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Full Discussion: Extremely slow file writing with many small files on mounted NAS
Top Forums UNIX for Dummies Questions & Answers Extremely slow file writing with many small files on mounted NAS Post 302946656 by hicksd8 on Thursday 11th of June 2015 05:03:26 AM
Old 06-11-2015
If these are normal hardware RAID controllers (or some software RAID controllers for that matter) you might be able to set the cache; to write-through, write-around and/or write-back.

If the RAID controller cache was set to write-through then the controller will await completion each I/O before proceeding. In the case of millions of small files that would be very painful. You wouldn't see the same degradation with large files because each I/O is bigger.

Search Google (and of course THIS FORUM) for the pro's and con's of these cache settings.
 

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LEARN ABOUT CENTOS

checkrad

CHECKRAD(5)							File Formats Manual						       CHECKRAD(5)

NAME

       checkrad -- See if a user is (still) logged in on a certain port.

SYNOPSIS

       checkrad [-d] nas-type nas-ip nas-port login session-id

DESCRIPTION

       Checkrad  is  used  by  the  radius  server  to check if its idea of a user logged in on a certain port/NAS is correct if a double login is
       detected.

       Returns: 0 = no duplicate, 1 = duplicate, >1 = error.

OPTIONS

       -d     Enable printing of debugging informations.

       nas-type
	      Type of port/NAS. Can be one of:

	      o      ascend

	      o      bay

	      o      cisco

	      o      cisco_l2tp

	      o      computone

	      o      cvx

	      o      digitro

	      o      dot1x

	      o      livingston

	      o      max40xx

	      o      mikrotik

	      o      mikrotik_snmp

	      o      multitech

	      o      netserver

	      o      other

	      o      pathras

	      o      patton

	      o      portslave

	      o      pr3000

	      o      pr4000

	      o      redback

	      o      tc

	      o      usrhiper

	      o      versanet

	      The "other" type cause checkrad to skip any check and always returns 1.

       nas-ip IP address of the NAS to check.

       nas-port
	      The NAS port to check (may be ignored by some nas-type).

       login  The login name to check.

       session-id
	      Session to check. (actually ignored by all nas-type)

SEE ALSO

       radiusd(8)

AUTHOR

       Written by Miquel van Smoorenburg, miquels@cistron.nl.

       This manual page was written by Marco Nenciarini <mnencia@debian.org> for the Debian project (but may be used by others).

								  13 January 2006						       CHECKRAD(5)
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