Date: Sun, 30 Mar 2003 12:04:48 -0500 From: Mike Tancsa <mike@sentex.net> To: freebsd-hardware@freebsd.org Subject: Re: problem on 1TB filesystem RAID 5 3ware Message-ID: <8e8e8vou1b7rtvg4nih6g7h79lbrtpbstc@4ax.com> In-Reply-To: <Z8K0TB.A.ccW.Oifh-@coal.sentex.ca> References: <YKrfnB.A.egN.yEbg-@coal.sentex.ca> <YKrfnB.A.egN.yEbg-@coal.sentex.ca> <kchb8vgf6eksv203ec47b6848pvmv8o63u@4ax.com> <Z8K0TB.A.ccW.Oifh-@coal.sentex.ca>
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On Sat, 29 Mar 2003 13:48:15 -0600, in sentex.lists.freebsd.hardware you wrote: > >>There have been broken 3ware firmwares in the past that specifically >>effected RAID5. A quick test of the same hardware under LINUX or win2k >>would confirm if this is another firmware issue or driver specific. = Another >>common issue across all platforms (i.e. firmware issue) was changing = the >>disk stripe to anything other than the default 64k on RAID0 or 10. = This >>too would break things on all operating systems. > >We'd like to use the 3ware 7000-2 in non-RAID JBOD, to get the supposed=20 >speed benefit of the 3ware "switch fabric", lower CPU overhead, etc. in=20 >high-volume SMTP relays. > >Will whatever 3ware+FreeBSD somewhat "discutable" 3ware problems show up= in=20 >JBOD mode or are the problems limited to RAID? I have *many* 3ware cards deployed in FreeBSD in RAID1, one very large = news server with several RAID0 stripes (it blasts 25Mb/s onto the drives 24hrs= a day) running dnews with about 55 concurrent clients reading at peak = times) and a busy sql server in RAID10 with excellent results. I cant speak to RAID5 as I dont have any application for that configuration, nor JBOD. However, I have tested a pair of drives in RAID 1 vs the same drive on a regular ATA controller. Even in RAID1, the reads are faster as both spindles seem to be used in an intelligent way and we had no difference = in write speed with respect for the RAID5 issues, try "raid5, 3ware, corruption, linux" = on google... http://www.google.ca/search?q=3Dcache:DXp1yfuL5RwC:computing.fnal.gov/cms= /disk/performance/3ware/3Ware_CMS_Story.html+3ware+corruption+raid5&hl=3D= en&ie=3DUTF-8 >Does anybody have experience or URL that says the 3ware 7000-2 @ $100 is= =20 >sufficiently "better" to justify it over an Promise "Ultra133 TX2" @ = $40? as JBOD, I doubt you would see any significant difference. If you want RAID0,1 or 10, I highly recommend the 3ware. ---Mike Mike Tancsa (mike@sentex.net)=09 http://www.sentex.net/mike
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