Re: Defrag SBS Drives ?
- From: "User" <User@xxxxxxxx>
- Date: Fri, 17 Feb 2006 15:22:34 -0800
We had attempted to run a defrag last weekend and it sat at 3% for 12
hours-until we stopped it. You could see the files being processed (down on
the status bar). With raid 5 'at' 250gb each drive (5 hard drives) with
hot spare (the 6th drive).
Does this seem out of line?
"Gabriel C. Stan" <GabrielCStan@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:3A07E7AA-57C0-4718-8ABD-89BC945F449F@xxxxxxxxxxxxxxxx
At 1Tb it will take 3-4 hrs depending on your hd troughput.
In my opinion leave them alone your hds are working hard already no need
to
stress them, if you feel the need to do some benchmarking try HD Tach and
see
how they messure up.
As per how data gets stored on the RAID it is up to the raid controller so
moving data around just for the sake of getting a proper defrag report it
is
not worth it.
"User" wrote:
Gabriel,
So running defrag won't help?
Our fragmentation is at 9%, with files fragmentation at 18%.
If it would be beneficial and we do run defrag how long should it take to
defrag 750gb (1 tb total space) of data with files sizes between 50 and
100
megabytes.
Thank you,
Kevin
"Gabriel C. Stan" <GabrielCStan@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message
news:E60532D6-D147-483E-AC04-6E4A0AE04A58@xxxxxxxxxxxxxxxx
I think that someone is missing the point here!
You are running a RAID 5 on top of DELL hardware CERC (Adaptec OEM).
The OS has no saying where the data is stored the only data that is
fixed
on
disk is MFT since the raid puts them at the beginning for RAID recovery
purpose, the rest is up to the controller.
If you really want to feel worm and fuzzy inside you can try Diskeeper
10
Enterprise this will defrag even if you are running VSS, but in reality
it
will not improve your disk benchmark.
Even the idea of multiple partitions on a RAID 5 is outdated since if
you
have a hardware failure you loose all partitions and if you lose a
partition
and you have to recover it is the same process as restoring few data
folders.
What you get is no more: my system partition is too full how can I
change
its
size!
If you think of how HDs work you get the most throughput at the
beginning
of
the HD, that will be the outer edge of the physical disk, if your HDs,
are
80
Gb and you allocate 40Gb for System Partition but all of your real data
is
on
the Data Partition which starts on the second half of the disk. So in
the
middle of the disk your throughput is significant slower because of the
surface speed of the HD, think of a vinyl disk.
Unfortunately I had the opportunity to recover sever RAID Arrays due to
hardware failure and when you get on the disk surface and you see how
the
data is actually stored you will think twice about partitions and
defrag.
The only way you get better performance is by increasing the throughput
and
decreasing the latency (access time), well the throughput is higher at
the
beginning of the disk and the latency is influenced mostly by the raid
controller, since it has to make its calculations. So if your put your
swap
files and vital OS (most used) and data files at the beginning of the
disk
you get better performance and the latency is controller based and disk
fragmentation is not a factor since on RAID you also have disk balance
(the
disk that is not too busy gets the call). The swap file is created
early
when
you build the system so it is at the start of the disk so is most of
the
OS
files the trick is to get the exchange files and the SQL databases to
stay
as
close to the beginning of the disk.
In am still running RAID based on IDE drives that have the feel of SATA
RAID
simply because it is not partitioned at all.
Hope you find it insightful, sorry if I am too abrupt, but one in 5
posts
here are disk related!
"User" wrote:
hello..
I'm thinking we should defrag our sbs 2k3 hard drives. Our C: and E:
The
C:\ drive has our Premium OS and most all other OS apps/data except
for
the
Exchange mdbdata is on the E:.
The C: (40GB) and E:(900GB) are both part of a raid 5 array (Dell Perc
Controller)
Any hints to running windows defrag? Should I dismount the exchange
store
first? Unplug the network cable? Stop services? Or just run defrag?
.
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