Dave Watkins wrote: > Excuse the top posting, I'm stuck on OWA :) > > There are still some additional benefits if you really need speed, and > they are the onboard memory hardware raid cards have, and the ability > to add a BBU so you can turn on write-back caching and geta nice speed > boost for doing it.
It'd be interesting to see some numbers of SAS RAID with cache and write-back vs softraid.... R. > > Dave > > ------------------------------------------------------------------------ > *From:* [EMAIL PROTECTED] on behalf of Rafiu > Fakunle > *Sent:* Sat 7/21/2007 3:13 p.m. > *To:* Dave Johnson > *Cc:* [email protected] > *Subject:* Re: [OF-users] Getting I2O RAID to work > > Dave Johnson wrote: > > i for one would like to start the trend of ceasing to call these > > "RAID" cards, since they aren't, > > Hear hear. > > > and instead calling them exactly what they are, > > Lemons! ;) > > > storage device controller cards with an integrated -but for all > > intents and purposes- outboard XOR Offload Engine (XOE). > > > > XOE (zo-wee) cards are notorious for failing on you at the most > > inopportune time. I 2nd Rafiu's recomendation to go with a complete > > RAID subsystem which includes XOE, storage device controller, and data > > transport IO processor all in one complete card. Or simply not use > > the XOE of the card and use only the storage controller portion, > > relying instead on the RAID support within the LVM2 component, which > > has been designed and vetted for safety by considerably more testing > > than Promise' 5 beta testers in Taiwan. > > > > That XOE can be a biotch ! =P > > > > You know, with the average CPU having at minimum 2 cores, the only > advantage to using a RAID controller these days - when you weigh > softraid against the management overhead of hardraid - is for the > hot-swap capability. Otherwise a decent SAS controller + MD RAID and > you're good to go. External RAID is a different matter of course, > especially when you get into the realm of shared storage. > > > R. > > > -=dave > > > > ----- Original Message ----- From: "Rafiu Fakunle" <[EMAIL PROTECTED]> > > To: "Jim Kusznir" <[EMAIL PROTECTED]> > > Cc: <[email protected]> > > Sent: Friday, July 20, 2007 3:48 PM > > Subject: Re: [OF-users] Getting I2O RAID to work > > > > > >> Jim Kusznir wrote: > >>> Hi all: > >>> > >>> After over a week of messing with OpenFiler, I think I'm finally close > >>> to getting my hardware I2O RAID card working (Promise SX6000). I had > >>> to upgrade the kernel, as the version shipping with OF has a bug in it > >>> that breaks all I2O RAID cards. I don't need iSCSI target for now, so > >>> I though tthis was acceptable. > >> > >> Don't use i2o cards ;) > >> > >> Stay away from anything named "Promise" or "Highpoint" if you want > OF to > >> play nice with the RAID Controller. > >> Cards we tend to play better with are: > >> > >> 1) 3Ware / AMCC > >> 2) Areca > >> 3) LSI Logic / Intel > >> 4) Adaptec > >> 5) ICP Vortex > >> > >>> > >>> Now that I have it showing up in my system, things are close. The > >>> problem is I2O raid devices are created in /dev/i2o/hd* (my case: > >>> /dev/i2o/hda -- this is NOT the same disk as my system disk: > >>> /dev/hda). So, under "Physical Volues", it does not see it, and thus > >>> I can't partition or use it. I have verified that the volume itself > >>> works by partitioning and formatting it directly. Both operations > >>> completed sucessfully, verifying the raid drivers funcitionality. > >>> > >>> So my question at this point is: how do I get OF to see the disk and > >>> be able to create volumes and such. Or, if I partition and set up LVM > >>> by hand, will it pick it up at that point? If so, what are its > >>> requirements to make it seen? > >> Here's a patch to /opt/openfiler/sbin/list-disks.pl > >> > >> --- list-disks.pl.orig 2007-07-20 15:18:22.000000000 -0700 > >> +++ list-disks.pl 2007-07-20 15:26:24.000000000 -0700 > >> @@ -123,6 +123,7 @@ > >> close(MEDIA); > >> if ($media =~ /^disk/ && !$_[0]) { > >> push(@devs, "/dev/hd$n"); > >> + push(@devs, "/dev/i2o/hd$n"); > >> } > >> } > >> } > >> > >> > >> > >> R. > >> _______________________________________________ > >> Openfiler-users mailing list > >> [email protected] > >> https://lists.openfiler.com/mailman/listinfo/openfiler-users > >> > > > > _______________________________________________ > > Openfiler-users mailing list > > [email protected] > > https://lists.openfiler.com/mailman/listinfo/openfiler-users > > _______________________________________________ > Openfiler-users mailing list > [email protected] > https://lists.openfiler.com/mailman/listinfo/openfiler-users > > ------------------------------------------------------------------------ > > _______________________________________________ > Openfiler-users mailing list > [email protected] > https://lists.openfiler.com/mailman/listinfo/openfiler-users > _______________________________________________ Openfiler-users mailing list [email protected] https://lists.openfiler.com/mailman/listinfo/openfiler-users
