HP d2x00 SAS Storage usage

The most recent project to do Blade server is to use HP D2600 SAS storage. Although it is very simple storage, but because the price is much lower than the P4x00 series SAN storage, it should be said that the scope of use is relatively broad. Of course, some people say this is not comparable, for large enterprises, I fully agree. But for ordinary small and medium-sized enterprises, P4X00 series is a standard SAN, the price is indeed a little expensive, and small and medium-sized applications are usually not too complex, various requirements are not so high. Anyway, in this record some of the d2x00 to see the learned, p4x00 later.

D2600,D2700 's homepage http://h10010.www1.hp.com/wwpc/us/en/sm/WF25a/12169-304616-3930445-3930445-3930445-3954787.html?dnr=1

The d2x00 series SAS 6G external disk storage is available in two sizes, both of which are 2U high. D2600 uses a 3.5-inch hard drive (LFF) with a maximum of 12 hard drives. D2700, use 2.5-inch hard drive (SFF), maximum 25 hard drives. provides two I/O modules, two SAS interfaces per module, connecting hosts and storage with a dedicated cable with Mini-sas connectors, and cascading between storage. D2600 each SAS port can be stacked up to 4 d2600,d2700 each SAS port can be stacked up to 2 D2700.

There are several ways to use
1. Single domain: There is only one connection path from host to disk cabinet, that is, only one I/O module is used.
2. Dual domain: There are two connection paths from the disk cabinet to host, that is, two I/O modules are used. This usage provides full redundancy, any single point of the SAS cable, I/O module, Power module failure will not affect the operation. But in this case, a dual-port hard drive is required
3. Server attached (single domain or dual domain) is connected to a RAID card on a Server from the disk cabinet, and only a partial RAID card is supported. Dual domain connection, you need to use the HP p411,p812, P421 Smart array card. The p711m SA card is required to connect to the blade server.
4. The Controller enclosure attached (single domain or dual domain) disk is connected to a rack RAID card cabinet before connecting to the server or network. Similarly, only a partial RAID card is supported

Because there are two I/O modules and a total of 4 SAS interfaces, and support cascading, there can be many kinds of cable connection methods, some can provide the best performance, some can provide the best redundancy, not all aspects of the best connection method, on-demand choice, User Guide document on the diagram.

Usage considerations
1. The hard drive power button does not completely power off, with the button power off, there are some components charged. Unplug the power cord if you want to completely power off.
2. When you insert a hard disk, you should always use the slot with the lowest slot number first.
3. SAS and SATA hard drives can be mixed in the same enclosure, but not in the same raid volume.
4. For good ventilation and cooling, the space slot should also be inserted with the bulkhead.

6Gb SAS BL switch on HP c7000. Use the embedded VSM (Virtual SAS Manager) Web tool or command-line tool to group the hard drives in the D2x00 series and make them raid by using the p711m SA card to assign the raid to the specified blade. This raid hard drive becomes the local hard drive for this blade. If there is a host or blade to the d2x00 on the dual path, if the d2x00 is a SAS hard drive, then the blade to the hard disk access between two paths is load balancing and failover. Http://h18000.www1.hp.com/products/quickspecs/13960_na/13960_na.html

The p711m RAID card, a mezzanine card (mezzanine card, which can be understood as a single child), connects to the 6GB SAS BL switch module via c3000 or c7000 high speed backplane, supporting shared or direct-attached SAS storage. Maximum support for 108 grouped SAS or SATA hard drives. When using a grouped, direct-attached storage SAS hard drive, dual-path load balancing and failover is supported in the D2X00 series dual domain connection. Http://h18004.www1.hp.com/products/quickspecs/14035_na/14035_na.html