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Full Discussion: SAN/LVM question
Operating Systems Linux Red Hat SAN/LVM question Post 302534813 by mark54g on Tuesday 28th of June 2011 10:27:46 PM
Old 06-28-2011
My experience with MSA storage (which the P2000 is the next generation of) has not been stellar. I have had a tremendous amount of failures. Also, isn't the P2000 an arbitrated loop system? If you plan on chaining them together, that may mean downtime.

It's too bad you can't do something like use an IBM SVC in front of your storage, as it would make a lot of your issues go away.

I agree wholeheartedly with cjcox. Large file systems on low budgets are asking for problems. I would create a VG for each array and then create LVs for each "client" logging server.

Also, I would suggest at LEAST 1 hot spare in your groups, as losing a 2TB drive will degrade performance, since they are 7200rpm to begin with, but the time to rebuild RAID 5 should be considered. You are talking many hours. If you have a second failure during that time, data is gone.

Also, your 2TB drives are really 1.85TB, and each array you create is about 9TB in size. Carve up your LUNs and treat them as PVs, using a rather large extent size.

Do you have to keep the logs around full time? My suggestion would be to have your server keep the latest data in an uncompressed format and then archive it to compressed formats later on, or at least move them into other drives to keep your file systems smaller.
 

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LEARN ABOUT MOJAVE

ataraid

ATARAID(4)						   BSD Kernel Interfaces Manual 						ATARAID(4)

NAME

     ataraid -- ATA software RAID support

SYNOPSIS

     device ata
     device ataraid

DESCRIPTION

     The ataraid driver provides support for so-called software RAID (sometimes referred to as fake RAID or pseudo RAID).

     When a controller that supports software RAID is instructed to create a RAID array, its BIOS writes data structures in a specific metadata
     format to the disks.  These data structures are picked up by the ataraid driver, so that FreeBSD can work with the array.	The ataraid driver
     has to understand the specific metadata format of a controller BIOS in order to support its RAID capabilities.

     Read-only support for a metadata format means that FreeBSD can use the given RAID array for normal read/write operations.	Creation and
     rebuild of such arrays has to be done from the controller BIOS.

     Read and write support for a metadata format means that FreeBSD can use the given RAID array for normal read/write operations.  Additionally,
     the atacontrol(8) utility can be used to create, rebuild, update and fail such RAID arrays.

     The ataraid driver can read the following metadata formats:

     o	 Adaptec HostRAID
     o	 Highpoint V2 RocketRAID
     o	 Highpoint V3 RocketRAID
     o	 Intel MatrixRAID
     o	 Integrated Technology Express (ITE)
     o	 JMicron
     o	 LSI Logic V2 MegaRAID
     o	 LSI Logic V3 MegaRAID
     o	 NVIDIA MediaShield
     o	 Promise FastTrak
     o	 Silicon Image Medley
     o	 Silicon Integrated Systems (SiS)
     o	 VIA Tech V-RAID
     o	 FreeBSD PseudoRAID

     The ataraid driver can write the following metadata formats:

     o	 Highpoint V2 RocketRAID
     o	 Intel MatrixRAID
     o	 JMicron
     o	 Promise FastTrak
     o	 Silicon Integrated Systems (SiS)
     o	 VIA Tech V-RAID
     o	 FreeBSD PseudoRAID

     It is also possible to use software RAID on controllers that do not have special software RAID capabilities.  See atacontrol(8) for details.

FILES

     /dev/ar*  ATA RAID device nodes

SEE ALSO

     ata(4), atacontrol(8)

CAVEATS

     RAID5 is not supported at this time.  Code exists, but it neither uses nor maintains parity information.

AUTHORS

     The ataraid driver was written by Soren Schmidt <sos@FreeBSD.org>.  This manual page was written by Christian Brueffer
     <brueffer@FreeBSD.org>.

BSD
								 February 17, 2006							       BSD
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