Re: Xforce Keygen Lustre 2012 32
Jocelin Taylor
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Other values for the VM SKU or number of instances to use. This example has a headnode (D16_v3), two compute nodes (D32_v3), and four Lustre nodes (L32_v2). There is also an Azurehpc web tool you can use to view a config file by clicking Open and load locally or by passing a URL, for example, the lustre_combined example.
We're using ior to test the performance. Either the AzureHPC or CycleCloud version can be used, but the commands change slightly depending on the image and OS version used. The following commands relate to the lustre_combined AzureHPC example.
By default, the mkfs.lustre utility applies these options to the Lustre backing file system used to store data and metadata in order to enhance Lustre file system performance and scalability. These options include:
It is possible to change the recommended default of 2560 bytes per inode for an ldiskfs MDT when it is first formatted by adding the --mkfsoptions="-i bytes-per-inode" option to mkfs.lustre. Decreasing the inode ratio tunable bytes-per-inode will create more inodes for a given MDT size, but will leave less space for extra per-file metadata and is not recommended. The inode ratio must always be strictly larger than the MDT inode size, which is 1024 bytes by default. It is recommended to use an inode ratio at least 1536 bytes larger than the inode size to ensure the MDT does not run out of space. Increasing the inode ratio with enough space for the most commonly file size (e.g. 5632 or 66560 bytes if 4KB or 64KB files are widely used) is recommended for DoM.
The size of the inode may be changed at format time by adding the --stripe-count-hint=N to have mkfs.lustre automatically calculate a reasonable inode size based on the default stripe count that will be used by the filesystem, or directly by specifying the --mkfsoptions="-I inode-size" option. Increasing the inode size will provide more space in the inode for a larger Lustre file layout, ACLs, user and system extended attributes, SELinux and other security labels, and other internal metadata and DoM data. However, if these features or other in-inode xattrs are not needed, a larger inode size may hurt metadata performance as 2x, 4x, or 8x as much data would be read or written for each MDT inode access.
In environments with few small files, the default inode ratio may result in far too many inodes for the average file size. In this case, performance can be improved by increasing the number of bytes-per-inode. To set the inode ratio, use the --mkfsoptions="-i bytes-per-inode" argument to mkfs.lustre to specify the expected average (mean) size of OST objects. For example, to create an OST with an expected average object size of 8 MiB run:
For large clusters, you can configure the networking setup forall nodes by using a single, unified set of parameters in thelustre.conf file on each node. Cluster-wideconfiguration is described in Chapter 9, Configuring Lustre Networking (LNet).
The version of the kernel running on a Lustre client must be the same as the version of the kmod-lustre-client-ver package being installed, unless the DKMS package is installed. If the kernel running on the client is not compatible, a kernel that is compatible must be installed on the client before the Lustre file system software is used.
kernel-debuginfo, kernel-debuginfo-common, lustre-debuginfo, lustre-osd-ldiskfs-debuginfo- Versions of required packages with debugging symbols and other debugging options enabled for use in troubleshooting.
The version of the kernel running on a Lustre client must be the same as the version of the lustre-client-modules- ver package being installed. If not, a compatible kernel must be installed on the client before the Lustre client packages are installed.
Parameters for LNet can be specified in the /etc/modprobe.d/lustre.conf file. In some cases the parameters may have been stored in /etc/modprobe.conf, but this has been deprecated since before RHEL5 and SLES10, and having a separate /etc/modprobe.d/lustre.conf file simplifies administration and distribution of the Lustre networking configuration. This file contains one or more entries with the syntax:
If a node has more than one network interface, you'll typically want to dedicate a specific interface to Lustre. You can do this by including an entry in the lustre.conf file on the node that sets the LNet module networks parameter:
The ip2nets option is typically used when a single, universal lustre.conf file is run on all servers and clients. Each node identifies the locally available networks based on the listed IP address patterns that match the node's local IP addresses.
Some sample scripts are included in the directory where the Lustre software is installed. If you have installed the Lustre source code, the scripts are located in the lustre/tests sub-directory. These scripts enable quick setup of some simple standard Lustre configurations.
When the target is formatted using the mkfs.lustre command, the failover service node(s) for the target are designated using the --servicenode option. In the example below, an OST with index 0 in the file system testfs is formatted with two service nodes designated to serve as a failover pair:
In general, it is wise to specify noauto and let your high-availability (HA) package manage when to mount the device. If you are not using failover, make sure that networking has been started before mounting a Lustre server. If you are running Red Hat Enterprise Linux, SUSE Linux Enterprise Server, Debian operating system (and perhaps others), use the _netdev flag to ensure that these disks are mounted after the network is up, unless you are using systemd 232 or greater, which recognize lustre as a network filesystem. If you are using lnet.service, use x-systemd.requires=lnet.service regardless of systemd version.
We are mounting by disk label here. The label of a device can be read with e2label. The label of a newly-formatted Lustre server may end in FFFF if the --index option is not specified to mkfs.lustre, meaning that it has yet to be assigned. The assignment takes place when the server is first started, and the disk label is updated. It is recommended that the --index option always be used, which will also ensure that the label is set at format time.
With tunefs.lustre, parameters are additive-- new parameters are specified in addition to old parameters, they do not replace them. To erase all old tunefs.lustre parameters and just use newly-specified parameters, run:
The tunefs.lustre command can be used to set any parameter settable via lctl conf_param and that has its own OBD device, so it can be specified as obdnamefsname. obdtype. proc_file_name= value. For example:
Use lctl set_param to set temporary parameters on the node where it is run. These parameters internally map to corresponding items in the kernel /proc/fs,sys/lnet,lustre and /sys/fs,kernel/debug/lustre virtual filesystems. However, since the mapping between a particular parameter name and the underlying virtual pathname may change, it is not recommended to access the virtual pathname directly. The lctl set_param command uses this syntax:
Use lctl set_param -P or lctl conf_param command to set permanent parameters. In general, the set_param -P command is preferred for new parameters, as this isolates the parameter settings from the MDT and OST device configuration, and is consistent with the common lctl get_param and lctl set_param commands. The lctl conf_param command was previously used to specify settable parameter, with the following syntax (the same as the mkfs.lustre and tunefs.lustre commands):
Two options to mkfs.lustre can be used to specify failover nodes. The --servicenode option is used to specify all service NIDs, including those for primary nodes and failover nodes. When the --servicenode option is used, the first service node to load the target device becomes the primary service node, while nodes corresponding to the other specified NIDs become failover locations for the target device. An older option, --failnode, specifies just the NIDs of failover nodes. For more information about the --servicenode and --failnode options, see Chapter 11, Configuring Failover in a Lustre File System.
If the Lustre file system configuration logs are in a state where the file system cannot be started, use the tunefs.lustre --writeconf command to regenerate them. After the writeconf command is run and the servers restart, the configuration logs are re-generated and stored on the MGS (as with a new file system).
If you need to change only the NID of the MDT or OST, the replace_nids command can simplify this process.The replace_nids command differs fromtunefs.lustre --writeconf in that it does noterase the entire configuration log, precluding the need the need toexecute the writeconf command on all servers and re-specify all permanent parameter settings. However, thewriteconf command can still be used if desired.
Add a new OST by using mkfs.lustre as when the filesystem was first formatted, see 4 for details. Each new OST must have a unique index number, use lctl dl to see a list of all OSTs. For example, to add a new OST at index 12 to the testfs filesystem run following commands should be run on the OSS:
To replace an OST that was removed from service due to corruption or hardware failure, the replacement OST needs to be formatted using mkfs.lustre, and the Lustre file system configuration should be restored, if available. Any objects stored on the OST will be permanently lost, and files using the OST should be deleted and/or restored from backup.
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