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The process of adding storage to an Xsan volume, volume expansion, not only provides the benefit of increased capacity, it also can increase bandwidth. On an Xsan 2.0 volume you can perform two types of volume expansion: Storage Expansion and Bandwidth Expansion. With the latter, you add LUNs to an existing storage pool. This is relatively intrusive, though, and you can only do it on volumes built with the Custom data type. You may have to do this when a storage pool isn t configured in a manner consistent with others on the volume, and performance is paramount. This type of expansion will result in a misbalance of information across the storage pool s LUNS, and you ll have to defragment to avoid severe performance degradation. As such, you should always defrag shortly after performing the expansion. Remember, though, because you re modifying existing datastores that the volume uses, bandwidth expansion is inherently risky, and you should avoid it if possible. With storage expansion, you add new LUNs to a an existing affinity tag, which in turn creates a new storage-pool member. Because you re simply introducing elements, this type of expansion isn t as intrusive as a bandwidth expansion, and is less prone to problems. When performing volume expansion, generally you want to add storage in increments equivalent to existing storage pools (typically four LUNs per pool). Xsan 2 will do its best to determine existing pool utilization based on values set in the volume s auxdata.plist file, and you can carry out more granular edits of these as needed.
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CHAPTER 4: Storage
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Prior to running the expansion, we recommend you follow a few procedures. First, ensure that all new LUNs consist of RAID sets that are consistent with the designated affinity tag s current LUNs. TIP: You can determine your volume s ideal LUN count by consulting its respective auxdata.plist file, found at /Library/Filesystems. Next, verify recent backups of the volume by performing a test restore. Now stop the volume, and perform a repair on it using the command:
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cvfsck wv VolumeName
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When that completes, back up the metadata by issuing the command:
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snmetadump -d VolumeName
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Also, perform a cvgather on the volume (which, among other procedures, backs up the volume s configuration files) by entering this at the command line:
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cvgather -f volumeName
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After these steps, you re ready to perform the expansion, which you can do using Xsan Admin by dragging your new, labeled LUN into the desired affinity tag. As mentioned, it s best to add LUNs in numbers compatible with existing settings. So if the volume uses 4 LUN storage pools, the number of LUNs you add during expansion should be divisible by 4. If you have a custom volume, you ll need to manually create the storage pools and assign 4 LUNs to each. After dragging all desired LUNs into the proper affinity tag or storage pools, click Save. The expansion will proceed, generally taking 20 to 30 minutes. Following the actual expansion, it s a good idea to carry out additional maintenance on the volume to ensure proper health. In particular, to ensure that data is properly restriped across the pool, an snfsdefrag is an absolute requirement. Running the command
snfsdefrag -dr /Volumes/VolumeName
will rebalance the data. Even after performing a volume expansion, it may be desirable to rebalance the data onto the newly added storage. By spreading it across the storage more evenly, you not only help prevent slowdowns, you actually get a net gain in speed. That might not be the case if you don t rebalance. In Xsan 1.4, this was usually a straightforward task, because each storage pool had a different affinity name, so you could balance data using, for example:
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