Re: [zfs-discuss] ZFS on Dell with FreeBSD
On 28/10/2011 06:53, Albert Shih wrote: Le 27/10/2011 à 13:34:50-0400, David Magda a écrit On Thu, October 27, 2011 11:32, Albert Shih wrote: I also recommend LSI 9200-8E or new 9205-8E with the IT firmware based on past experience Do you known if the LSI-9205-8E HBA or the LSI-9202-16E HBA work under FreBSD 9.0 ? Check the man page for mpt(4): http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+9-current http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+8.2-RELEASE WellI don't find this LSI in the mpt driver. I find the chipset of the http://www.lsi.com/products/storagecomponents/Pages/LSISAS9202-16e.aspx in the mps drivers. But I don't known if it's enough to support le card. Or LSI's site: http://www.lsi.com/products/storagecomponents/Pages/LSISAS9205-8e.aspx this one use 2308 chip and I definitely don't find this chip on mps driver. http://www.lsi.com/products/storagecomponents/Pages/LSISAS9202-16e.aspx Do you know how to use a search engine? Don't knwon you tell me ;-) I going to spend lot of money to buy some card, I just hope I can sure the card going to work There is a fair chance for any newer LSI/PERC that supports sas it may be supported under the mfi driver. for example on dell R410 mfiutil -u0 show adapter mfi0 Adapter: Product Name: PERC H700 Adapter Serial Number: 0CP00UO Firmware: 12.10.0-0025 RAID Levels: JBOD, RAID0, RAID1, RAID5, RAID6, RAID10, RAID50 Battery Backup: present NVRAM: 32K Onboard Memory: 512M Minimum Stripe: 8k Maximum Stripe: 1M mfi0@pci0:3:0:0:class=0x010400 card=0x1f161028 chip=0x00791000 rev=0x05 hdr=0x00 vendor = 'LSI Logic / Symbios Logic' device = 'MegaRAID SAS 2108 [Liberator]' class = mass storage I am currently having some issues with a similar controller but thats a different firmware and rebadged by supermicro. so far i havent had any issues with this dell but its been under very light load and only up for a month. Vince Thanks Regards. JAS ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
Le 19/10/2011 à 19:23:26-0700, Rocky Shek a écrit Hi. Thanks for this information. I also recommend LSI 9200-8E or new 9205-8E with the IT firmware based on past experience Do you known if the LSI-9205-8E HBA or the LSI-9202-16E HBA work under FreBSD 9.0 ? Best regards. Regards. -- Albert SHIH DIO batiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 Heure local/Local time: jeu 27 oct 2011 17:20:11 CEST ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Thu, October 27, 2011 11:32, Albert Shih wrote: I also recommend LSI 9200-8E or new 9205-8E with the IT firmware based on past experience Do you known if the LSI-9205-8E HBA or the LSI-9202-16E HBA work under FreBSD 9.0 ? Check the man page for mpt(4): http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+9-current http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+8.2-RELEASE Or LSI's site: http://www.lsi.com/products/storagecomponents/Pages/LSISAS9205-8e.aspx http://www.lsi.com/products/storagecomponents/Pages/LSISAS9202-16e.aspx Do you know how to use a search engine? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
Le 27/10/2011 à 13:34:50-0400, David Magda a écrit On Thu, October 27, 2011 11:32, Albert Shih wrote: I also recommend LSI 9200-8E or new 9205-8E with the IT firmware based on past experience Do you known if the LSI-9205-8E HBA or the LSI-9202-16E HBA work under FreBSD 9.0 ? Check the man page for mpt(4): http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+9-current http://www.freebsd.org/cgi/man.cgi?query=mptmanpath=FreeBSD+8.2-RELEASE WellI don't find this LSI in the mpt driver. I find the chipset of the http://www.lsi.com/products/storagecomponents/Pages/LSISAS9202-16e.aspx in the mps drivers. But I don't known if it's enough to support le card. Or LSI's site: http://www.lsi.com/products/storagecomponents/Pages/LSISAS9205-8e.aspx this one use 2308 chip and I definitely don't find this chip on mps driver. http://www.lsi.com/products/storagecomponents/Pages/LSISAS9202-16e.aspx Do you know how to use a search engine? Don't knwon you tell me ;-) I going to spend lot of money to buy some card, I just hope I can sure the card going to work Thanks Regards. JAS -- Albert SHIH DIO batiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 Heure local/Local time: ven 28 oct 2011 07:48:55 CEST ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On 20 Oct 2011, at 05:24, Dennis Glatting free...@penx.com wrote: On Thu, 20 Oct 2011, Fajar A. Nugraha wrote: On Thu, Oct 20, 2011 at 7:56 AM, Dave Pooser dave@alfordmedia.com wrote: On 10/19/11 9:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server No, you need a card that includes 2 external x4 SFF8088 SAS connectors. I'd recommend an LSI SAS 9200-8e HBA flashed with the IT firmware-- then it presents the individual disks and ZFS can handle redundancy and recovery. Exactly, thanks for suggesting an exact controller model that can present disks as JBOD. With hardware RAID, you'd pretty much rely on the controller to behave nicely, which is why I suggested to simply create one big volume for zfs to use (so you pretty much only use features like snapshot, clones, etc, but don't use zfs self healing feature). Again, others might (and have) disagree and suggest using volumes for individual disk (even when you're still relying on hardware RAID controller). But ultimately there's no question that the best possible setup would be to present the disks as JBOD and let zfs handle it directly. I saw something interesting and different today, which I'll just throw out. A buddy has a HP370 loaded with disks (not the only machine that provides these services, rather the one he was showing off). The 370's disks are managed by the underlying hardware RAID controller, which he built as multiple RAID1 volumes. ESXi 5.0 is loaded and in control of the volumes, some of which are partitioned. Consequently, his result is vendor supported interfaces between disks, RAID controller, ESXi, and managing/reporting software. The HP370 has multiple FreeNAS instances whose disks are the disks (volumes/partitions) from ESXi (all on the same physical hardware). The FreeNAS instances are partitioned according to their physical and logical function within the infrastructure, whether by physical or logical connections. The FreeNAS instances then serves its disks to consumers. We have not done any performance testing. Generally, his NAS consumers are not I/O pigs though we want the best performance possible (some consumers are over the WAN resulting in any HP/ESXi/FreeNAS performance issues possibly moot). (I want to do some performance testing because, well, it may have significant amusement value.) A question we have is whether ZFS (ARC, maybe L2ARC) within FreeNAS is possible or would provide any value. Possible, yes. Provides value, somewhat. You still get to use snapshots, compression, dedup... You don't get ZFS self healing though which IMO is a big loss. Regarding the ARC, it totally depends on the kind of files you serve and the amount of RAM you have available. If you keep serving huge, different files all the time, it won't help as much as when clients request the same small/avg files over and over again.___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
Le 19/10/2011 à 21:30:31+0700, Fajar A. Nugraha a écrit Sorry to cross-posting. I don't knwon which mailing-list I should post this message. I'll would like to use FreeBSD with ZFS on some Dell server with some MD1200 (classique DAS). When we buy a MD1200 we need a RAID PERC H800 card on the server so we have two options : 1/ create a LV on the PERC H800 so the server see one volume and put the zpool on this unique volume and let the hardware manage the raid. 2/ create 12 LV on the perc H800 (so without raid) and let FreeBSD and ZFS manage the raid. which one is the best solution ? Neither. The best solution is to find a controller which can pass the disk as JBOD (not encapsulated as virtual disk). Failing that, I'd go with (1) (though others might disagree). Thanks. That's going to be very complicate...but I'm going to try. Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) The more the better :) Well, my employer is not so rich. It's first time I'm going to use ZFS on FreeBSD on production (I use on my laptop but that's mean nothing), so what's in your opinion the minimum ram I need ? Is something like 48 Go is enough ? Just make sure do NOT use dedup untul you REALLY know what you're doing (which usually means buying lots of RAM and SSD for L2ARC). Ok. Regards. JAS -- Albert SHIH DIO batiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 Heure local/Local time: jeu 20 oct 2011 11:30:49 CEST ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Thu, Oct 20, 2011 at 4:33 PM, Albert Shih albert.s...@obspm.fr wrote: Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) The more the better :) Well, my employer is not so rich. It's first time I'm going to use ZFS on FreeBSD on production (I use on my laptop but that's mean nothing), so what's in your opinion the minimum ram I need ? Is something like 48 Go is enough ? If you don't use dedup (recommended), should be more than enough. If you use dedup, search zfs-discuss archive for some calculation method posted. For comparison purposes, you could also look at Oracle's zfs storage appliance configuration: https://shop.oracle.com/pls/ostore/f?p=dstore:product:3479784507256153::NO:RP,6:P6_LPI,P6_PROD_HIER_ID:424445158091311922637762,114303924177622138569448 -- Fajar ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
Le 19/10/2011 à 10:52:07-0400, Krunal Desai a écrit On Wed, Oct 19, 2011 at 10:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server so we have two options : 1/ create a LV on the PERC H800 so the server see one volume and put the zpool on this unique volume and let the hardware manage the raid. 2/ create 12 LV on the perc H800 (so without raid) and let FreeBSD and ZFS manage the raid. which one is the best solution ? Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) I know the PERC H200 can be flashed with IT firmware, making it in effect a dumb HBA perfect for ZFS usage. Perhaps the H800 has the same? (If not, can you get the machine configured with a H200?) I'm not sure what you mean when you say «H200 flashed with IT firmware» ? If that's not an option, I think Option 2 will work. My first ZFS server ran on a PERC 5/i, and I was forced to make 8 single-drive RAID 0s in the PERC Option ROM, but Solaris did not seem to mind that. OK. I don't have choice (too complexe to explain and it's meanless here) but I can only buy at Dell at this moment. On the Dell website I've the choice between : SAS 6Gbps External Controller PERC H800 RAID Adapter for External JBOD, 512MB Cache, PCIe PERC H800 RAID Adapter for External JBOD, 512MB NV Cache, PCIe PERC H800 RAID Adapter for External JBOD, 1GB NV Cache, PCIe PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 256MB Cache PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 512MB Cache LSI2032 SCSI Internal PCIe Controller Card I've no idea what's the first thing is. But what I understand the best solution is the first or the last ? Regards. JAS -- Albert SHIH DIO batiment 15 Observatoire de Paris 5 Place Jules Janssen 92195 Meudon Cedex Téléphone : 01 45 07 76 26/06 86 69 95 71 Heure local/Local time: jeu 20 oct 2011 11:44:39 CEST ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On 10/20/11 11:49 AM, Albert Shih wrote: Le 19/10/2011 à 10:52:07-0400, Krunal Desai a écrit On Wed, Oct 19, 2011 at 10:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server so we have two options : 1/ create a LV on the PERC H800 so the server see one volume and put the zpool on this unique volume and let the hardware manage the raid. 2/ create 12 LV on the perc H800 (so without raid) and let FreeBSD and ZFS manage the raid. which one is the best solution ? Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) I know the PERC H200 can be flashed with IT firmware, making it in effect a dumb HBA perfect for ZFS usage. Perhaps the H800 has the same? (If not, can you get the machine configured with a H200?) I'm not sure what you mean when you say «H200 flashed with IT firmware» ? If that's not an option, I think Option 2 will work. My first ZFS server ran on a PERC 5/i, and I was forced to make 8 single-drive RAID 0s in the PERC Option ROM, but Solaris did not seem to mind that. OK. I don't have choice (too complexe to explain and it's meanless here) but I can only buy at Dell at this moment. On the Dell website I've the choice between : SAS 6Gbps External Controller PERC H800 RAID Adapter for External JBOD, 512MB Cache, PCIe PERC H800 RAID Adapter for External JBOD, 512MB NV Cache, PCIe PERC H800 RAID Adapter for External JBOD, 1GB NV Cache, PCIe PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 256MB Cache PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 512MB Cache LSI2032 SCSI Internal PCIe Controller Card I've no idea what's the first thing is. But what I understand the best solution is the first or the last ? Regards. JAS The best solution is to get a dumb HBA which will present your drives directly to the OS (JBOD), then create your ZFS pools there. Many people have already recommended LSI because it's widely used on the list. Also, what do they mean by SAS 6Gbps External Controller ? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
Hi-- On Oct 20, 2011, at 2:57 AM, Damien Fleuriot wrote: Also, what do they mean by SAS 6Gbps External Controller ? SAS is serial attached SCSI; it permits multipath connections to devices and thus is more similar to fibre channel HBAs than SATA, although some SAS controllers will also work with normal SATA drives. Regards, -- -Chuck ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On 10/20/11 6:52 PM, Chuck Swiger wrote: Hi-- On Oct 20, 2011, at 2:57 AM, Damien Fleuriot wrote: Also, what do they mean by SAS 6Gbps External Controller ? SAS is serial attached SCSI; it permits multipath connections to devices and thus is more similar to fibre channel HBAs than SATA, although some SAS controllers will also work with normal SATA drives. Regards, I know what SAS stands for. My question was, what do they mean by *external* controller ? Do you get to provide your own ? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Oct 20, 2011, at 9:59 AM, Damien Fleuriot wrote: SAS is serial attached SCSI; it permits multipath connections to devices and thus is more similar to fibre channel HBAs than SATA, although some SAS controllers will also work with normal SATA drives. I know what SAS stands for. OK. My question was, what do they mean by *external* controller ? It means the connections to the devices are external, rather than being intended for internal devices: http://www.dell.com/content/topics/topic.aspx/global/products/pvaul/topics/en/us/raid_controller?c=usl=encs=555 Do you get to provide your own ? Devices? Yes. Regards, -- -Chuck ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Thu, Oct 20, 2011 at 5:49 AM, Albert Shih albert.s...@obspm.fr wrote: I'm not sure what you mean when you say «H200 flashed with IT firmware» ? IT is Initiator Target, and many LSI chips have a version of their firmware available that will put them into this mode, which is desirable for ZFS. This is opposed to other LSI firmware modes like IR which is RAID, I believe. (which you do not want). Since the H200 uses a LSI chip, you can download that firmware from LSI and flash it to the card turning it into an IT-mode card and a simple HBA. --khd ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On the Dell website I've the choice between : SAS 6Gbps External Controller PERC H800 RAID Adapter for External JBOD, 512MB Cache, PCIe PERC H800 RAID Adapter for External JBOD, 512MB NV Cache, PCIe PERC H800 RAID Adapter for External JBOD, 1GB NV Cache, PCIe PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 256MB Cache PERC 6/E SAS RAID Controller, 2x4 Connectors, External, PCIe 512MB Cache LSI2032 SCSI Internal PCIe Controller Card The first one probably is a LSI card. However check with DELL (and if it is LSI, check what card exactly). And check if with that controller they support seeing all individual drives in the chassis as JBOD. Otherwise consider buying the chassis without the controller and get just the LSI from someone else. Regards, JP___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Wed, Oct 19, 2011 at 9:14 PM, Albert Shih albert.s...@obspm.fr wrote: Hi Sorry to cross-posting. I don't knwon which mailing-list I should post this message. I'll would like to use FreeBSD with ZFS on some Dell server with some MD1200 (classique DAS). When we buy a MD1200 we need a RAID PERC H800 card on the server so we have two options : 1/ create a LV on the PERC H800 so the server see one volume and put the zpool on this unique volume and let the hardware manage the raid. 2/ create 12 LV on the perc H800 (so without raid) and let FreeBSD and ZFS manage the raid. which one is the best solution ? Neither. The best solution is to find a controller which can pass the disk as JBOD (not encapsulated as virtual disk). Failing that, I'd go with (1) (though others might disagree). Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) The more the better :) Just make sure do NOT use dedup untul you REALLY know what you're doing (which usually means buying lots of RAM and SSD for L2ARC). -- Fajar ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Wed, Oct 19, 2011 at 10:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server so we have two options : 1/ create a LV on the PERC H800 so the server see one volume and put the zpool on this unique volume and let the hardware manage the raid. 2/ create 12 LV on the perc H800 (so without raid) and let FreeBSD and ZFS manage the raid. which one is the best solution ? Any advise about the RAM I need on the server (actually one MD1200 so 12x2To disk) I know the PERC H200 can be flashed with IT firmware, making it in effect a dumb HBA perfect for ZFS usage. Perhaps the H800 has the same? (If not, can you get the machine configured with a H200?) If that's not an option, I think Option 2 will work. My first ZFS server ran on a PERC 5/i, and I was forced to make 8 single-drive RAID 0s in the PERC Option ROM, but Solaris did not seem to mind that. --khd ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On 10/19/11 9:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server No, you need a card that includes 2 external x4 SFF8088 SAS connectors. I'd recommend an LSI SAS 9200-8e HBA flashed with the IT firmware-- then it presents the individual disks and ZFS can handle redundancy and recovery. -- Dave Pooser Manager of Information Services Alford Media http://www.alfordmedia.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
RE: [zfs-discuss] ZFS on Dell with FreeBSD
I also recommend LSI 9200-8E or new 9205-8E with the IT firmware based on past experience Also LSI Original HBA normally released FW earlier than OEM. Plus, most of users in community use LSI HBA. Rocky -Original Message- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Dave Pooser Sent: Wednesday, October 19, 2011 5:56 PM To: freebsd-questions@freebsd.org; zfs-disc...@opensolaris.org Subject: Re: [zfs-discuss] ZFS on Dell with FreeBSD On 10/19/11 9:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server No, you need a card that includes 2 external x4 SFF8088 SAS connectors. I'd recommend an LSI SAS 9200-8e HBA flashed with the IT firmware-- then it presents the individual disks and ZFS can handle redundancy and recovery. -- Dave Pooser Manager of Information Services Alford Media http://www.alfordmedia.com ___ zfs-discuss mailing list zfs-disc...@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: [zfs-discuss] ZFS on Dell with FreeBSD
On Thu, Oct 20, 2011 at 7:56 AM, Dave Pooser dave@alfordmedia.com wrote: On 10/19/11 9:14 AM, Albert Shih albert.s...@obspm.fr wrote: When we buy a MD1200 we need a RAID PERC H800 card on the server No, you need a card that includes 2 external x4 SFF8088 SAS connectors. I'd recommend an LSI SAS 9200-8e HBA flashed with the IT firmware-- then it presents the individual disks and ZFS can handle redundancy and recovery. Exactly, thanks for suggesting an exact controller model that can present disks as JBOD. With hardware RAID, you'd pretty much rely on the controller to behave nicely, which is why I suggested to simply create one big volume for zfs to use (so you pretty much only use features like snapshot, clones, etc, but don't use zfs self healing feature). Again, others might (and have) disagree and suggest using volumes for individual disk (even when you're still relying on hardware RAID controller). But ultimately there's no question that the best possible setup would be to present the disks as JBOD and let zfs handle it directly. -- Fajar ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
