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Operating Systems Linux Red Hat Multipath.conf configuration max_fds Post 302604832 by Tommyk on Tuesday 6th of March 2012 05:29:05 AM
Old 03-06-2012
Multipath.conf configuration max_fds

Hi all,

I am looking at the specific configuration settings for multipath.conf on RHEL5.5.

In particular i was looking at the max_fds setting. Can anyone tell me the max number of open file descriptors that the RHEL5.5 system can have?

It has been set previously to 8192, and i was wondering if this value is correct. should it be higher or lower and what are the implications of setting this value either higher or lower?

my current defaults are as below:

Code:
defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        path_checker            readsector0
        rr_min_io               100
        max_fds                 8192
        rr_weight               priorities
        failback                0
        features                "fail_if_no_path"
        no_path_retry           5
}

and my devices specific settings are as follows:

Code:
devices {
        device {
        vendor                  "(HITACHI|HP)"
        product                 "OPEN-.*"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        path_checker            hp-sw
        path_selector           "round-robin 0"
        hardware_handler        "0"
        failback                0
        rr_weight               priorities
        no_path_retry           queue
}

If anyone has a good amount of experience on this and can provide any insight into any issues with this i would be grateful to hear it. The SAN disk it is attached to is an HP24000 disk array.

Cheers,
Tom
 

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merge_fonts(3alleg4)						  Allegro manual					      merge_fonts(3alleg4)

NAME
merge_fonts - Merges two fonts into one font. Allegro game programming library. SYNOPSIS
#include <allegro.h> FONT *merge_fonts(FONT *f1, FONT *f2) DESCRIPTION
This function merges the character ranges from two fonts and returns a new font containing all characters in the old fonts. In general, you cannot merge fonts of different types (eg, TrueType fonts and bitmapped fonts), but as a special case, this function can promote a mono- chrome bitmapped font to a color font and merge those. Example: FONT *myfont; FONT *myfancy_font; FONT *lower_range; FONT *upper_range; FONT *capitals; FONT *combined_font; FONT *tempfont; ... /* Create a font that contains the capitals from */ /* the fancy font but other characters from myfont */ lower_range = extract_font_range(myfont, -1, 'A'-1); upper_range = extract_font_range(myfont, 'Z'+1, -1); capitals = extract_font_range(myfancy_font, 'A', 'Z'); tempfont = merge_fonts(lower_range, capitals); combined_font = merge_fonts(tempfont, upper_range); /* Clean up temporary fonts */ destroy_font(lower_range); destroy_font(upper_range); destroy_font(capitals); destroy_font(tempfont); RETURN VALUE
Returns a pointer to the new font or NULL on error. Remember that you are responsible for destroying the font when you are finished with it to avoid memory leaks. SEE ALSO
extract_font_range(3alleg4), is_trans_font(3alleg4), is_color_font(3alleg4), is_mono_font(3alleg4), exfont(3alleg4) Allegro version 4.4.2 merge_fonts(3alleg4)
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