On 06 May, 2010 - Bob Friesenhahn sent me these 0,6K bytes: > On Wed, 5 May 2010, Edward Ned Harvey wrote: >> >> In the L2ARC (cache) there is no ability to mirror, because cache device >> removal has always been supported. You can't mirror a cache device, because >> you don't need it. > > How do you know that I don't need it? The ability seems useful to me.
The gain is quite minimal.. If the first device fails (which doesn't happen too often I hope), then it will be read from the normal pool once and then stored in ARC/L2ARC again. It just behaves like a cache miss for that specific block... If this happens often enough to become a performance problem, then you should throw away that L2ARC device because it's broken beyond usability. /Tomas -- Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
