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12-26-2005 03:50 AM
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12-26-2005 05:05 AMSolution
Typically you want to boot off the SmartStart CD that come with the server, and run the Array Configuration Utility. The ACU will allow you to create the array and logical driver. You could create Array A with your os logical drive and Array B with your data logical drive. Depending on the number of driver you have, you can have a separate spare for array of one spare HDD for both arrays.
12-26-2005 05:20 AM
You don't need a 1+0 for the operating system, you can use a RAID 1 only.
A spare is always good idea.
For data, if you want maximum availability and performance, choose 0+1, but at the highest cost.
If you want a balance between performance and availability, choose RAID 5.
For the OS RAID, you must do the configuration from smart start (ACU). After the OS installation, you can run ACU from the smart start or the operating system.
You can use the SmartArray tool only if you have a hardware RAID. You should have one.
12-26-2005 08:11 PM
This is really quite an open ended question. RAID is a trade off between cost, fault tolerance and performance. It depends what you are intending to use the server for. There are loads of white papers but if you have a look at this one you will find it contains most of what you need to know (and lots more than you need). http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00502620/c00502620.pdf
In a nut shell:
RAID 0 gives the best performance and is the most cost effective but gives you no fault tolerance
RAID 1 gives the best performance with fault tolerance but is the highest cost (except RAID 1+0 which is way OTT for most installations)
RAID 5 is normally the best compromise for most installations.
You will often need to mix the RAID levels on installation to get the best performance. This is often the case with anything to do with databases such as SQL-Server or Exchange. where you may have two RAID 0 sets and one RAID 5.
A good generic link is http://h18004.www1.hp.com/products/servers/technology/whitepapers/index.html Have a read and if you have more specific questions then post then back.
12-26-2005 08:16 PM
12-26-2005 08:19 PM
12-26-2005 10:38 PM
1. " It's been suggested that we do a RAID 1+0 for the OS, and 5 for data, using a spare for each. It's on a DL380/4. Any suggestions"
You can use the smartarray CD of hardware RAID Controller, which was supplied with your server for configuring the server.
If your controller is having more than one channel, then it is recommended to put both array on seperate channels, otherwise will cause a very big performance bottleneck for your operating system as you are configuring O S as RAID 1 & the data part as RAID5 ( RAID 5 will consume your RAID processor and memory resources for the parity generation)
It's not must to spare individual hotspare disks for both arrays, you can have a single global hotspare for both the array. As soon as 1 disk on either array fail, global hot spare will do an auto include & start rebuilding ( incase of RAID5) or copy ( incase of a RAID 1).
But you should have the higher capacity disk to be used as global hot spare ( eg. if your OS - RAID1 is having 2* 36 Gb & DATA -RAID5 is having 5* 146GB, then you have to use a 146GB as global hotspare.
2. "Is it done via the SmartArray tool, or the OS?"
You should create the RAID1 volume before installing the operating system. You can configure the RAID5 before or after installation of O S.
I hope this will help you..
12-26-2005 10:44 PM
If you are not purchased the array controller, then buy one which is having atleast 2 channels & 128MB cache ( with battery backup if possible, so that we can configure write back policy for RAID5, which will greatly boost system performance-by generating & writing the parity later).
RAID1 + RAID5 through software ( O S feature without hardware) is not recommended, as it will consume your CPU & memory just for disk I/O activities and your actual server application will not get the resources.
12-26-2005 11:27 PM
The DL380G4 only has capacity for six drives so if you do go to a dual configuration, you will only be able to configure the RAID 5 array with an on line spare.
IMO you should be monitoring the system and with only three drives in the array, the chance of two drives failing are fairly remote. The on line spare is of more use if you have a large number of disks in your array, in which case you are more likely to use ADG (RAID 6).