---------- Forwarded message ---------- From: Al Hopper <a...@logical-approach.com> Date: Sat, Sep 19, 2009 at 5:55 PM Subject: Re: [zfs-discuss] ZFS & HW RAID To: Scott Lawson <scott.law...@manukau.ac.nz>
On Fri, Sep 18, 2009 at 4:38 PM, Scott Lawson <scott.law...@manukau.ac.nz>wrote: ..... snip ...... > > Sun Directory Environment: > The directory team is running HP DL385 G2, which also has a built-in HW > RAID controller for 5 internal SAS disks. The team currently has DS5.2 > deployed on RHEL3, but as we move to DS6.3.1, they may want to move to > Solaris 10. We have an opportunity to move to ZFS in this environment, but > am curious how to best leverage ZFS capabilities in this scenario. JBOD is > very clear, but a lot of manufacturers out there are still offering HW RAID > technologies, with high-speed caches. Using ZFS with these is not very clear > to me, and as I mentioned, there are very mixed reviews, not on ZFS > features, but how it’s used in HW RAID settings. > > Sun Directory environment generally isn't very IO intensive, except for in > massive data reloads or indexing operations. Other than this it is an ideal > candidate for ZFS > and it's rather nice ARC cache. Memory is cheap on a lot of boxes and it > will make read only type file systems fly. I imagine your actual living LDAP > data set on disk > probably won't be larger than 10 Gigs or so? I have around 400K objects in > mine and it's only about 2 Gigs or so including all our indexes. I tend to > tune DS up > so that everything it needs is in RAM anyway. As far as diectory server > goes, are you using the 64 bit version on Linux? If not you should be as > well. > It would make sense IMHO to spend your budget on enterprise grade SSDs for this use case than to use EMC based storage. Imagine a 3-way or 4-way mirror of SSDs and the I/O Ops/Sec you'd get for it!! Bear in mind that Intel will soon release their 2nd generation "E" series SSD products - which is based on SLC flash. I know that politics may get in the way - but for certain workloads, the price/performance of EMC is difficult to justify IMHO. Thanks for any observations. > > Lloyd > > ------------------------------ > > _______________________________________________ > zfs-discuss mailing > listzfs-disc...@opensolaris.orghttp://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > > -- > _________________________________________________________________________ > > Scott Lawson > Systems Architect > Information Communication Technology Services > > Manukau Institute of Technology > Private Bag 94006 > South Auckland Mail Centre > Manukau 2240 > Auckland > New Zealand > > Phone : +64 09 968 7611 > Fax : +64 09 968 7641 > Mobile : +64 27 568 7611 > mailto:sc...@manukau.ac.nz <sc...@manukau.ac.nz> > http://www.manukau.ac.nz > > __________________________________________________________________________ > > perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);' > > __________________________________________________________________________ > > > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > -- Al Hopper Logical Approach Inc,Plano,TX a...@logical-approach.com Voice: 972.379.2133 Timezone: US CDT OpenSolaris Governing Board (OGB) Member - Apr 2005 to Mar 2007 http://www.opensolaris.org/os/community/ogb/ogb_2005-2007/ -- Al Hopper Logical Approach Inc,Plano,TX a...@logical-approach.com Voice: 972.379.2133 Timezone: US CDT OpenSolaris Governing Board (OGB) Member - Apr 2005 to Mar 2007 http://www.opensolaris.org/os/community/ogb/ogb_2005-2007/
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
