[OpenIndiana-discuss] Good SLOG devices?
ijanmaat at xs4all.nl
Thu Mar 3 20:28:15 UTC 2011
So you still need enough throughput on the traditional hardisks to
handle all the writes from memory if I understand correctly.
matthew lagoe schreef:
> To be frank if you get 2 years of use out of a drive, while that's not a
> huge amount of time, its still quite good. Also in 2 years you will have
> SSD's that you can replace it with for next to nothing that will be even
> In regards to your 2nd question it is my understanding that the SLOG is
> written to so that the OS can return a "write complete". ZFS only does a
> write cycle once every 5 seconds, as such if you happened to lose power in
> that 5 seconds you would lose all that data. the SLOG basically buffers the
> writes to the SSD so in the event of power loss ect, the data is not lost
> and is read from and written to the zpool on startup.
> My numbers may not be exact above but the general idea is that rather then
> writing to the slower drives, it buffers the writes to the fast SSD then
> slowly writes to the zpool, making it so that especially small writes are
> still fast, as the OS returns a "write complete" before its written to the
> slow drives, while at the same time ensuring your data integrity with the
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