I'm looking into moving a workstation from Ubuntu 10 to FreeBSD 7.1
(both amd64) and I'm a bit worried about storage -- specifically
moving from mdadm, which performs very well for me.
Current in Linux I use an mdadm RAID5 of 5 disks. After investigating
FreeBSD storage options, RAID-Z sounds
I don't really have a whole lot of experience with RAID, so I was
wondering if the performance figures I'm seeing are normal or if I
just need to tweak things a bit. Based on what I've been reading, I
would expect more significant improvements over a single drive.
Here's my setup:
*
Milo
if you hunt around you should see papers/articles where it shows foe RAID 5
you need at least 5 drives before you any dramatic performance gains..(sun
old Sun articles from around 1998 where they do the math as well).
not sure about RAID 10, but again I *think* you need at least 3 drives
On Jan 25, 2007, at 10:50 AM, Milo Hyson wrote:
The write times of both RAID configurations are slower than the
single drive (which is expected due to having to write to multiple
drives). However, I wasn't expecting such a drastic reduction
(about 50%). The read times, although faster, are
On Jan 25, 2007, at 12:15, Chuck Swiger wrote:
Still, you also ought to consider that a 3-disk RAID-5
configuration is very much not ideal from either an efficiency or
performance standpoint-- you want more like 5 or 6 drives being
used, in which case your performance numbers ought to
How about one large raid, and two partitions to serve each purpose?
Being so limited in HW, youre either going to take a _huge_
performance hit with only 2 disks per raid (unless Raid0), or an
availability hit with everything on one RAID set.
But..considering the costs of adding RAID to a
On Jan 25, 2007, at 13:50, Jeff Mohler wrote:
How about one large raid, and two partitions to serve each purpose?
Being so limited in HW, youre either going to take a _huge_
performance hit with only 2 disks per raid (unless Raid0), or an
availability hit with everything on one RAID set.
Milo Hyson wrote:
I also ran some performance tests with a stock build of PostgreSQL 8.0
to get a different angle on things. Two tests were run on each of the
UDMA system drive, the RAID 5 unit, and the RAID 10 unit. The first
tested sequential-scans through a 58,000+ record table. The second
A quick call to 3ware and they told me to increase vfs.read_max from
8 to 256. That helped. I'm now seeing 4x performance on a four-drive
array vs a single drive. Additionally, Ivan was right about the
database being too small. iostat showed no disk activity after the
initial run, as
On Nov 29, 2006, at 6:18 PM, Derrick MacPherson wrote:
We updated to 6.1 this weekend and added 3 300gb drives to the
external raid cabinet, they were to go on a seprate controller but
the server happens to have a few other boxes on top making it
impossible at that time, so we put the 3x300
-questions@freebsd.org
Sent: 11/30/06 10:39
Subject: Re: degraded RAID performance after OS upgrade, and drives added.
On Nov 29, 2006, at 6:18 PM, Derrick MacPherson wrote:
We updated to 6.1 this weekend and added 3 300gb drives to the
external raid cabinet, they were to go on a seprate
On Nov 30, 2006, at 11:40 AM, Derrick MacPherson wrote:
That seems like a pretty crazy drop in performance, more than one
would expect. The machine is busy but not busy enough to warrant
this.. Imo.. Is there a way to test to confirm?
Using dd is a trivial benchmark, and not especially
We updated to 6.1 this weekend and added 3 300gb drives to the
external raid cabinet, they were to go on a seprate controller but
the server happens to have a few other boxes on top making it
impossible at that time, so we put the 3x300 (RAID5) , upgraded the
OS and performance is very
Hello,
I have installed FreeBSD-4.10 to NEC Express5800 120R.
I attached LSI Logic MegaRAID SATA 150-6 with six SATA disks.
And configure RAID 5 LUN.
But, I/O prformance is poor(about 5MB/s).
Is amr suitable for MegaRAID SATA 150-6 ?
Please tell me newfs parameters if there is recommendation.
Yui Sakazume wrote:
Hello,
I have installed FreeBSD-4.10 to NEC Express5800 120R.
I attached LSI Logic MegaRAID SATA 150-6 with six SATA disks.
And configure RAID 5 LUN.
But, I/O prformance is poor(about 5MB/s).
Is amr suitable for MegaRAID SATA 150-6 ?
Please tell me newfs parameters if there is
Has anyone got more than about 5MB/sec out of a Mylex DAC960PD?
I have two striped 7200RPM 68-pin wide ultra drives on a channel
(each channel supposed to handle 40MB/sec)
Having one drive on each channel made no difference.
Running the following command resulted in 5MB/sec maximum throughput
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