D'oh - I take that back. Upon re-reading, I expect that you weren't indicting MLC drives generally, just the JMicron-controlled ones. It looks like we aren't suffering from those, though.
-Gray On Thu, Jan 15, 2009 at 11:12 PM, Gray Carper <gcar...@umich.edu> wrote: > Hey there, Will! Thanks for the quick reply and the link. > > And: Oops! Yes - the SSD models would probably be useful information. ;> > The 32GB SSD is an Intel X-25E (SLC). The 80GB SSDs are Intel X-25M (MLC). > If MLC drives can be naughty, perhaps we should try an additional test: keep > the 80GB SSDs out of the chassis, but leave the 32GB SSD in. > > -Gray > > > On Thu, Jan 15, 2009 at 10:00 PM, Will Murnane <will.murn...@gmail.com>wrote: > >> On Thu, Jan 15, 2009 at 02:36, Gray Carper <gcar...@umich.edu> wrote: >> > In the third test, we rebuilt the ZFS pool with the ZIL on a 32GB SSD >> and >> > the L2ARC on four 80GB SSDs. >> An obvious question: what SSDs are these? Where did you get them? >> Many, many consumer-level MLC SSDs have controllers by JMicron (also >> known for their lousy sata controllers, BTW) which cause stalling of >> all I/O under certain fairly common conditions (see [1]). Spending >> the cash for an SLC drive (such as the Intel X-25S) may solve the >> problem. >> >> Will >> >> [1]: http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3403&p=8 >> > > > > -- > Gray Carper > MSIS Technical Services > University of Michigan Medical School > gcar...@umich.edu | skype: graycarper | 734.418.8506 > http://www.umms.med.umich.edu/msis/ > -- Gray Carper MSIS Technical Services University of Michigan Medical School gcar...@umich.edu | skype: graycarper | 734.418.8506 http://www.umms.med.umich.edu/msis/
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