----- Original Message ----- > On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote: > > >> There is absolutely no sense in having slog devices larger than > >> then main memory, because it will never be used, right? > >> ZFS will rather flush the txg to disk than reading back from > >> zil? So there is a guideline to have enough slog to hold about 10 > >> seconds of zil, but the absolute maximum value is the size of > >> main memory. Is this correct? > > > > ZFS uses at most RAM/2 for ZIL > > It is good to keep in mind that only small writes go to the dedicated > slog. Large writes to to main store. A succession of that many small > writes (to fill RAM/2) is highly unlikely. Also, that the zil is not > read back unless the system is improperly shut down.
I thought all sync writes, meaning everything NFS and iSCSI, went into the slog - IIRC the docs says so. Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
