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To prefer a pool of segments for NFS/CIFS clients, specify only NFS/CIFS servers in the HOSTLIST.

To prefer a pool of segments for X9000 clients, lists the X9000 clients in HOSTLIST or specify a

hostgroup in the GROUPLIST. To prefer all X9000 clients, specify the clients hostgroup.

Prefer a tier for the specified hosts or hostgroups:

ibrix_fs_tune -f FSNAME {-h HOSTLIST | -g GROUPLIST} -t TIERNAME

Tune allocation policy storage settings globally on the specified file system:

ibrix_fs_tune -f FSNAME -O [-p POLICY] [-S STARTSEGNUM] [-P prealloc

(KB)] [-r readahead (KB)] [-N NFS readahead (KB)]

The following settings can be tuned:

• Default allocation policy for all hosts

• Default starting segment number for applying settings

• Number of KB to allocate for a file at one time (prealloc)

• Number of KB that X9000 Software will pre-fetch (readahead)

• Number of KB that X9000 Software will pre-fetch under NFS (NFS readahead)

The default for prealloc is 256 KB. The defaults for readahead and NFS readahead are

128 KB.

List preferred segments or allocation policy for the specified hosts, hostgroups, or file system:

ibrix_fs_tune -l [-h HOSTLIST | —g GROUPLIST] [-f FSNAME]

The -S option lists preferred segments. The -P option lists allocation policy.

List the preferred segments on the specified file serving nodes or hostgroups:

ibrix_fs_tune {-h HOSTLIST|-g GROUPLIST} -l -S

Options

DescriptionOption

Specifies the number of KB that X9000 Software pre-fetches under NFS. The default

value is 128 KB.

-N NFS readahead

Sets one or more allocation policy tuning options.-O

Sets the number of KB a file system pre-allocates to a file. Default: 256 KB.-P prealloc

Sets allocation policy for directory segments only.-R

Specifies a segment.-S SEGMENT_NUMBER

Specifies a list of segments to prefer, prefers all segments, or restricts clients to using

segments local to the file serving nodes listed in the command. ALL and LOCAL are

keywords.

-S SEGNUMLIST| ALL|LOCAL

Identifies the first segment to which an allocation policy is applied in a file system.-S STARTSEGNUM

Resets an allocation policy.-U

A file system.-f FSNAME

A list of hostgroups.-g GROUPLIST

A list of one or more file serving nodes or X9000 clients-h HOSTLIST

Lists allocation policies for users, groups, or file systems.-l u|g|f

Sets allocation policy on a file system and optionally on a list of hosts or groups.

Policy type names are case-sensitive and must be entered as shown: ROUNDROBIN,

STICKY, DIRECTORY, LOCAL, RANDOM, NONE, HOST_ROUNDROBIN_NB.

-p POLICY

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