Mark Stapper wrote:
Miroslav Lachman wrote:
[...]
Yes, I am using it this way:
r...@cage ~/# gmirror status
Name Status Components
mirror/gms1 COMPLETE ad4s1
ad6s1
r...@cage ~/# zpool status
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror ONLINE 0 0 0
ad4s2 ONLINE 0 0 0
ad6s2 ONLINE 0 0 0
errors: No known data errors
r...@cage ~/# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
tank 444G 353G 91.2G 79% ONLINE -
gmirror gms1 is for system files, ports etc. zpool (444GB) is for jails
Miroslav Lachman
_______________________________________________
Hello,
I'm quite surprised by your setup, as you are using two mechanisms to
accomplish the exact same thing: data replication.
If you want two slices of toast do you use a toaster for one, and an
oven for the other?
My advice to you: either use zfs or gmirror to realize redundancy.
Of course, zfs provides far more flexibility then UFS. However, as
mentioned, booting from ZFS isn't something sysinstall can setup for you.
Besides, updating a zfs filesystem which you are running from is next to
impossible. And since ZFS is still under heavy development, you will
want to update your zfs version every now and then.
So, i would recommend setting up gmirror to mirror your whole disks,
install the base system(boot and "world") on a small UFS slice, and use
the rest of the disc as zfs slice.
The reason is simple - the machine was installed one year ago, when ZFS
was more experimental and sometimes with unexpected results and kernel
panics. It was safer to use UFS for base. And the reason for using
gmirror for base (small slice) and not for whole drive is
re-synchronization after panic. Sync of 500GB drives in gmirror takes
about 2 hours or more if system is under load. Sync of ZFS mirror takes
seconds - only few files are synchronized, not whole mirror.
ZFS mirror is better to avoid "silent data corruption" on mirrored drives.
And because the setup with gmirror of one slice and ZFS mirror for
second slice works without problem, I see no reason to do any changes on
this machine.
If you feel comfortable enough running your entire system on zfs, you
could use a mirrored zpool to boot from. Takes a little more efford, but
is more uniform.
Updating zfs will be a pain though. You would have to boot from another
filesystem to be able to update your root filesystem.
If you'll be reinstalling your system, you might want to check out
FreeBSD 8 because zfs boot support is better.
Hope it helps.
Greetz,
Mark
I am able to install and run system from ZFS only, but I have no such
strong feeling to do it. I am using 2GB USB flashdisk with UFS to boot
and run a system, then 4x 1TB drives in RAIDZ used as storage pool on
backup server.
And again - ZFS is still experimental and this setup is better for me in
case when I need to do some recovery or ZFS upgrade. All can be done
remotelly without a need to boot some LiveCD etc.
It is my € 0.02, YMMV.
Miroslav Lachman
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