Constant disk activity on 2 node RAC 11g cluster - Can anyone help?
Hi Folks,
My first post on the forum so I hope you go easy with me.
I'm new to Oracle, and thought that the best way to get into it would be to dive in and build an experimental RAC cluster on my home network. To this end I used Jeff Hunter's "Build Your Own Oracle RAC Cluster on Oracle Enterprise Linux and iSCSI" guide.
My only departures from the guide is that I've modelled the architecture entirely within Vmware ESXi on a single quad core Opteron server (HP ML115 G5) with 8Gb RAM and a 1 Tb SATA hard disk. I've also used Openfiler 2.3 for the iSCSI storage rather than the deprecated 2.2. I therefore have 2 Virtual Machines running Oracle Enterprise Linux 5.1, and a 3rd VM running Openfiler 2.3. Each VM has a second virtual NIC connected to an isolated vswitch which functions as the RAC interconnect network.
I've completed the configuration of the cluster and all the checks (as per the article) report that everything is a-OK.
However I've noticed that there is a high rate of disk activity on my server, which continues constantly. I've left the server running overnight and the continuous disk activity is still there! :(
I also noticed yesterday that I could not stop the first instance using either the instance specifc srvctl stop instance -d orcl -i orcl1
or the global srvctl stop database -d orcl. In both cases the command appeared to hang. I had no problems stopping the second instance on the other node though. Not sure whether this is related.
So - does anyone else run a similar "single box" setup, and if you do are you noticing similar constant disk activity? If not could you recommend any troublehooting steps I can take to determine the root cause? While the disk activity is contant, the "bursts" appear random, so it looks like something is going on. Not sure what though! :)
Any replies would be much appreciated.
Peter
Thanks for taking the time to reply.
You are right in that there are a lot of guides around to creating "fake" RAC clusters, however Hunter's guide appears to be one of the best and I found it while browsing around the Oracle website. Of course Oracle stress that it is entirely unsupported and for "education purposes" :)
Well education is what I'm after and I accept that it would perform nowhere near a real cluster. Still the performance issues I'm having appear abnormal.
The background to this is that one the applications I manage at work (Vmware) has a backend DB hosted on RAC. There is an entire database team who look after this area. For my own personal edification I'd like to learn a bit more about RAC (and Oracle in general) and get my hands dirty, though I currently have no long term aspirations to become a full fledged DBA. I'm working through a text on Safari and I thought it would be useful to create a "fake" as you put it cluster at home and play around a bit. Unfortunately the resources to create a "proper" environment are currently not within my means:(
With regards to my problem I was hoping someone here has played around with a similar setup and could advise whether they had similar issues. The 3 days or so I spent labouring through the 60 page guide was far more educational than just reading a text.
I've found that the excessive disk activity appears to be down to my server and Vmware ESXi rather than Oracle. I stopped all instances and CRS and the constant disk activity still continued. I had taken number of snapshots of each linux node during my installation and I'm currently deleting these to see whether this improves things. My hard disk could well be the bottleneck as ESXi is really meant for SCSI controllers and disks if using local datastores.
I'll take your advice and have a trawl through Ebay. I will also install standalone oracle on a seperate box and have a play with that.
Peter
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Thanks for taking the time to reply.
You are right in that there are a lot of guides around to creating "fake" RAC clusters, however Hunter's guide appears to be one of the best and I found it while browsing around the Oracle website. Of course Oracle stress that it is entirely unsupported and for "education purposes" :)
Well education is what I'm after and I accept that it would perform nowhere near a real cluster. Still the performance issues I'm having appear abnormal.
The background to this is that one the applications I manage at work (Vmware) has a backend DB hosted on RAC. There is an entire database team who look after this area. For my own personal edification I'd like to learn a bit more about RAC (and Oracle in general) and get my hands dirty, though I currently have no long term aspirations to become a full fledged DBA. I'm working through a text on Safari and I thought it would be useful to create a "fake" as you put it cluster at home and play around a bit. Unfortunately the resources to create a "proper" environment are currently not within my means:(
With regards to my problem I was hoping someone here has played around with a similar setup and could advise whether they had similar issues. The 3 days or so I spent labouring through the 60 page guide was far more educational than just reading a text.
I've found that the excessive disk activity appears to be down to my server and Vmware ESXi rather than Oracle. I stopped all instances and CRS and the constant disk activity still continued. I had taken number of snapshots of each linux node during my installation and I'm currently deleting these to see whether this improves things. My hard disk could well be the bottleneck as ESXi is really meant for SCSI controllers and disks if using local datastores.
I'll take your advice and have a trawl through Ebay. I will also install standalone oracle on a seperate box and have a play with that.
Peter -
Constant disk activity; who is doing that?
Hello there,
I pimped my G5 with two new internal drives (WD 1TB Caviar Black) and copied onto them clones of other disks and volumes (with SuperDuper), including my old system. Seems to be quite succesful operation; nearly all works as usual again.
Of course I expected mdimport to do some heavy indexing, with constant disk activity as a result.
But, after a couple of days, there is still constant disk activity: every second or so some 5,99MB is being written to disk, according to Activity Monitor.
I do not understand which app is doing this, for no one seems to be very busy at all.
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ServiceLayer.exe and constant disk activity
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I wondered what process was causing HD activity every 5 seconds on my system.
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