[email protected] wrote: > I noticed alot of this where the pool members had no activity > according to iostat, but the ssd being used heavily. I don't really > understand, but can someone give me some insight into this?
The SSD doing SLOG (ZIL) is recording all the synchronous writes as they come in and then returning the "ok" to the calling process. Meanwhile, the write transactions are queuing up in memory (a "transaction group", txg) waiting to be flushed to physical disk (a "txg sync") every 30 seconds. If you watch iostat for a while, you should see almost constant activity to the SLOG disk and then a big burst of write IO approx every 30 seconds; possibly more frequently depending on how fast your writing data into memory. benr. _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
