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Assuming that authentication problems aren't keeping you from accessing a share, the most likely culprit is access control. Carefully substantiate that you haven't blocked client access due to global hosts deny restrictions. Are read-write permissions being applied the way you expect To verify general access, use smbclient to connect a common share like a home directory defined by the [homes] section in smb.conf (Example 15.13). Any share will do. Invoke smbclient with the share name. If the share requires authentication, you should be prompted for a password. Once the share is authenticated, you should have access to it. Example 15.13 Samba Home Share Access $ smbclient //wizard/deroest Password: Domain = [EYRIE] OS = [Unix] Serve r= [Samba 2.0.5a] Smb: \> Also try connecting the share from a Windows client using the NET USE command or Windows Explorer Tools Map a Network Device (Figure 15.3). C:\NET USE J: \\<server NetBIOS name>\<share name> In the case of printer shares, make sure that you have correctly identified printcap printers and that they are marked as printable. Next confirm that the printing os type is set and that it corresponds to the print command and lpq command parameters. If you are providing downloadable Windows 9x printer drivers, verify that the printer driver name and printer driver location directory are correct and readable. The printer driver name is case sensitive and must exactly match the name expected by the Windows driver install procedure. Always print a test page as part of the Windows network printer driver install to make sure features like fonts and colors are working as expected.
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Figure 15.3: Windows Explorer map network device
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Use testprns to quickly determine whether a given printer name is valid for use. It is a good idea always to specify the printcap file as a command argument when testing access. Supply the full path name of the printcap file as an argument to limit confusion. $ testprns <printer name> [<printcap-file>]
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When it comes to tweaking additional cycles out of Samba, one of the first suggestions is to dedicate one or more computers to the service. This allows you to tune and tailor the operating system to meet Samba's resource demands. It also limits the number of things that go wrong. It is not uncommon in UNIX to have one service severely influence or interrupt another service if they are running on the same hardware. You might also consider setting up a "cluster" of Samba servers and distributing load across the cluster. Clusters often require the use of hybrid name services that map a service name to multiple IP addresses. Use OS native performance monitoring tools to gauge the general wellness of the server platform. Again, this will be much easier if Samba is the only service running on the machine. Look for problems indicated by high CPU activity, large amounts of spawned processing, long scheduling queues, large memory usage, and high paging rates.
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System sluggishness related to IO can be monitored using the UNIX iostat command. Use the d option to display disk IO activity. For each disk, statistics include the number of transfers per second, bytes transferred per second and milliseconds per average seek. Note that not all drive types will report seek times. You can also specify a time interval and count for recording activity snapshots over time. # iostat -d [drive ...] [interval] [count] Take a close look at Samba locking options. For shares that require locking, it is a good idea to make sure that opportunistic locking (oplock) parameters are enabled. oplocks allow clients to use aggressive caching and can achieve performance improvements over standard locking by as much as 30%. Also consider disabling strict locking. When enabled, strict locking directs the server to check lock status on every file access. The majority of network tuning should be handled at the OS level. Samba does provide a socket option parameter for adjusting tcp and socket settings like buffer size and keep alive time (Table 15.5). The tcp_nodelay value is the only one enabled by default. Any value adjustments made with these parameters need to fit corresponding OS level settings. socket option = <value list> socket option = tcp_nodelay so_reuseaddr Table 15.5 Samba Socket Option Values
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so_keepalive so_reuseaddr so_broadcast tcp_nodelay iptos_lowdelay iptos_throughput so_sndbuf=<integer> so_rcvbuf=<integer> so_sndlowat=<integer> so_rcvlowat=<integer>
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