1. An ink jet recording medium comprising a substrate and an ink receiving layer which is provided on at least one surface of the substrate and contains inorganic fine particles having an average secondary particle size of 1 \u03bcm or more and 4 \u03bcm or less as measured by a Coulter counter method in an amount of 0.2 gm2 or more and 2.0 gm2 or less in terms of solid content mass,
wherein the ink receiving layer satisfies the following conditions (1) to (3) with respect to a pore distribution curve as determined by a nitrogen adsorption method,
(1) total pore volume in a pore size range of 10 nm or more and 30 nm or less is 0.25 mlg or more,
(2) total pore volume in a pore size range of 30 nm or more and 70 nm or less is 0.1 mlg or more, and
(3) volume ratio of the total pore volume in the pore size range of 10 nm or more and 30 nm or less to the total pore volume in the pore size range of 30 nm or more and 70 nm or less is within a range of from 1:0.4 to 1:1.
2. The ink jet recording medium according to claim 1, wherein inorganic fine particles satisfying the following conditions (4) to (6) with respect to a pore distribution curve of the inorganic fine particles as determined by the nitrogen adsorption method are used as the inorganic fine particles,
(4) total pore volume in a pore size range of 10 nm or more and 30 nm or less is 1 mlg or more,
(5) total pore volume in a pore size range of 30 nm or more and 70 nm or less is 0.1 mlg or more, and
(6) volume ratio of the total pore volume in the pore size range of 10 nm or more and 30 nm or less to the total pore volume in the pore size range of 30 nm or more and 70 nm or less is within a range of from 1:0.1 to 1:1.
3. The ink jet recording medium according to claim 1, wherein the inorganic fine particles have an average secondary particle size of 1 \u03bcm or more and 3 \u03bcm or less, and the solid content mass G (gm2) of the inorganic fine particles in the ink receiving layer falls within a range of 0.3R\u2266G\u22661.0R where R is the secondary particle size.
4. The ink jet recording medium according to claim 1, wherein in a particle size distribution curve of the inorganic fine particles as determined by the Coulter counter method, 15% by number of particles or more of all the inorganic fine particles are present in a pore size range of 0.1 \u03bcm or more and 1 \u03bcm or less.
5. The ink jet recording medium according to claim 1, wherein the inorganic fine particles are of amorphous silica.
6. The ink jet recording medium according to claim 5, wherein the amorphous silica has an oil absorption of 200 cm3100 g or more.
7. An ink jet recording method comprising applying a water-based ink to the ink jet recording medium according to claim 1 by an ink jet recording system to form an image.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A data storage system for transferring data between a host computerserver and a bank of disk drives through a system interface, such system interface comprising:
a plurality of first directors coupled to the host computerserver;
a plurality of second directors coupled to the bank of disk drives;
a cache memory;
a data transfer section coupled to the plurality of first directors, the second directors, and the cache memory;
a messaging network coupled to the plurality of first directors and the plurality of second directors, such that the plurality of first and second directors controlling data transfer between the host computer and the bank of disk drives in response to messages passing between the directors through the messaging network as such data passes through the memory via the data transfer section; and
a service processing network for interfacing a plurality of service processing units to the plurality of first and second directors through a plurality of redundant communication channels.
2. The system recited in claim 1 wherein the service processing network comprises a pair of service processing switches each one being coupled to the plurality of first and second directors, each one of such switching networks having a plurality of ports, one of such ports being coupled to a corresponding one of the service processing units through a first communication channel, another one of such ports being coupled to another one of the service processing units through a second communication channel; and, still another one of such ports being connected directly to the other one of the ports of the other one of the service processing network switches through a third communication channel.
3. The system recited in claim 2 including a backplane wherein the first, second and third communication channels pass through the backplane.
4. The system recited in claim 3 wherein the first, second and third communication channels are Ethernet channels.
5. The system recited in claim 2 wherein such system is configured to enable states of service processing units to operate independently and to be synchronized with each other.
6. The system recited in claim 3 wherein the system is configured to provide fault tolerance in the event of any single failure in one of the service processing switches or in one the service processing unit.