Lorenzo Perone lopez.on.the.lists at yellowspace.net
Fri Oct 31 05:45:56 PDT 2008

Thanx a lot for sharing :)

OK guys that sort of gives some courage to dare a next experiment.
I've got one host which has one AMP application and a mailserver
running, which I'd like to set up with live zfs goodness (I know that
customer would kiss me for having a snapshot history of the mail
accounts...), and your posts give me the spark to try this one out.
It's nothing high-volume, so summing up Freddies and Your post
makes me hope this one won't deadlock too soon.

anyway It's a DELL PE 1950 wirth enough ram and, most of all, a
DRAC so I can powercycle that one remotely if it does the dance :->

Hope to have good news to report after a few weeks of

Thanx a lot and regards...


On 31.10.2008, at 03:15, Louis Kowolowski wrote:

> 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
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