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тАО12-19-2011 08:35 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
тАО12-19-2011 08:35 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
common questions-Storage architecture
I am new to Storage architecture.I have some doubts reagardng storages in common ie not specific to HP storage.
1) In which scenario the raid-1 is best suited and in which scenario raid-5 is best suited.
2) Is there any performance difference can be achieved if I am using smaller size of LUNs ie if OS team require 500GB of space for their Fiesyatem, which will be the best option - to create a single 500GB or to create 50/100GB LUNs. And please let me know the reason for the same.
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тАО12-19-2011 09:58 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
тАО12-19-2011 09:58 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
Re: common questions-Storage architecture
It all depends on the hardware used, but in general a RAID10 is faster than a RAID50, because there is no calculation needed; an array can do striping better/faster than the OS can do (better use a large LUN). But it depends on the array hardware ...
Hope this helps!
Regards
Torsten.
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тАО12-19-2011 10:17 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
тАО12-19-2011 10:17 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
Re: common questions-Storage architecture
I am using HP-EVA8K and EVA6K. We are defining raid1 and raid5 usually. AMong this which is better?
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тАО12-19-2011 10:21 PM
тАО12-19-2011 10:21 PM
Re: common questions
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО12-19-2011 11:00 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
тАО12-19-2011 11:00 PM - last edited on тАО12-22-2011 02:03 AM by RASHMI
Re: common questions-Storage architecture
1) In which scenario the raid-1 is best suited and in which scenario raid-5 is best suited.
RAID1 when you want fast writes and more reliable storage.
RAID5 when you want slower writes and cheap storage.
http://en.wikipedia.org/wiki/RAID#RAID_10_versus_RAID_5_in_Relational_Databases
The wikipedia entry has some nice information.
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тАО12-21-2011 11:02 PM - last edited on тАО12-22-2011 02:04 AM by RASHMI
тАО12-21-2011 11:02 PM - last edited on тАО12-22-2011 02:04 AM by RASHMI
Re: common questions-Storage architecture
Go to acnc.com
it will answer all your queries.
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тАО12-22-2011 09:49 AM
тАО12-22-2011 09:49 AM
Re: common questions-Storage architecture
As far as LUN size, older OS'es were sometimes limited in the number of IOs they could queue to a single LUN. To improve performance, one gave them several smaller LUNs. As far as I know, no operating system worth its salt these days has such a problem. In addition, since physical drives used to be small, one would present several to the OS which would bundle them together into a large logical volume; usually done by the OS's LVM (Logical Volume Manager).
These days, most operating systems have the ability to have many IOs going to its LUNs. Also, AFAIK, all newer file systems have the ability to deal with an expanding LUN. So there should be little or no difference in performance between one 500GB LUN vs. ten 50GB LUNs. And management will definitely be Much Easier.
It might help if you told us what Operating System (and version) and what applications (and version) you are planning on using.
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company