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- LFSCHKPT User Commands LFSCHKPT
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- _________________________________________________________________
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- NNAAMMEE
- lfschkpt - Display or modify the checkpoint fields of an LFS
- file system.
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- SSYYNNOOPPSSIISS
- llffsscchhkkpptt [[_o_p_t_i_o_n_s] _d_e_v_i_c_e_N_a_m_e
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- OOPPTTIIOONNSS
- _d_e_v_i_c_e_N_a_m_e The device on which the file system should be
- created. The partition should contain an
- unmounted LFS file system. WARNING: This pro-
- gram should not be run on a running (attached)
- file system.
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- --mmaaxxNNuummCCaacchheeBBlloocckkss _N_u_m_C_a_c_h_e_B_l_o_c_k_s
- _N_u_m_C_a_c_h_e_B_l_o_c_k_s is the maximum number of file
- cache blocks to used during cleaning.
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- --cchheecckkppooiinnttIInntteerrvvaall _C_h_e_c_k_p_o_i_n_t_I_n_t_e_r_v_a_l
- _C_h_e_c_k_p_o_i_n_t_I_n_t_e_r_v_a_l is the frequency in seconds
- to perform checkpoints.
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- --ddoommaaiinnNNuummbbeerr _D_o_m_a_i_n_N_u_m_b_e_r
- _D_o_m_a_i_n_N_u_m_b_e_r is the Sprite domain number
- assigned to this file system. A value of -1
- will caused to system to assign it a number
- upon the next attach.
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- --sseerrvveerrIIDD _i_d _i_d is the Sprite hostname id specified in the
- superblock. This id is used to inform a
- machine of its name at boot time.
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- --mmaaxxUUttiilliizzaattiioonn _U_t_i_l_i_z_a_t_i_o_n
- _U_t_i_l_i_z_a_t_i_o_n is the maximum fraction of the
- disk space usable by the file system.
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- --mmaaxxDDeesscc _N_u_m_D_e_s_c
- _N_u_m_D_e_s_c is the maximum number of descriptors
- available in the file system. A negative value
- causes mklfs to compute this number based on
- the disk size.
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- --sseeggAAlliiggnnmmeenntt _A_l_i_g_n_m_e_n_t
- _A_l_i_g_n_m_e_n_t is the alignment in bytes where the
- first segment should start.
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- --mmiinnNNuummCClleeaann _n_u_m_S_e_g_m_e_n_t_s
- _n_u_m_S_e_g_m_e_n_t_s is minimum number of clean seg-
- ments to maintain in the file system. This
- number acts as an lower bound as when to start
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- Sprite v.1.0 Printed: July 17, 1991 1
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- LFSCHKPT User Commands LFSCHKPT
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- segment cleaning.
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- --mmiinnFFrreeeeBBlloocckkss _n_u_m_B_l_o_c_k_s
- _n_u_m_B_l_o_c_k_s is minimum number of free blocks
- before the system will stop allowing block
- allocate requests. This number decides the
- maximum disk space utilization.
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- --wwaasstteeBBlloocckkss _n_u_m_B_l_o_c_k_s
- _n_u_m_B_l_o_c_k_s is the number of blocks the system
- will waste while filling in a segment.
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- --nnuummSSeeggssTTooCClleeaann _n_u_m_S_e_g_m_e_n_t_s
- _n_u_m_S_e_g_m_e_n_t_s is number of segments the segment
- cleaner will generate This number acts as the
- threshold under which cleaning is stopped.
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- --bbootthh Display both checkpoint regions.
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- --wwrriittee Apply requested changes to the disk.
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- _________________________________________________________________
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- DDEESSCCRRIIPPTTIIOONN
- LLffsscchhkkpptt displays the LFS superblock and checkpoint region
- headers and allows for the user to specify changes to these
- data structures. With no arguments specified, Blfschkpt
- displays the data structures. The --wwrriittee option allows
- changes to be made to the disk and should only be run when
- the file system is not attached. The rest of the options
- specify field names in the LfsSuperBlock and LfsCheck-
- PointHdr data structures that may be changed. A field
- value of -2 (the default) means no change.
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- WWAARRNNIINNGG
- LLffsscchhkkpptt does no error checks on changes being made. It is
- possible to render the file system unattachable with this
- command.
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- KKEEYYWWOORRDDSS
- filesystem, LFS, sprite
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- Sprite v.1.0 Printed: July 17, 1991 2
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