zen barcode c# example Figure 4-15. SAN Setup screen in Objective-C

Generating Data Matrix ECC200 in Objective-C Figure 4-15. SAN Setup screen

Figure 4-15. SAN Setup screen
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In this screen, type the volume name and choose what type of data will reside on the volume. Note that you can t use spaces or special characters in the name, nor can you change it, so ensure that whatever you specify will last through the ages. Other than the name, the options you choose during volume creation will directly impact the performance of the SAN in a variety of ways. To see and adjust the settings that the wizard applied (based on your selection of data types), click on the Advanced Settings button, which pops up the window shown in Figure 4-16.
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CHAPTER 4: Storage
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Figure 4-16. Advanced SAN settings
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The most import setting here is the block allocation size. Xsan uses the storage-pool stripe breadth and volume block-allocation size to decide how to write data to a volume. Writes typically impact performance more than reads, so it s important to match these in a manner that makes sense given the type of data the SAN will be storing. As of the time of this writing, Apple hasn t released a tuning guide for Xsan 2.x, but you can find the one for
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CHAPTER 4: Storage
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Xsan 1.x at http://images.apple.com/my/server/docs/20050901_Xsan_Tuning_Guide.pdf. Per the Apple Xsan Deployment and Tuning Guide:
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In general, smaller file system block sizes are best in cases where there are many small, random reads and writes, as when a volume is used for home directories or general file sharing. In cases such as these, the default 4KB block size is best. If, however, the workflow supported by the volume consists mostly of sequential reads or writes, as is the case for audio or video streaming or capture, you can get better performance with a larger block size. Try a 64KB block size in such cases.
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There are other options for this portion of the volume setup. Here is a bit of information about them:
Allocation Strategy: This determines how data is written to the affinity tags (a collection of storage pools----we ll cover them shortly). Round
robin is the default strategy and the recommended one in most cases. It works by simply iterating through storage pools during writes. For instance, when writing file1, round robin will go to storage pool1; when writing file2, it will go to storage pool2. If you want to ensure that your data gets evenly distributed across pools, you can use another approach: balance allocation. This configuration uses the pool that has the most available capacity. Fill allocation, on the other hand, loads storage pools to capacity in sequence; it won t use storagepool2 until storagepool1 runs out of room. The two options, though, can degrade performance, as it s possible for a single LUN to bear a higher percentage of the load over time.
Spotlight: This option lets you enable and disable the OS X system
search tool (Spotlight) for volumes. Given that it doesn t currently work effectively in Xsan 2.x, you should disable it.
Access Control Lists: You can enable and disable ACLs on the volume
using this setting, but typically you should leave it enabled, as ACLs provide for extensible permissions management.
Windows ID Mapping: If Windows machines will participate in the SAN, leave this option at its default----enabled. Allocation Settings: Always check with a technical project manager before customizing any of the following three settings in this section of the dialog box. File Expansion Min: This value determines the minimum number of blocks written to a SAN file for the first expansion request. Increasing it speeds up writes for large files; decreasing it speeds them up for a large number of smaller files. File Expansion Increment: To change the number of blocks used for each expansion request after the first, adjust this number. File Expansion Max: The maximum number of blocks used for the file. Can help to reduce fragmentation on your volume.
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