![]() ![]() If the checksums don’t match we know the data was changed by something other than ZFS (assuming a ZFS bug isn’t the culprit), and assuming we are using ZFS to RAID protect the storage the issue will be automatically fixed for us.īut what if you have a lot of data on a disk that isn’t read often? ZFS provides a scrub option to read back all of the data in the file system and validate that the data still matches the computed checksum. This feature in EVE can be accessed by running the zpool utility with the “scrub” option and the name of the pool to scrub. ZFS checksums every block of data that is written to disk, and compares this checksum when the data is read back into memory. Increased device longevity (finite erase-write cycles)Īn example of the positive impact of the TRIM team was presented at the OpenZfs conference in 2019 in the presentation of this functionality:.Higher write throughput (less read-erase-modify).Reduced write amplification (fewer writes).The benefit for EVE that we get after implementing the ability to run this command from the controller is the following: This functionality is already implemented in OpenZFS and all we need is to add the ability to control this through the controller. Сan read more about what TRIM is on the wiki. TRIM is a command which allows the filesystem to notify the storage device which blocks are no longer in use. Since commands can negatively affect performance in the course of their work, it is proposed to add the ability for users to set the time for their launch themselves through the controller. And this proposal is to add the ability to instantly launch or schedule these commands on the controller side. The requirement to be able to maintain the storage system and periodically check it for errors comes from EVE customers and also is in line with the requirements for improving the storage system in EVE. #OPENZFS CONFERENCE VERIFICATION#This verification is necessary in order to detect and prevent errors before they cause hardware failure or data corruption in EVE, which is not acceptable to us. There is also a need to periodically check the integrity of the data in EVE in the ZFS configuration using the Scrub function. To solve this problem, ZFS supports the TRIM feature, which helps prevent performance degradation of SSDs. Depending on the type of SSD and how long that drive is loaded, the negative impact on write performance can be significant. ![]() This problem occurs due to the nature of the SSD. When using physical SSDs in a ZFS configuration, write performance degrades over time when the storage system is used for a long time. ![]()
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