We then notified Apple engineers of the bug and helped them investigate it. We determined that this bug was in the code which transfers data to and from disks when accessing files on SoftRAID volumes. Most SoftRAID users on Macs with Apple silicon never see this problem. This bug happens so infrequently that it took our testers more than a year to figure out a way of reproducing it. Reading or writing the same file to the same volume on an Intel Mac never fails. This transition introduced a bug which very occasionally causes a kernel panic when reading or writing files to SoftRAID RAID 5 volumes on Macs with Apple silicon. This was the case with the transition to Macs with Apple silicon. Sometimes, the change in CPU type also introduces bugs. With each of these changes, not only are the instructions used by the CPUs totally different, but the mechanism used to access main memory has changed as well. Here are the details.Īpple has changed the CPU used in Mac computers many times in the past 30 years first from Motorola to Power PC, then from Power PC to Intel, and most recently from Intel to Apple silicon.Įach time, the macOS development team has done incredible work of hiding the fact that macOS software, your applications, and all of your files are running on a completely different type of processor. Today, Apple released macOS 13.4 and along with it a long-awaited fix for an issue that some SoftRAID users have been experiencing with RAID 5 volumes.
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