Can anyone tell me the function of these two files(IDS and LEASE)?
发送时间: 2013年6月13日 21:57
抄送: Luohao (brian); Wangshen (C); Xujunxi
主题: [About the IDS and LEASE file in VDSM] Why don't merge those two files into
one file with the different file offset?
I hava a question about the IDS and lease file in the VDSM. In the demo code of
sanlock, these two files are contained in the same file.
In the VDSM 4.09, the offset of IDS is 0. However, the value of offset in
version 4.10 is 'SDM_LEASE_OFFSET = 512 * 2048'. The comment in the code
explains that the differences for them are just for upgrade.
According to my understanding, the content of IDS file contains the current
cluster lock of the domain, and those in Lease file are the heart-beat info.
Why don't merge those two files into one file with the different file offset?
In 4.09/4.10, we maintance two files. I think that 'two files' is much more
complex than 'one file'.
Could anyone explain this for me?
sample code in sanlock(version 2.7), the cluster lock and heart-beat info are
contained in 'disk':
HOST_ID = 1
LOCKSPACE_NAME = "lockspace1"
RESOURCE_NAME = "resource1"
print "Creating the sanlock disk"
fd, disk = tempfile.mkstemp() # the lease file and
ids file are contained in ‘disk’
offset = sanlock.get_alignment(disk)
SNLK_DISKS = [(disk, offset)]
print "Registering to sanlock"
fd = sanlock.register()
print "Initializing '%s'" % (LOCKSPACE_NAME,)
print "Initializing '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME)
sanlock.write_resource(LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS)
print "Acquiring the id '%i' on '%s'" % (HOST_ID, LOCKSPACE_NAME)
sanlock.add_lockspace(LOCKSPACE_NAME, HOST_ID, disk)
print "Acquiring '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME)
sanlock.acquire(LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS, slkfd=fd,
print "Releasing '%s' on '%s'" % (RESOURCE_NAME, LOCKSPACE_NAME)
sanlock.release(LOCKSPACE_NAME, RESOURCE_NAME, SNLK_DISKS, slkfd=fd)
print "Releasing the id '%i' on '%s'" % (HOST_ID, LOCKSPACE_NAME)
sanlock.rem_lockspace(LOCKSPACE_NAME, HOST_ID, disk)
print "Removing the sanlock disk"
if __name__ == '__main__':
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