Re: [CentOS] Suggest Hardware Raid Controller Card
John R Pierce wrote: On 07/11/11 6:10 PM, Christopher Chan wrote: Wait, wait. So using SSDs as FAST writing disks is a load of hogwash? You still need stuff like umem nvram cards? What's the deal with things like Fusion IO then? the high end enterprise SSDs have supercaps to give them time to flush their write buffers to flash in case of power failure events. but these drives are way more expensive than the $200 120GB stuff you'll find in the whitebox market. the whitebox stuff has fast writes because they buffer them, but in case of power failure with pending write operations, all bets are off on your data integrity. If I understood correctly, SSD's, even whitebox are good to place ext3/4 journaling files on keeping ext3/4 partitions on HDD's. Right? I would appreciate real-case scenario advice for cheaper drives, for home and small business applications. Thanks Ljubomir ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
From: Kaushal Shriyan kaushalshri...@gmail.com Yes I have setup RAID 1+0 Array using HP Smart Controller B110i BIOS. It shows usable disk space of approx 940 GB but the OS does not see it instead it shows all the 4 * 500 GB HDD. When you say It shows usable disk space of approx 940 GB, do you mean the array is 940 GB or the logical drive inside the array is 940GB? And I think on such controller you can have 2 logical drives max... JD ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On Tuesday, July 12, 2011 04:27 PM, Ljubomir Ljubojevic wrote: John R Pierce wrote: On 07/11/11 6:10 PM, Christopher Chan wrote: Wait, wait. So using SSDs as FAST writing disks is a load of hogwash? You still need stuff like umem nvram cards? What's the deal with things like Fusion IO then? the high end enterprise SSDs have supercaps to give them time to flush their write buffers to flash in case of power failure events. but these drives are way more expensive than the $200 120GB stuff you'll find in the whitebox market. the whitebox stuff has fast writes because they buffer them, but in case of power failure with pending write operations, all bets are off on your data integrity. If I understood correctly, SSD's, even whitebox are good to place ext3/4 journaling files on keeping ext3/4 partitions on HDD's. Right? I would appreciate real-case scenario advice for cheaper drives, for home and small business applications. Thanks Depends on the flash chips used. SLC flash is safer than MLC flash...but by how much I do not know. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
When you say It shows usable disk space of approx 940 GB, do you mean the array is 940 GB or the logical drive inside the array is 940GB? And I think on such controller you can have 2 logical drives max... On our IBM's it shows the size of the logical drive it presents to the OS. -- Drew Nothing in life is to be feared. It is only to be understood. --Marie Curie ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On Monday 11 July 2011 15:49, Kaushal Shriyan wrote: Hi, I have HP DL 180 G6 2U Server loaded with CentOS 5.6. Can someone please suggest any good Hardware Raid Controller Card for the mentioned Hardware and OS. The reason being this server comes with Onboard Sata Controller chipset (HP Smart Array B110i Controller). This server has SATA Harddrive - 4 Nos of 500GB each and the OS doesnot detect it. Have you set up the array using the disk setup utility? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On Mon, Jul 11, 2011 at 8:34 PM, Colin Coles co...@wemoto.com wrote: On Monday 11 July 2011 15:49, Kaushal Shriyan wrote: Hi, I have HP DL 180 G6 2U Server loaded with CentOS 5.6. Can someone please suggest any good Hardware Raid Controller Card for the mentioned Hardware and OS. The reason being this server comes with Onboard Sata Controller chipset (HP Smart Array B110i Controller). This server has SATA Harddrive - 4 Nos of 500GB each and the OS doesnot detect it. Have you set up the array using the disk setup utility? Hi, Yes I have setup RAID 1+0 Array using HP Smart Controller B110i BIOS. It shows usable disk space of approx 940 GB but the OS does not see it instead it shows all the 4 * 500 GB HDD. Regards, Kaushal ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
Kaushal Shriyan wrote: On Mon, Jul 11, 2011 at 8:34 PM, Colin Coles co...@wemoto.com wrote: On Monday 11 July 2011 15:49, Kaushal Shriyan wrote: Hi, I have HP DL 180 G6 2U Server loaded with CentOS 5.6. Can someone please suggest any good Hardware Raid Controller Card for the mentioned Hardware and OS. The reason being this server comes with Onboard Sata Controller chipset (HP Smart Array B110i Controller). This server has SATA Harddrive - 4 Nos of 500GB each and the OS doesnot detect it. Have you set up the array using the disk setup utility? Yes I have setup RAID 1+0 Array using HP Smart Controller B110i BIOS. It shows usable disk space of approx 940 GB but the OS does not see it instead it shows all the 4 * 500 GB HDD. If you go back into the bootup RAID firmware, does it show it that way? Was the RAID initialized? mark ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
At Mon, 11 Jul 2011 20:42:56 +0530 CentOS mailing list centos@centos.org wrote: On Mon, Jul 11, 2011 at 8:34 PM, Colin Coles co...@wemoto.com wrote: On Monday 11 July 2011 15:49, Kaushal Shriyan wrote: Hi, I have HP DL 180 G6 2U Server loaded with CentOS 5.6. Can someone please suggest any good Hardware Raid Controller Card for the mentioned Hardware and OS. The reason being this server comes with Onboard Sata Controller chipset (HP Smart Array B110i Controller). This server has SATA Harddrive - 4 Nos of 500GB each and the OS doesnot detect it. Have you set up the array using the disk setup utility? Hi, Yes I have setup RAID 1+0 Array using HP Smart Controller B110i BIOS. It shows usable disk space of approx 940 GB but the OS does not see it instead it shows all the 4 * 500 GB HDD. The HP Smart Array B110i Controller is not a real RAID controller it is A BIOS/Special driver based 'software RAID' (aka 'fakeraid'). You need a special driver (not included with RHEL/CentOS. You are actually better off disabling the RAID function of the HP Smart Array B110i Controller and configure it as a plain AHCI SATA controller and using the Linux software RAID (md raid) instead. A true hardware RAID controller would probably cost almost as much as the server itself. Just about all of the cheap (so called) SATA RAID controller cards are some flavor of fakeraid. A few are supported as DM Raid under Linux, but many are not. Regards, Kaushal ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Robert Heller -- 978-544-6933 / hel...@deepsoft.com Deepwoods Software-- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On Monday 11 July 2011 16:12, Kaushal Shriyan wrote: On Mon, Jul 11, 2011 at 8:34 PM, Colin Coles co...@wemoto.com wrote: On Monday 11 July 2011 15:49, Kaushal Shriyan wrote: Hi, I have HP DL 180 G6 2U Server loaded with CentOS 5.6. Can someone please suggest any good Hardware Raid Controller Card for the mentioned Hardware and OS. The reason being this server comes with Onboard Sata Controller chipset (HP Smart Array B110i Controller). This server has SATA Harddrive - 4 Nos of 500GB each and the OS doesnot detect it. Have you set up the array using the disk setup utility? Hi, Yes I have setup RAID 1+0 Array using HP Smart Controller B110i BIOS. It shows usable disk space of approx 940 GB but the OS does not see it instead it shows all the 4 * 500 GB HDD. Try discarding the array and rebuilding, perhaps using a different RAID level, see if that makes any difference. I have vaguely similar machines and have not encountered this type of problem, and I'm pretty sure all this range are certified for RHEL. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On 07/11/11 7:49 AM, Kaushal Shriyan wrote: 00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI Controller (prog-if 01 [AHCI 1.0]) that is an Intel ICH10 SATA controller, which is purely JBOD hardware, it supports Intel's 'Matrix' fake-raid. I highly recommend you use it in AHCI mode (thats a BIOS setting) and configure raid in linux with mdraid If you want harwdare raid in a DL180G6, you should have gotten one of the optional 'real' raid controllers such as the P410i w 1gb flash writeback cache. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
A true hardware RAID controller would probably cost almost as much as the server itself. Just about all of the cheap (so called) SATA RAID controller cards are some flavor of fakeraid. A few are supported as DM Raid under Linux, but many are not. Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true hardware RAID which I recently picked up *new* for $150. They don't do RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10. Where can you pickup a new server for $150? :-P -- Drew Nothing in life is to be feared. It is only to be understood. --Marie Curie ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On 07/11/11 9:30 AM, Drew wrote: Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true hardware RAID which I recently picked up*new* for $150. They don't do RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10. you want BBU (or flash-backed cache) if you want write-back cache, and not mandate write-through. This is quite independent of the RAID type. It greatly speeds up 'committed' random writes such as are generated by a transactional database. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true hardware RAID which I recently picked up*new* for $150. They don't do RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10. you want BBU (or flash-backed cache) if you want write-back cache, and not mandate write-through. This is quite independent of the RAID type. It greatly speeds up 'committed' random writes such as are generated by a transactional database. I stand corrected in that area. Tho, even upgrading to a LSI MegaRAID 9260 w/ BBU only brings you into the $1000 price range so unless you're buying $1000 pizza boxes from Supermicro (not knocking the brand, I use their kit at home ) that's still not even close to the price of a decently spec'd IBM or HP server. Of course our spec comes in around $6k per box. ;-) -- Drew Nothing in life is to be feared. It is only to be understood. --Marie Curie This started out as a hobby and spun horribly out of control. -Unknown MGen Dorlan Kwase UFPSFMC Deputy Judge Advocate General 9th MARDIV Commander, Ret. Obsidian Fleet ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On 07/11/11 9:53 AM, Drew wrote: I stand corrected in that area. Tho, even upgrading to a LSI MegaRAID 9260 w/ BBU only brings you into the $1000 price range so unless you're buying $1000 pizza boxes from Supermicro (not knocking the brand, I use their kit at home ) that's still not even close to the price of a decently spec'd IBM or HP server. Of course our spec comes in around $6k per box. ;-) I recently got some quotes on some HP DL servers, the HP p410 w/ 1GB flash-backed cache (no batteries to replace ever) PN 572532-B21 was MSRP $750 before any corporate discounts. this is a 8 channel 6gbps SAS controller (2 internal 4-channel connectors) my configuration also came to about $6K/box but that was a mighty powerful box (25 2.5 SAS bays, 12 core 2.8Ghz 48GB ram, and said raid controller) -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
- Original Message - From: John R Pierce pie...@hogranch.com To: centos@centos.org Sent: Tuesday, July 12, 2011 12:34 AM Subject: Re: [CentOS] Suggest Hardware Raid Controller Card On 07/11/11 9:30 AM, Drew wrote: Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true hardware RAID which I recently picked up*new* for $150. They don't do RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10. you want BBU (or flash-backed cache) if you want write-back cache, and not mandate write-through. This is quite independent of the RAID type. It greatly speeds up 'committed' random writes such as are generated by a transactional database. Who needs bbu when you can get an SSD to work with your ext3/ext4 that is sitting on an md raid 1/0/nested 1+0/10? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On 07/11/11 5:16 PM, Christopher Chan wrote: Who needs bbu when you can get an SSD to work with your ext3/ext4 that is sitting on an md raid 1/0/nested 1+0/10? lI hope your SSD isn't write buffering on commits. many (most?) consumer priced SSDs can corrupt file systems badly on power failures during active file allocation operations, and drop pending database writes on the floor. If an SSD doesn't do write buffering, its brutally slow relative to its read speeds. Only the more expensive enterprise drives have 'supercap' or other power backups for emergency buffer flushing in case of abrupt power shutdowns. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
- Original Message - From: John R Pierce pie...@hogranch.com To: centos@centos.org Sent: Tuesday, July 12, 2011 8:34 AM Subject: Re: [CentOS] Suggest Hardware Raid Controller Card On 07/11/11 5:16 PM, Christopher Chan wrote: Who needs bbu when you can get an SSD to work with your ext3/ext4 that is sitting on an md raid 1/0/nested 1+0/10? lI hope your SSD isn't write buffering on commits. many (most?) consumer priced SSDs can corrupt file systems badly on power failures during active file allocation operations, and drop pending database writes on the floor. If an SSD doesn't do write buffering, its brutally slow relative to its read speeds. Only the more expensive enterprise drives have 'supercap' or other power backups for emergency buffer flushing in case of abrupt power shutdowns. Wait, wait. So using SSDs as FAST writing disks is a load of hogwash? You still need stuff like umem nvram cards? What's the deal with things like Fusion IO then? ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Suggest Hardware Raid Controller Card
On 07/11/11 6:10 PM, Christopher Chan wrote: Wait, wait. So using SSDs as FAST writing disks is a load of hogwash? You still need stuff like umem nvram cards? What's the deal with things like Fusion IO then? the high end enterprise SSDs have supercaps to give them time to flush their write buffers to flash in case of power failure events. but these drives are way more expensive than the $200 120GB stuff you'll find in the whitebox market. the whitebox stuff has fast writes because they buffer them, but in case of power failure with pending write operations, all bets are off on your data integrity. -- john r pierceN 37, W 122 santa cruz ca mid-left coast ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
