Storage Discussions http://forums.hds.com/index.php Tue, 09 Feb 2010 10:13:50 -0500 5 http://forums.hds.com/index.php?showtopic=1072
Using the same Jetstress config (number and size of databases) I'm seeing overall higher latency when running 'on' a DP pool of 3, 6+1's (striped 'down' the left side of 3 disk shelves) vs a single 7+1 (on one disk shelf).

config is single 4GB qlogic card using targets 0a and 1b (switched, targets at 4Gb) with HDLM (windows 2003, 32bit), disks are 300GB, SAS 15k.

I'm wondering if there's some CPU overhead on the controllers due to DP. Thanks...]]> Tue, 02 Feb 2010 16:54:56 -0500 1072 http://forums.hds.com/index.php?showtopic=1070 Can anyone help me with the following questions?

1. Can hosts be online and doing IO to the AMS2000 when the microcode is being upgraded

2. How is the disk drive code loaded? Is it separate code or is it all bundled with the main microcode package?

3. If hosts can be doing IO, how is the code loaded on the disk drives? Is the IO somehow quiesced within the storage array bus such that this can occur? I can't see how the drive code can be loaded if t is servicing IO simultaneously.

I have been looking around for the maintenance manual but it's been hard to find on their website.

Thanks for any feedback.]]> Tue, 12 Jan 2010 09:18:35 -0500 1070 http://forums.hds.com/index.php?showtopic=1068
Am I missing something somewhere? 100 DP-VOLs x 7 MINS!!!! That ain't fast, I'd rather just do CVS formats for 100 LDEVs.

Please someone enlighten me on this! Let's see if any HDS engineers come out of the wood works to address.]]> Sun, 10 Jan 2010 12:08:55 -0500 1068 http://forums.hds.com/index.php?showtopic=1069
I need a bit of help configuring Tuning manager agents.

We are installing Tuning Manager 6.2 and I have configured the server and install agent for SAN and RAID on the management server. I am now installing the agents and we have a SQL Server Cluster and an Exchange Cluster. Now as I understand it if we need continuity of stats we need to setup the agents to use a shared disk to store data and use logical hostname and not run a separate instance on the individual hosts.

Is it correct that the performance data is stored locally and not centrally on the server?
Which agents need to store data on a shared disk?
The doco only mentions SQL server agent but what about Agents for Windows, RAID Map and Exchange?
Do they need to be setup on shared storage as well?

Any help much appreciated.

Cheers

John

]]> Tue, 12 Jan 2010 04:20:24 -0500 1069 http://forums.hds.com/index.php?showtopic=1071
We have two modular arrays - their controller IPs changed due to network subnet changes. These arrays' LUs are set in a lot of logical groups in HDvM (by tier + company structure for billing purpose). Now they can NOT be refreshed due to old IP addresses. When I opened "Modify Properties" - controller IPs can't be modified from here, and there is no simple text file to modify under C:\Program Files\HiCommand\DeviceManager to change their IP addresses.

If I remove them (then add them back with correct IPs), the LUs in Logical groups will be gone.

Is there a simple way to modify "IP Address 1" and "IP Address 2" in HDvM?

Has anyone been in this situation and what's the best way to fix it?

Thanks in advance.

Godfrey Zhang
CSC Australia]]> Wed, 13 Jan 2010 19:06:20 -0500 1071 http://forums.hds.com/index.php?showtopic=1015 I was wondering if anyone has got SNM2 working with HDvM for physical view. We have a number of AMS2x00 and would like to get SNM2 working on our HDvM server instead of installing locally on every machine we use.
Any help appreciated.]]> Tue, 07 Jul 2009 19:06:21 -0400 1015 http://forums.hds.com/index.php?showtopic=1066
I know i'm sounding stupid asking this question, but so frustrated not able to find info on AMS command-line guide. HDS really needs to get better with providing accurate and proper documentation guides.

auhgdef is the command i'm using to create hostgroup but doesnt give me the option to specify what OS platform to assign. also looked at auhgopt command which only enables to set additional options and not any platform modes.

Any help on this is greatly appreciated.

thanks
mrp]]> Tue, 08 Dec 2009 13:17:46 -0500 1066 http://forums.hds.com/index.php?showtopic=1067
we are using Solaris 10 + Veritas on some of our servers. After several internal benchmarks of USP VM we find two configurations the best suited from performance of view for Oracle OLTP workload:
1. (2D+2D)-veritas-stripe-(2D+2D) (Veritas stripe of two different RAID1 (2D+2D) )
2. (4D+4D)
The advantage of the second option is that to achieve requested performance we need less Veritas stripes that in the first option, e.g.:
1 x (4D+4D) ~ 2 x (2D+2D) (~ = comparable)
2 x (4D+4D) ~ 4 x (2D+2D)
etc.
Since performance of the above configurations are comparable (do you agree ?) we tend to use the second option because of less administrative overhead involved with configuration at Veritas level.
Do you agree with these approach ? Any hidden drawback of (4D+4D) ?


]]> Tue, 29 Dec 2009 17:12:51 -0500 1067 http://forums.hds.com/index.php?showtopic=1065
I've heard rumblings that HDS GSS recommends RAID6 for all RAID Groups with 450GB drives.

thanks
sr]]> Mon, 07 Dec 2009 12:51:36 -0500 1065 http://forums.hds.com/index.php?showtopic=495
I'm looking for the new lun by doing cat /proc/scsi/qla2xxx/1 and 2

I'm suspecting that this has something to do with a setting on the AMS500, which is set up exactly as specified in the user guide. I'm suspecting this has something to do with LUN protection or the undocumented Host Group Security option under Access Mode in the hitachi storage navigator

This is really annoying because the server I'm trying to get these luns to show up on has more than a dozen active database instances, and I really don't feel like rebooting it and bringing down all services every time I need to add a lun

Any help greatly appreciated]]> Fri, 16 Mar 2007 11:26:01 -0400 495