| [16] | 1 | Introduction |
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| 2 | ------------ |
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| 3 | This directory includes a set of scripts that implements HA-NFS using GPFS |
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| 4 | as the file system. |
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| 5 | |
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| 6 | Network Setup |
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| 7 | ------------- |
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| 8 | Setup an IP address for the GPFS cluster, and a separate set of IP addresses |
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| 9 | (one or more) for NFS serving. Use static IP address. DHCP can not be used. |
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| 10 | |
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| 11 | Dependencies |
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| 12 | ------------ |
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| 13 | (1) Linux heartbeat |
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| 14 | (2) Kernel patch for lockd. (until the code is included in the kernel) |
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| 15 | (3) Fixed sm-notify (until SuSe release the fixed version) |
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| 16 | |
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| 17 | Cluster Setup |
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| 18 | ------------- |
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| 19 | 1. Create a GPFS cluster and file systems. |
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| 20 | |
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| 21 | 2. Create a small file system for the HA-NFS shared files. This file system |
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| 22 | should be configured to be mounted when GPFS starts (mmcrfs -A yes). |
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| 23 | |
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| 24 | 3. Add all file systems but the one for HA-NFS to /etc/exports. |
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| 25 | |
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| 26 | 4. Stop the GPFS cluster on all nodes with mmshutdown -a |
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| 27 | or on one node use /etc/init.d/gpfs stop |
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| 28 | |
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| 29 | 5. Modify .sample files appropriately and copy them to /var/mmfs/etc (drop the .sample extension) |
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| 30 | cp -p /usr/lpp/mmfs/samples/nfscluster/nfsdefs.sample /var/mmfs/etc/nfsdefs |
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| 31 | cp -p /usr/lpp/mmfs/samples/nfscluster/nfs.nodes.sample /var/mmfs/etc/nfs.nodes |
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| 32 | cp -p /usr/lpp/mmfs/samples/nfscluster/alert.sample /var/mmfs/etc/alert |
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| 33 | |
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| 34 | 6. Edit nfsdefs; use the fields as described in the file. |
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| 35 | |
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| 36 | 7. Edit nfs.nodes; each line is a mapping between GPFS IP address and NFS IP |
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| 37 | address(es). One line for every node in the NFS cluster. |
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| 38 | |
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| 39 | 8. Edit alert is optional. This script is invoked to alert an administrator |
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| 40 | that something is wrong with the NFS cluster. Edit this file to match your |
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| 41 | needs. |
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| 42 | |
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| 43 | 9. To complete configuration of GPFS and Linux for HA-NFS on all nodes run the |
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| 44 | following on one node. |
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| 45 | /usr/lpp/mmfs/samples/nfscluster/install_ha-nfs.sh -a /var/mmfs/etc/nfsdefs /var/mmfs/etc/nfs.nodes |
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| 46 | |
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| 47 | 10. Start the GPFS cluster. |
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| 48 | mmstartup -a |
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| 49 | |
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| 50 | |
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| 51 | Notes |
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| 52 | ----- |
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| 53 | Configure GPFS as an HA-NFS cluster: |
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| 54 | |
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| 55 | The following option are already set by install_ha-nfs.sh script. |
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| 56 | |
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| 57 | For better read performance of big files set the following option. |
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| 58 | mmchconfig nfsprefetchstrategy=1 |
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| 59 | |
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| 60 | To get faster recovery time: |
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| 61 | Current lease time and wait time are 35 second. |
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| 62 | Set leaserecoverywait to no less than 10 second. |
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| 63 | mmchconfig leaserecoverywait=10 |
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| 64 | |
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| 65 | Set leaseDuration to no less than 20 second. |
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| 66 | mmchconfig leaseDuration=20 |
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| 67 | |
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| 68 | user exits: |
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| 69 | mmfsup, mmfsup.scr, mmfsdown, and mmfsdown.scr are used by HA-NFS |
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| 70 | all old scripts in /var/mmfs/etc are saved in /var/mmfs/etc.bak |
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| 71 | After HA-NFS installation the user can add a calls to its exits from |
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| 72 | mmfsup.scr or mmfsdown.scr |
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| 73 | The user should NOT create an mmfsup or mmfsdown scripts for now. |
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| 74 | |
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| 75 | bonding: |
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| 76 | If bonding is used add an entry like the following to ifcfg file |
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| 77 | for correct monitoring by mii-tool. |
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| 78 | |
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| 79 | BONDING_MODULE_OPTS='miimon=100 mode=1 use_carrier=0' |
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| 80 | |
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| 81 | Clean-up: |
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| 82 | If GPFS or some other component terminated abnormally you can try |
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| 83 | the following command to avoid reboot. (reboot is recommended) |
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| 84 | /var/mmfs/etc/cleanup |
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| 85 | |
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| 86 | nfs.nodes example: |
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| 87 | # The first column is the IP addresses used for the GPFS cluster. |
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| 88 | # The second column is the IP addresses used to export NFS. |
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| 89 | |
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| 90 | 192.168.2.13 9.1.140.65 |
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| 91 | 192.168.2.14 9.1.140.66 |
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| 92 | 192.168.1.15 9.1.140.67 |
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