Date: Sat, 31 Mar 2012 08:53:18 +1100 From: Jan Mikkelsen <janm@transactionware.com> To: Doug Ambrisko <ambrisko@ambrisko.com> Cc: freebsd-stable@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: LSI MegaRAID SAS 9240 with mfi driver? Message-ID: <7B722CC7-6D84-48A5-811A-4616191ECC96@transactionware.com> In-Reply-To: <201203301414.q2UEEiNb078707@ambrisko.com> References: <201203301414.q2UEEiNb078707@ambrisko.com>
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Hi, On 31/03/2012, at 1:14 AM, Doug Ambrisko wrote: > John Baldwin writes: > | On Friday, March 30, 2012 12:06:40 am Jan Mikkelsen wrote: > | ... > | > Is this path likely to work out? Any suggestions on where to go = from here? > |=20 > | You should try the updated mfi(4) driver that Doug (cc'd) is going = to soon > | merge into HEAD. It syncs up with the mfi(4) driver on LSI's = website which > | supports several cards that the current mfi(4) driver does not. = (I'm not > | fully sure if the 9240 is in that group or not. Doug might know = however.) >=20 > Yes, this card is supported with the mfi(4) in projects/head_mfi. = Looks > like we fixed a couple of last minute found bugs when trying to create = a > RAID wth mfiutil. This should be fixed now. I'm going to start the > merge to -current today. The version in head_mfi can run on older > versions of FreeBSD with the changes that Sean did. >=20 > Note that I wouldn't recomend the 9240 since it can't have a battery > option. NVRAM is the key to the speed of mfi(4) cards. However, that > won't stop us from supporting=20 Thanks. I don't know what changes Sean did. Are they in 9.0-release, or do I = need -stable after a certain point? I'm assuming I should be able to = take src/sys/dev/mfi/... and src/usr.sbin/mfiutil/... from -current. The performance is an interesting thing. The write performance I care = about is ZFS raidz2 with 6 x JBOD disks (or 6 x single disk raid0) on = this controller. The 9261 with a BBU performs well but obviously costs = more. I can see the BBU being important for controller based raid5, but I'm = hoping that ZFS with JBOD will still perform well. I'm ignorant at this = point, so that's why I'm trying it out. Do you have any experience or = expectations with a 9240 being used in a setup like that? Regards, Jan.
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