우분투 SSD 설정하기

fstab에서 마운트 옵션을 noatime, discard 를 추가해주면 된다고 한다.
noatime은 atime(Access TIME)을 변경하지 않도록 하는 것이고
discard는 블럭이 사용하지 않을때 TRIM 명령을 사용하도록 하는 것이다.

noatime Do not update inode access times on this filesystem (e.g, for faster access on the news spool to speed up news servers).  discard/nodiscard Controls whether ext4 should issue discard/TRIM commands to the underlying block device when blocks are freed. This is useful for SSD devices and sparse/thinly-provisioned LUNs, but it is off by default until sufficient testing has been done. [링크 : http://linux.die.net/man/8/mount]

아무튼 fstrim을 통해서 주기적으로 해주라는데 이건 옵션적인거니까 머 일단 패스?

FSTRIM(8)                                                            FSTRIM(8) NAME        fstrim - discard unused blocks on a mounted filesystem SYNOPSIS        fstrim [-o offset] [-l length] [-m minimum-extent] [-v] mountpoint DESCRIPTION        fstrim  is  used  on a mounted filesystem to discard (or "trim") blocks        which are not in use by the filesystem.  This is useful for solid-state        drives (SSDs) and thinly-provisioned storage.        By  default,  fstrim  will discard all unused blocks in the filesystem.        Options may be used to modify this behavior based on range or size,  as        explained below.        The  mountpoint  argument  is  the  pathname of the directory where the        filesystem is mounted. OPTIONS        The offset, length, and minimum-free-extent arguments may  be  followed        by  binary  (2^N) suffixes KiB, MiB, GiB, TiB, PiB and EiB (the "iB" is        optional, e.g. "K" has the same meaning as  "KiB")  or  decimal  (10^N)        suffixes KB, MB, GB, PB and EB.        -h, --help               Print help and exit.        -o, --offset offset               Byte offset in filesystem from which to begin searching for free               blocks to discard.  Default  value  is  zero,  starting  at  the               beginning of the filesystem.        -l, --length length               Number  of  bytes after starting point to search for free blocks               to discard.  If the specified value extends past the end of  the               filesystem,  fstrim  will  stop at the filesystem size boundary.               Default value extends to the end of the filesystem.        -m, --minimum minimum-free-extent               Minimum contiguous free range to discard, in bytes. (This  value               is  internally  rounded up to a multiple of the filesystem block               size).  Free ranges smaller  than  this  will  be  ignored.   By               increasing  this  value, the fstrim operation will complete more               quickly  for  filesystems  with  badly   fragmented   freespace,               although  not  all  blocks  will be discarded.  Default value is               zero, discard every free block.        -v, --verbose               Verbose execution. When specified fstrim will output the  number               of  bytes passed from the filesystem down the block stack to the               device for potential discard. This number is a  maximum  discard               amount  from  the  storage  device's perspective, because FITRIM               ioctl called repeated will keep sending  the  same  sectors  for               discard repeatedly.               fstrim  will  report the same potential discard bytes each time,               but only sectors which had been written to between the  discards               would actually be discarded by the storage device.  Further, the               kernel block layer reserves the  right  to  adjust  the  discard               ranges  to fit raid stripe geometry, non-trim capable devices in               a LVM setup, etc.  These reductions would not  be  reflected  in               fstrim_range.len (the --length option). AUTHOR        Lukas Czerner <lczerner@redhat.com>        Karel Zak <kzak@redhat.com> SEE ALSO        mount(8) AVAILABILITY        The  fstrim  command is part of the util-linux package and is available        from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.                                    Nov 2010                          FSTRIM(8)

[링크 : http://www.wilderssecurity.com/showthread.php?t=310021]