With ZFS all writes are done over a rambased write cache for best performance.
On a powerloss or crash, all writes in the cache are lost. You can then enable sync write. This is an additional logging of last writes, think of it like a BBU on hardwareraid. As disks are quite slow with small random writes, performace can fall to a fraction of normal cached write performance.
This is where an Slog can help if it is optimised for small random writes . It must offer powerloss protection or it cannot guarantee last writes.
One of the cheapest SSDs that is really suited for an slog is an Intel S3700 (100 or 200GB).
see Top Picks for napp-it and OmniOS ZIL/ SLOG Drives
btw
have you modified sd.conf for the SSD or not?
The behaviour that you have seen is absolutely untypical. Adding/ removing of an Slog should be troublefree on Open-ZFS.
On a powerloss or crash, all writes in the cache are lost. You can then enable sync write. This is an additional logging of last writes, think of it like a BBU on hardwareraid. As disks are quite slow with small random writes, performace can fall to a fraction of normal cached write performance.
This is where an Slog can help if it is optimised for small random writes . It must offer powerloss protection or it cannot guarantee last writes.
One of the cheapest SSDs that is really suited for an slog is an Intel S3700 (100 or 200GB).
see Top Picks for napp-it and OmniOS ZIL/ SLOG Drives
btw
have you modified sd.conf for the SSD or not?
The behaviour that you have seen is absolutely untypical. Adding/ removing of an Slog should be troublefree on Open-ZFS.