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Using SSD in FreeBSD

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Operating Systems BSD Using SSD in FreeBSD
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Old 12-06-2009
Using SSD in FreeBSD
Now that SSD drives are becoming mainstream, I had a few questions on installing a SSD drive in a FreeBSD environment. Can FreeBSD be made SSD aware, that is, somehow let FreeBSD know that reads and writes should be limited or deferred to extend the disk's life? Is there a setting for wear levelling? Also, for large databases, is SLC or MLC recommended?

Thanks in advance
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LEARN ABOUT FREEBSD

cd

CD(9)							   BSD Kernel Developer's Manual						     CD(9)

NAME

     cd -- CDROM driver for the CAM SCSI subsystem

DESCRIPTION

     The cd device driver provides a read only interface for CDROM drives (SCSI type 5) and WORM drives (SCSI type 4) that support CDROM type com-
     mands.  Some drives do not behave as the driver expects.  See the QUIRKS section for information on possible flags.

QUIRKS

     Each CD-ROM device can have different interpretations of the SCSI spec.  This can lead to drives requiring special handling in the driver.
     The following is a list of quirks that the driver recognize.

     CD_Q_NO_TOUCH    This flag tells the driver not to probe the drive at attach time to see if there is a disk in the drive and find out what
		      size it is.  This flag is currently unimplemented in the CAM cd driver.

     CD_Q_BCD_TRACKS  This flag is for broken drives that return the track numbers in packed BCD instead of straight decimal.  If the drive seems
		      to skip tracks (tracks 10-15 are skipped) then you have a drive that is in need of this flag.

     CD_Q_NO_CHANGER  This flag tells the driver that the device in question is not a changer.	This is only necessary for a CDROM device with
		      multiple luns that are not a part of a changer.

     CD_Q_CHANGER     This flag tells the driver that the given device is a multi-lun changer.	In general, the driver will figure this out auto-
		      matically when it sees a LUN greater than 0.  Setting this flag only has the effect of telling the driver to run the initial
		      read capacity command for LUN 0 of the changer through the changer scheduling code.

     CD_Q_10_BYTE_ONLY
		      This flag tells the driver that the given device only accepts 10 byte MODE SENSE/MODE SELECT commands.  In general these
		      types of quirks should not be added to the cd(4) driver.	The reason is that the driver does several things to attempt to
		      determine whether the drive in question needs 10 byte commands.  First, it issues a CAM Path Inquiry command to determine
		      whether the protocol that the drive speaks typically only allows 10 byte commands.  (ATAPI and USB are two prominent exam-
		      ples of protocols where you generally only want to send 10 byte commands.)  Then, if it gets an ILLEGAL REQUEST error back
		      from a 6 byte MODE SENSE or MODE SELECT command, it attempts to send the 10 byte version of the command instead.	The only
		      reason you would need a quirk is if your drive uses a protocol (e.g., SCSI) that typically does not have a problem with 6
		      byte commands.

FILES

     /sys/cam/scsi/scsi_cd.c  is the driver source file.

SEE ALSO

     cd(4), scsi(4)

HISTORY

     The cd manual page first appeared in FreeBSD 2.2.

AUTHORS

     This manual page was written by John-Mark Gurney <jmg@FreeBSD.org>.  It was updated for CAM and FreeBSD 3.0 by Kenneth Merry
     <ken@FreeBSD.org>.

BSD
								  March 25, 2014							       BSD