On Mar 6, 2010, at 9:31 PM, Abdullah Al-Dahlawi wrote: > Hi ALL > > I might be little bit confused !!! > > I will try to ask my question in a simple way ... > > Why would a 16GB L2ARC device got filled by running a benchmark that uses a > 2GB workingset while having a 2GB ARC max ?????
ZFS is COW, so if you are writing then the changes are cached. -- richard > > I know I am missing something here !!!!! > > Thanks > > > On Sun, Mar 7, 2010 at 12:05 AM, Richard Elling <richard.ell...@gmail.com> > wrote: > On Mar 6, 2010, at 8:05 PM, Eric D. Mudama wrote: > > On Sat, Mar 6 at 15:04, Richard Elling wrote: > >> On Mar 6, 2010, at 2:42 PM, Eric D. Mudama wrote: > >>> On Sat, Mar 6 at 3:15, Abdullah Al-Dahlawi wrote: > >>>> > >>>> hdd ONLINE 0 0 0 > >>>> c7t0d0p3 ONLINE 0 0 0 > >>>> > >>>> rpool ONLINE 0 0 0 > >>>> c7t0d0s0 ONLINE 0 0 0 > >>> > >>> I trimmed your zpool status output a bit. > >>> > >>> Are those two the same device? I'm barely familiar with solaris > >>> partitioning and labels... what's the difference between a slice and a > >>> partition? > >> > >> In this context, "partition" is an fdisk partition and "slice" is a > >> SMI or EFI labeled slice. The SMI or EFI labeling tools (format, > >> prtvtoc, and ftmhard) do not work on partitions. So when you > >> choose to use ZFS on a partition, you have no tools other than > >> fdisk to manage the space. This can lead to confusion... a bad > >> thing. > > > > So in that context, is the above 'zpool status' snippet a "bad thing > > to do"? > > If the partition containing c7t0d0s0 was p3, then it could be exceedingly > bad. Normally, if you try to create a zpool on a slice which already has a > zpool, then you will get an error message to that effect, which you can > override with the "-f" flag. However, that checking is done on slices, not > fdisk partitions. Hence, there is an opportunity for confusion... a bad thing. > -- richard > > ZFS storage and performance consulting at http://www.RichardElling.com > ZFS training on deduplication, NexentaStor, and NAS performance > http://nexenta-atlanta.eventbrite.com (March 16-18, 2010) > > > > > > > > -- > Abdullah Al-Dahlawi > PhD Candidate > George Washington University > Department. Of Electrical & Computer Engineering > ---- > Check The Fastest 500 Super Computers Worldwide > http://www.top500.org/list/2009/11/100 ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance http://nexenta-atlanta.eventbrite.com (March 16-18, 2010) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
