
zroot/tmp                    23K  9.67G    23K  /tmp
zroot/usr                   825M  9.67G   341M  /usr
zroot/usr/home               27K  9.67G    27K  /usr/home
zroot/usr/ports             188M  9.67G   188M  /usr/ports
zroot/usr/ports/distfiles    18K  9.67G    18K  /usr/ports/distfiles
zroot/usr/ports/packages     18K  9.67G    18K  /usr/ports/packages
zroot/usr/src               297M  9.67G   297M  /usr/src
zroot/var                  9.64M  9.67G   108K  /var
zroot/var/crash            18.5K  9.67G  18.5K  /var/crash
zroot/var/db               9.35M  9.67G  9.33M  /var/db
zroot/var/db/pkg             18K  9.67G    18K  /var/db/pkg
zroot/var/empty              18K  9.67G    18K  /var/empty
zroot/var/log                52K  9.67G    52K  /var/log
zroot/var/mail               18K  9.67G    18K  /var/mail
zroot/var/run                60K  9.67G    60K  /var/run
zroot/var/tmp                19K  9.67G    19K  /var/tmp
Code:
> zpool status zroot
  pool: zroot
 state: ONLINE
 scrub: none requested
config:

	NAME           STATE     READ WRITE CKSUM
	zroot          ONLINE       0     0     0
	  mirror       ONLINE       0     0     0
	    gpt/disk0  ONLINE       0     0     0
	    gpt/disk3  ONLINE       0     0     0

errors: No known data errors
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Old 14th December 2009
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Quote:
Originally Posted by DNAeon View Post
Why not enough for ZFS? I see the Handbook says that with 1g of memory is good to go with.

What do you think are the minimum requirements for ZFS, anyway, I mean for a good performance - is it the memory that is playing the bigger role or the CPU?
2G+ of memory plus AMD64 is the optimal configuration. Below that it is trial & error.
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Old 15th December 2009
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Quote:
Originally Posted by Oliver_H View Post
2G+ of memory plus AMD64 is the optimal configuration. Below that it is trial & error.
Correct!
Imagine that my fileserver now runs 8.0 Release AMD64 with 4G Ecc Ram. I use ZFS mirror for root 2X240GB and Raidz1 3X640GB for storage in different controllers . During a 100GB transfer from one Raid to the other the system was left with 256M free Ram.

George
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Old 15th December 2009
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Free memory means little with the FreeBSD memory manager. You'd have that much free memory after such a transfer with any filesystem, UFS or ZFS or any other. And the same goes for a 10GB *read* operation too.
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Old 15th December 2009
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Quote:
Originally Posted by Beastie View Post
Free memory means little with the FreeBSD memory manager. You'd have that much free memory after such a transfer with any filesystem, UFS or ZFS or any other. And the same goes for a 10GB *read* operation too.
Hadn't noticed that with UFS although I was using that before. As a matter of fact this server was running with 512MB on FreeBSD 6.3 in a gmirror setup.

George
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Old 15th December 2009
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See http://lists.freebsd.org/pipermail/f...er/053156.html for a discussion on ZFS on root, useful links and tips
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Old 16th December 2009
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Quote:
Originally Posted by Beastie View Post
Free memory means little with the FreeBSD memory manager. You'd have that much free memory after such a transfer with any filesystem, UFS or ZFS or any other. And the same goes for a 10GB *read* operation too.
True but ZFS is a known ressource-hog.
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Old 16th December 2009
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Only if you let it be. You can limit the amount of RAM that ZFS uses.

Obviously, the more RAM you let it have, the better results you'll get.
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Old 18th December 2009
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>the more RAM you let it have

The less RAM the easier you get some crash.
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