11-02-2019
How to find out and monitor IO spikes history in Linux?
hello all
i have application which according to AWS monitoring is reaching to high spikes of IO at random time .
and causing the server to crash and restart .
my question is how can i find out what cause the spike and if i can't with the native linux tools
what free open source minimon intrusive monitor i can use ?
thanks
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LEARN ABOUT SUSE
uuid_generate
UUID_GENERATE(3) Libuuid API UUID_GENERATE(3)
NAME
uuid_generate, uuid_generate_random, uuid_generate_time - create a new unique UUID value
SYNOPSIS
#include <uuid/uuid.h>
void uuid_generate(uuid_t out);
void uuid_generate_random(uuid_t out);
void uuid_generate_time(uuid_t out);
DESCRIPTION
The uuid_generate function creates a new universally unique identifier (UUID). The uuid will be generated based on high-quality randomness
from /dev/urandom, if available. If it is not available, then uuid_generate will use an alternative algorithm which uses the current time,
the local ethernet MAC address (if available), and random data generated using a pseudo-random generator.
The uuid_generate_random function forces the use of the all-random UUID format, even if a high-quality random number generator (i.e.,
/dev/urandom) is not available, in which case a pseudo-random generator will be subsituted. Note that the use of a pseudo-random generator
may compromise the uniqueness of UUID's generated in this fashion.
The uuid_generate_time function forces the use of the alternative algorithm which uses the current time and the local ethernet MAC address
(if available). This algorithm used to be the default one used to generate UUID, but because of the use of the ethernet MAC address, it
can leak information about when and where the UUID was generated. This can cause privacy problems in some applications, so the uuid_gener-
ate function only uses this algorithm if a high-quality source of randomness is not available.
The UUID is 16 bytes (128 bits) long, which gives approximately 3.4x10^38 unique values (there are approximately 10^80 elemntary particles
in the universe according to Carl Sagan's Cosmos). The new UUID can reasonably be considered unique among all UUIDs created on the local
system, and among UUIDs created on other systems in the past and in the future.
RETURN VALUE
The newly created UUID is returned in the memory location pointed to by out.
CONFORMING TO
OSF DCE 1.1
AUTHOR
Theodore Y. Ts'o
AVAILABILITY
libuuid is part of the util-linux-ng package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-
ng/.
SEE ALSO
uuid(3), uuidgen(1), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_is_null(3), uuid_parse(3), uuid_time(3), uuid_unparse(3)
util-linux-ng May 2009 UUID_GENERATE(3)