Date: Thu, 6 Jun 2013 03:01:24 +0400 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Jeremy Chadwick <jdc@koitsu.org> Cc: freebsd-stable@freebsd.org Subject: Re: TRIM support through ciss Message-ID: <alpine.BSF.2.00.1306060257560.48048@woozle.rinet.ru> In-Reply-To: <20130605221636.GA21946@icarus.home.lan> References: <alpine.BSF.2.00.1306060157240.48048@woozle.rinet.ru> <20130605221636.GA21946@icarus.home.lan>
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On Wed, 5 Jun 2013, Jeremy Chadwick wrote: [snip a bit] > I assume this is you running stable/9 with r251419 or newer (which just > got committed a few hours ago)? Yes, sure, I missed to mention it explicitely. > I haven't looked at the code, but it is very, VERY important to remember > that you are *always* at the whim of 1) the controller driver (ciss(4) > in this case), and 2) the controller firmware, as to whether or not > certain pass-through commands are supported (in this case, since you > have a SAS controller, this would be accomplished via a SCSI command > that your controller does not support. I tried to chase versions, and it seems I use for this Proliant the last set. > Oh, it looks like Steve just replied and said more or less what I did. > :-) > > Bottom line as "we" (the royal we, I guess) have been saying for many > years now: any controller which operates in a RAID fashion and does not > support "true JBOD" (meaning the controller acts a generic controller > with no concept of RAID), will almost always get in the way. Instead, > stick with true non-RAID controllers -- and yes I am aware choices are > limited. well, the server in question "has been fallen from the heaven", ya know ;-) if I were the builder, I suppose I'd use SuperMicro platform + non-RAID LSI HBA... on the other hand, battery-backed cache... not an easy choice, yes. -- Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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