Mac Pro setup advice
churnd
Pro (2.8GHz dual Quad & 8GB RAM) that won't break the bank & offer
decent speed. Right now my top choice is a SANS DIGITAL TowerRAID
TR4MP: http://www.newegg.com/Product/Product.aspx?Item=N82E16816111136&cm_re=server_raid-_-16-111-136-_-Product
The primary thing I'm wondering is if this setup would perform well
with ZFS. What kind of performance could I expect with a raidz1 pool,
assuming zfs was configured optimally (no dedupe or compression, etc).
Or, if others have a better idea for an enclosure + expansion card
setup, I'd be glad to hear it.
Jason Belec
http://www.addonics.com/products/raid_system/mst4.asp
If you read carefully, they have a connector that handles individual disks right on the hardware (not JBOD - that is also an option). In many cases I just get the little cards, stick a lot of drives on a dedicated power supply and connect sata cables (5 per card). Then it's up to the card you have in your system. These are Silicon Image based.
You can build some pretty useful setups this way to meet your needs.
Jason
Sent from my iPad
Chris Ridd
On 18 Mar 2011, at 11:30, Jason Belec wrote:
> Don't know about that kit, but I use these (several so far for clients). I have had a lot of issues testing various boxes over the years, so I read carefully. ;)
>
> http://www.addonics.com/products/raid_system/mst4.asp
>
> If you read carefully, they have a connector that handles individual disks right on the hardware (not JBOD - that is also an option). In many cases I just get the little cards, stick a lot of drives on a dedicated power supply and connect sata cables (5 per card). Then it's up to the card you have in your system. These are Silicon Image based.
>
> You can build some pretty useful setups this way to meet your needs.
What are those like, noise- and performance-wise? I'm currently intrigued by these <http://www.integral-storage.com/product/4-bay-multi-drive-storage-enclosure> (4 x 2.5" eSATA JBOD) which I've also seen rebadged.
Chris
Jason Belec
Do take some care with JBOD, I had serious issues with some enclosures I tested. When I came across boxes with boards that also offered 'individual disk' I was in heaven. I don't utilize JBOD.
--
Jason Belec
Sent from my iPhone
Dan Bethe
On Mar 18, 4:31 pm, Jason Belec <jasonbe...@rogers.com> wrote:
> Do take some care with JBOD, I had serious issues with some enclosures I tested. When I came across boxes with boards that also offered 'individual disk' I was in heaven. I don't utilize JBOD.
disk"? I thought that's what "JBOD" meant. What is "JBOD" if not
giving access to individual disks?
X Bytor
>
> Hi there Jason. Can you clarify what you mean, regarding "individual
> disk"? I thought that's what "JBOD" meant. What is "JBOD" if not
> giving access to individual disks?
JBOD makes all of the disks in the enclosure look like one single
really big disk instead of providing access to the disks individually.
If one disk fails in a JBOD, you're screwed.
Anybody know of a good usage for JBOD?
-X
Mike Heller
The problem is these terms are used subjectively by the industry. That said, JBOD is the presentation of discrete disks and "span" is the presentation of a concatenated set. Raid 0 is an interleaved stripe set.
X Bytor
> JBOD can mean two different things. Look at the wikipedia article.
>
> http://en.wikipedia.org/wiki/Non-RAID_drive_architectures#JBOD
>
> I always knew it as disks that appear to the system as individual
> disks not as a big span of them.
>
And I had always only seen them as a concatenation into a large virtual disk.
I learned my one fact for the day...
Alex Blewitt
A big span of disks is RAID-0.
Alex
Daniel Bethe
> My understanding corresponds to Silas's. A JBOD of 10 disks exposes 10 devices
>to the OS. There's no concatenation/spanning/monkeying with them by the
>hardware; ZFS gets to see them all :-)
Yeah, which is the only way that there is any meaning whatsoever to the phrase
"just a bunch of drives".
Mike Heller
A span is a concatenation
Fill disk 1, then 2, then 3.
Raid zero is an interleaved set with a stripe depth in kilobytes.
Chris Ridd
On 22 Mar 2011, at 16:03, Silas Baronda wrote:
> JBOD can mean two different things. Look at the wikipedia article.
>
> http://en.wikipedia.org/wiki/Non-RAID_drive_architectures#JBOD
>
> I always knew it as disks that appear to the system as individual
> disks not as a big span of them.
Sorry, I meant to comment on Jason's post earlier.
My understanding corresponds to Silas's. A JBOD of 10 disks exposes 10 devices to the OS. There's no concatenation/spanning/monkeying with them by the hardware; ZFS gets to see them all :-)
Chris
Silas Baronda
http://en.wikipedia.org/wiki/Non-RAID_drive_architectures#JBOD
I always knew it as disks that appear to the system as individual
disks not as a big span of them.
—Silas
Daniel Bethe
invitation and inquiry that you emailed him? I'm just curious!
Alex Blewitt
> Hey there Alex. So did Don ever reply to you off the list, regarding that
> invitation and inquiry that you emailed him? I'm just curious!
No, I haven't heard from him other than that initial contact months ago. There was a suggestion he'd spoken to Jason via the IRC channels and his tweets, but nothing direct.
Alex