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Ensure we have enough erased blocks to write into to avoid blocking new writes.Ħ. Try to distribute data evenly across the flash dies?ĥ. How many times was this block read? Maybe it is time to relocate it before we risk read-disturb issues?Ĥ.
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How long does the write takes? Maybe it is time to retire this block because it is near dead for unknown reasons?ģ. How many bits of error did we detect in the read? Maybe it's time to relocate the data before it dies completely?Ģ. One part is that there are many things that the SSD controller does and keeps track of in order to increase the endurance to the maximum, things like:ġ. There are quite a bit more complicated issues that require handling than just the erase count for each erase block. If the block is from somewhere else then it doesn't matter if it comes from this SSD or that SSD. If the next block requested is after the last blocks read it will use the same SSD. The only thing that will affect things is reading file system blocks from the same SSD page/block. This is not needed for an SSD as it doesn't have to wait for the sectors to show up under the head. The main benefit of a drive cache while reading is for read ahead. It's not necessary for performance and doesn't do as much as on a HDD if present. There are SSD controllers that don't use a RAM cache on the drive. Now that I know what you're talking about, let's try to answer your question. Was there an insight you wanted to mention?" So instead of clarifying things you decided to be rude. Instead of replying back "I was talking about the SSD cache" you replay back with "Well, it could hardly be below, could it. I may have misread your original post but your hostility isn't helping to clarify things. Yes, the RAID implementation can't help with this. The cache I'm interested in is tied up in how the SSD presents as a block device, but isn't implemented as a block device, as block devices are normally understood (wear levelling and remapping, hidden parallelism / striping, etc.).
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The md drivers do not have this information There is no "metadata relevant to the SSD innards" available. I'm trying to figure out how, exactly, you've read my attempt at excessive clarity it's not clear to me yet what you misread, since it seems like you're trying to correct some misunderstanding, but it hasn't worked because you haven't said anything that isn't already blindingly obvious. Let me clarify what I was saying: I was redundantly (for clarity) talking about cache on the SSD, trying to make it extra clear that I wasn't talking about any kernel cache.