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Upgrade to OneFS 8.2 Performance to the Isilon may be degraded or appear temporarily unresponsive after upgrading to OneFS 8.2. One symptom of this is that the network receive queue for port 445 will be non-zero while CPU/disk and other performance metrics do not indicate a problem.
There was a 32 work item queue introduced via a scheduler for handing SMB traffic in OneFS 8.2. If this queue gets filled up, the 33rd request goes into a pending state awaiting resources. The 32 work item limit is based off of individual TCP connections. Therefore, a client using multichannel would have 32 work items per TCP connection.
Please consult with Isilon Technical Support if there are any questions regarding this problem. There are two different fixes currently available: In the event that change notify is taking up all or a majority of the 32 work items, there is the generally available patch starting with September roll up: 255567. This patch prevents change notify specifically from taking up any of the slots in the 32 work item queue. Starting in the September directed availability patch 255568, the scheduler can be turned off via a gconfig setting. This change reverts the lwio thread handling to not use the scheduler as in OneFS 8.1 and 8.0. The setting exists already in OneFS 8.2 but cannot take effect prior to the code fix. If you are going to install the patch for this issue, it is recommended to change the setting prior to the patch install as restarting lwio is recommended for the change to take effect: # isi_gconfig registry.Services.scheduler.Parameters.LimitingEnabled=0 If the patch 255568 or later is already installed, make the setting change and then restart lwio across the cluster during a maintenance window: # isi_gconfig registry.Services.scheduler.Parameters.LimitingEnabled=0 # isi_for_array -sX /usr/likewise/bin/lwsm restart lwio
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