Ideally, you'd use an SLC-based SSD (Intel X25-E, for example) as those are optimised for writes, and all log I/O is writes. However, the usage patterns for cache and log devices are very different, and using the wrong kind of SSD for a log device can have adverse effects. log devices rarely need to be larger than 8 GB, and it's near impossible to find an SSD that small these days. To the OP: there's nothing inherently wrong with using the same SSD for both log and cache devices.
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