1SG_SYNC(8) SG3_UTILS SG_SYNC(8)
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6 sg_sync - send SCSI SYNCHRONIZE CACHE command
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9 sg_sync [--16] [--count=COUNT] [--group=GN] [--help] [--immed]
10 [--lba=LBA] [--sync-nv] [--timeout=SECS] [--verbose] [--version] DEVICE
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13 Send SYNCHRONIZE CACHE(10) or SYNCHRONIZE CACHE(16) command to DEVICE.
14 These commands are defined for SCSI block devices (see SBC-3). If suc‐
15 cessful these commands make sure that any blocks whose latest versions
16 are held in cache are written to (also termed as "synchronized with")
17 the medium.
18 If the LBA and COUNT arguments are both zero (their defaults) then all
20 blocks in the cache are synchronized. If LBA is greater than zero while
21 COUNT is zero then blocks in the cache whose addresses are from and
22 including LBA to the highest lba on the device are synchronized. If
23 both LBA and COUNT are non zero then blocks in the cache whose
24 addresses lie in the range LBA to LBA+COUNT-1 inclusive are synchro‐
25 nized with the medium.
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28 Arguments to long options are mandatory for short options as well.
29 -S, --16
31 performs a SYNCHRONIZE CACHE(16) command. Default is to perform
32 a SYNCHRONIZE CACHE(10) command.
33 -c, --count=COUNT
35 where COUNT is the number of blocks to synchronize from and
36 including LBA. Default value is 0. When 0 then all blocks in the
37 cache from and including LBA argument to the highest block
38 address are synchronized.
39 -g, --group=GN
41 where GN is the group number which can be between 0 and 31
42 inclusive. The default value is 0 . Group numbers are used to
43 segregate data collected within the device. This is a new fea‐
44 ture in SBC-2 and can probably be ignored for the time being.
45 -h, --help
47 output the usage message then exit.
48 -i, --immed
50 sets the IMMED bit in the SYNCHRONIZE CACHE command. This
51 instructs the device, if the format of the command is accept‐
52 able, to return a GOOD status immediately rather than wait for
53 the blocks in the cache to be synchronized with (i.e. written
54 to) the medium.
55 -l, --lba=LBA
57 where LBA is the lowest logical block address in the cache to
58 synchronize to the medium. Default value is 0 .
59 -s, --sync-nv
61 synchronize the (volatile) cache with the non-volatile cache.
62 Without this option (or if there is no non-volatile cache in the
63 device) the synchronization is with the medium. The SYNC_NV bit
64 was made obsolete in SBC-3 revision 35d.
65 -t, --timeout=SECS
67 where SECS is the number of seconds the OS allows the SYNCHRO‐
68 NIZE CACHE(16) to complete before it tries to cancel the com‐
69 mand. Cancelling commands (typically with the task management
70 function "abort task") is best avoided. Note this option is only
71 active together with the --16 option. The default timeout is 60
72 seconds for both SYNCHRONIZE CACHE(10) and SYNCHRONIZE
73 CACHE(16). Note that timeout issues can be avoided with the
74 --immed option.
75 -v, --verbose
77 increase the level of verbosity, (i.e. debug output).
78 -V, --version
80 print the version string and then exit.
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83 With the SYNCHRONIZE CACHE(16) command LBA can be up to 64 bits in size
84 and COUNT up to 32 bits in size. With the SYNCHRONIZ CACHE(10) command
85 LBA can be up to 32 bits in size and COUNT up to 16 bits in size.
86 Various numeric arguments (e.g. LBA) may include multiplicative suf‐
88 fixes or be given in hexadecimal. See the "NUMERIC ARGUMENTS" section
89 in the sg3_utils(8) man page.
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92 The exit status of sg_sync is 0 when it is successful. Otherwise see
93 the sg3_utils(8) man page.
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96 Written by Douglas Gilbert.
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99 Report bugs to <dgilbert at interlog dot com>.
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102 Copyright © 2004-2013 Douglas Gilbert
103 This software is distributed under a FreeBSD license. There is NO war‐
104 ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
105 POSE.
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108 sg_start(sg3_utils)
109sg3_utils-1.37 July 2013 SG_SYNC(8)