ZFS

[Louis Kowolowski]

On Oct 30, 2008, at 2:55 PM, Lorenzo Perone wrote:
> On 22.10.2008, at 17:38, Freddie Cash wrote:
>> Personally, we use it in production for a remote backup box using  
>> ZFS and
>> Rsync (64-bit FreeBSD 7-Stable from August, 2x dual-core Opteron  
>> 2200s, 8
>> GB DDR2 RAM, 24x 500 GB SATA disks attached to two 3Ware 9650/9550
>> controllers as single-disks).  Works beautifully, backing up 80  
>> FreeBSD
>> and Debian Linux servers every night, creating snapshots with each  
>> run.
>> Restoring files from an arbitrary day is as simple as navigating to  
>> the
>> needed .zfs/snapshot/<snapname>/<path>/ and scping the file to  
>> wherever.
>> And full system restores are as simple as "boot livecd, partition/ 
>> format
>> disks, run rsync".
>
>
> So your system doesn't suffer panics and/or deadlocks, or you just
> cope with them as "collateral damage" (which, admitted, is less of
> a problem with a logging fs)?
>
> If that's the case, would you share the details about what you're  
> using
> on that machine (RELENG_7?, 7_0? HEAD?) and which patches
> /knobs You used? I have a similar setup on a host which
> backs up way fewer machines and locks up every... 3-9 weeks or so.
> That host only has about 2GB ram though.
>
I have a system which is sort of similar in production at work.
I have the following tunables (for ZFS) set:
zfs_load="YES"
vm.kmem_size_max="1024M"
vm.kmem_size="1024M"
vfs.zfs.arc_min="16M"
vfs.zfs.arc_max="384M"

[lkowolowski at release lkowolowski 76 ]$ uname -a
FreeBSD release.pgp.com 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #0: Wed  
Sep  3 12:18:57 PDT 2008     root at release.pgp.com:/usr/obj/usr/src/sys/ 
GENERIC  amd64
[lkowolowski at release lkowolowski 77 ]$

This box has 2G of RAM, and 8.5T in ZFS spread across 8 RAID1 mirrors  
in an EonStore Fiber array (direct attach).

It's been rock solid and stores all of our build collateral.

--
Louis Kowolowski                                louisk at cryptomonkeys.com
Cryptomonkeys:                      http://www.cryptomonkeys.com/~louisk

Making life more interesting for people since 1977