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Creating and modifying file systems5–44

You can manage space on OST services as follows:

• By changing the threshold at which the alert triggers, as described in Section 5.11.1.

• By deleting files when one or more OST services become too full.

Use the information provided in Section 5.11.2 to help you to identify which files have components

on a specific OST service. (Note that you can delete files from an OST service even if the service has

been deactivated.)

• By deactivating an OST service that is becoming full.

The process for deactivating OST services is described in Section 5.11.3. When you deactivate an

OST service, no new files will be created on the service. However, access to existing files on the OST

service (for both read and write operations) is unaffected, and the OST service can continue to grow

in size.

5.11.1Managing out-of-space alerts

The attributes that specify the critical and warning thresholds for out-of-space events are as follows:

• The ost_critical_size attribute determines when a critical event occurs; by default, this is set to

95(%).

• The ost_warning_size attribute determines when a warning event occurs; by default, this is

set to 80(%).

You can change the value of these attributes (which are specified as a percentage) using the set

attribute command, as shown in the following examples:

sfs> set attribute ost_critical_size=85

sfs> set attribute ost_warning_size=70

5.11.2Identifying files on OST services

If you decide to delete files from a specific OST service, you must first identify which files have components

on the service. To do this, run the lfs find command on any client node where the file system is mounted,

as shown in the following example. (Do not run the command on a server in the HP SFS system.)

In this example, the HP SFS system is called south, the OST service is ost3, and the file system is mounted

on the /data mount point:

# lfs find --recursive --obd south-ost3_UUID /data

The lfs find command lists the full path name of each file. You can use the output of the command to

help you to identify which files occupy the most space on a given OST service. Each file listed by the lfs

find --obd command has at least one component of the file striped on the OST service. If the file has a

stripe count greater than one, other OST services may also hold some of the content of the file.

5.11.3Deactivating OST services

If you are aware that OST services are filling up and may become too full, use the show filesystem

filesystem_name command to review the sizes and percentage space used on the OST services.

If you decide that one or more OST services are becoming too full, you can deactivate the services as

follows:

1. Stop the affected file system(s).

2. Deactivate the OST services by entering the command shown in the following example, where ost3

and ost7 are deactivated:

sfs> deactivate ost[3,7]

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 361 362

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Hp StorageWorks Scalable File Share Manuale Utente Pagina 128