[clug-talk] WD Green HDD's with ZFS
osgnuru at gmail.com
Tue Mar 27 06:16:38 PDT 2012
Okay I am looking at XFS. Two draw backs that need to be worked around. XFS
can grow but cannot shrink, not a big deal as long as I leave one SATA port
unused for a future drive to swap out an old one. The other draw back is
that to run xfs_check (XFS version of fsck) you need A SHIT LOAD OF RAM or
a very, very big swap file/partition. It looks like for every 2TB of
storage you need 20GB of swap and a day or two to run xfs_check.
I am going to try XFS. It still sounds like a good thing.
On Mon, Mar 26, 2012 at 2:26 PM, Cody Swanson <mailinglists at sysop.ca> wrote:
> I have used ZFS extensively at home and at work for the last 5 years. My
> advice is don't use ZFS on linux.
> The fuse port is slow and you don't get some of the native OS features of
> ZFS. I also can't speak to it's reliability. There is also a kernel module
> built by 3rd party developers which works but is unreliable (
> www.zfsonlinux.org). I tried it recently and it worked great for about 3
> weeks at which time it started causing kernel panics on CentOS 6.2. I was
> also unable to mount the filesystem as it was stuck trying to do something
> with the ZIL. In short, ZFS with linux is a bad idea.
> If you want ZFS I suggest Solaris proper or FreeBSD. I have about 35TB of
> deduped data on a FreeBSD ZFS filer @work on generic hardware which is used
> for backups.
> I've also been running with a bunch of WD caviar greens at home on my
> personal media server for 3 years with ZFS on FreeBSD. The only problem I
> ran into was I had to run a utility to stop the drives from parking the
> drive heads when idle. I had a disk failure and when I pulled the smart
> data for my drives I noticed that the load-cycle count was over half a
> million for the drives even though they were only a few months old. I guess
> the WD firmware by default parks the heads when the disk is idle for more
> than a few seconds, when ZFS goes to flush the ZIL to disk it causes the
> heads to unpark. Once I ran the little WD dos util to disable that
> "feature" it fixed the issue and it may not be an issue on newer WD Greens.
> If you must use Linux I suggest XFS instead of ZFS. I've used XFS on linux
> for a long time and it's been quite reliable. My previous employer has many
> tens of petabytes of storage on Linux/XFS without issue.
> On 26/03/2012 12:08 PM, Shawn wrote:
>> Correct me if I'm wrong, but I don't believe FUSE is a viable option in
>> multi-user settings. I was looking at using sshfs to provide a network
>> share until I read that Fuse does not support file locking properly and
>> therefore could encounter problems when a file is being written to from
>> multiple sources (like say, two network users). Of course, I don't have
>> the web page handy where I found this either... sorry. The same document
>> recommended using CIFS or NFS instead. That may be old info though, so
>> do your homework regarding FUSE if you are looking at it.
>> On 12-03-26 11:50 AM, Gustin Johnson wrote:
>>> I do not consider FUSE or relying on a Ubuntu PPA to be a solution. The
>>> performance penalty you pay with FUSE pretty much negates any advantage
>>> any file system may have (except of course sshfs and other slow WAN FUSE
>>> based file systems). The third option of building it myself is no
>>> longer viable.
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