Welcome toChina Server Net
About us | Add to Favorites | Contact us | 中文版
IBM DS4800 memory expands two kinds of means reach ark connective give typical e
From;    Author:Stand originally
Memory of one.IBM DS4800 is patulous ark connective two kinds of means

IBM DS4800 memory has two kinds of means to add patulous ark. Should add patulous ark while, added a new driver annulus way (Drive Loop Pairs) , we are called transverse expand (Horizontal Scaling) . Contrarily, should add patulous ark to already on some driver annulus roads, we are called fore-and-aft and patulous (Vertical Scaling) .

Should undertake transverse and patulous when, try to distributing patulous ark to all driver annulus roads as far as possible, make expand ark maintains the balance on the amount on each driver annulus roads. Additional, maintain LUNs as far as possible distributinging also is transverse, can match with the distributinging photograph of patulous ark so.

Fore-and-aft and patulous may appear lopsided case. For example: If you use two annulus means only (like DS4500) and add 8 EXP710s to each annulus road, you will cannot realize best configuration through expanding. What also can cooperate EXP710 through fore-and-aft distributinging LUNs is patulous. Two kinds of patulous mode have corresponding advantage:

The advantage with transverse and patulous 1.

·The biggest usability – distributings LUNs on average as far as possible on road of 4 driver annulus, is not 2 annulus road.
·The biggest bandwidth – allows comprehensive distributinging LUNs (LUNs to use consist in the HDDs) on road of 4 driver annulus, use thereby can amount to most 3, the bandwidth of 200 MB/sec (the biggest bandwidth of road of every driver annulus is 800 MB/sec) .

The advantage with fore-and-aft and patulous 2.

·Exclusive (Dedicated) bandwidth – puts LUNs on road of a driver annulus, ensure they are had can arrive most the bandwidth of 800 MB/sec. If you distributing a LUN in all Drive Loops, criterion this LUN must be contended for with other LUNs grab bandwidth. This may build those who become property to drop, however, this meeting is mixed according to your environment of working load differ and have change.

·The mixture environment that optimizes favourable geographical position to use 2/4 Gbps - the bandwidth that DS4800 can support different driver annulus way to have 2 Gbps or 4 Gbps severally. This will allow you to be able to use the technology of newest 4 Gbps, but also can upgrade the environment of compatible client's existing 2 Gbps. Below this kind of case, had better cross yours the rate with the LUNs same park of patulous ark. So, mix in have the 2 environments with 4 Gbps, transverse and patulous not be a recommended way.

Way of every driver annulus is right (Per Loop Pair) the bandwidth that has 800 MB/sec is the biggest bandwidth below the environment that points to complete 4 Gbps, this means you to must use 4 Gbps HDDs, 4 Gbps EXP Units, with 4 Gbps SFPs, if you do not have the component that uses complete 4 Gbps, the bandwidth of DS4800 can work to fall in the rate mode of package of rate of the lowest in all component only. Because DS4800 supports the link of 2 Gbps and 4 Gbps only, do not support the link of 1 Gbps, the working rate that blends component so is 2 Gbps. Be opposite in road of a driver annulus in, had better use the hard disk of a kind of rate only, namely 2 Gb HDDs or 4 Gb HDDs.
Previous12 Next