Hi Lon, Thanks a lot for your valuable reply, I am waiting for your reply only, i know this type of cluster error i got only during heavy I/O to the shared storage(scsi) even i read the sar report telling that system idle percentage of merry 1 to 2 % at that time.If i go with fibre channel storage can i prevent this type of issues without upgrading the clumanager version. Also Please help me in configuring the below part if your suggesting some thing else for the below thing than also i will be very happy. ############################################################ Also anyone help me to configure a dedicated LAN (for example eth3) as heartbeat(private point to point cross over cable network for cluster communications),I don't wish heartbeat over public LAN , because of heavy Network saturation. Forthe above heartbeat configuration i didn't found any suitable document for RHEL. Can you provide me the suitable link or guide me what are all the changes i have to made in my existing cluster.xml file for this private heartbeat configuration to work. ############################################################# Anticipating your reply On Sat, Nov 15, 2008 at 3:24 AM, Lon Hohberger <lhh@xxxxxxxxxx> wrote: > On Wed, 2008-11-12 at 19:14 +0530, lingu wrote: >> cluquorumd[1921]: <warning> Disk-TB: Detected I/O Hang! > > Eep. > > This means that I/O to shared storage has gotten slow. Strange. I > heard reports of this on another cluster (after going from U3->U8), but > I don't know what the cause is. With this cluster, we straced the > cluquorumd process and found that it was slowing down *a lot* in the > write() call when writing to shared storage. > > You can try the current U9+erratum clumanager or the test release if you > want to (it makes unlock more robust when I/O performance is slow for > some reason). > > However, someone really needs to profile the kernel if you're seeing > slow write times while stracing cluquorumd... > > -- Lon > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster > -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
