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(Notes on using Data Replication Function and Snapshot Function at the same time)
In case you use both data replication and Snapshot with the D8 Series, the minimum size of cache
memory from the following table according to the total HDD capacity, the total capacity of the
replication volume (RV) and the total volume related to Snapshot function.
Total HDD Physical capacity: up to Max. capacity (other than RAID-6), up to 270,000GB
(RAID-6)
C ache
Functi on
～4G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 128
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um es
～8G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 128
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e
～16G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 256
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 192
～24G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 384
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 256
～32G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 512
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 384
～40G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 640
T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 112
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 576
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e
～48G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 768
T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 240
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 704
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 176
～56G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 896
T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 368
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 832
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 304
～128G B T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e1024 1024 1024 1024 1024 1024 1024
T otal capaci ty of R V (w /o R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 960
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e1024 1024 1024 1024 1024 1024 1024
T otal capaci ty of R V (w / R D R /D R )
T otal capaci ty of S napshot r el ated vol um e 896
Note) The above "RV total capacity (when using RDR/DR)" is the capacity in case the buffer area of
semi-synchronous sequence is 256MB.
*1 128GB is with 4 nodes configuration.
U sabl e capaci ty(TB )
0
5
10
15
20
25
30
35
40
112
96
80
64
48
32
16
0
0
5
10
15
20
25
30
35
40
112
96
80
64
48
32
16
0
0
5
10
15
20
64
48
32
16
0
0
5
10
15
20
25
30
35
40
240 224 208 192 176
160
144
128
112
0
5
10
15
20
25
30
35
40
176 160 144 128 112
96
80
64
0
5
10
15
20
25
30
35
40
368 352 336 320 304
288
272
256
240 224 208 192
0
5
10
15
20
25
30
35
40
240 224 208 192 176
160
144
128
112
0
5
10
15
20
25
30
35
40
496 480 464 448 432
416
400
384
368 352 336 320
0
5
10
15
20
25
30
35
40
368 352 336 320 304
288
272
256
240 224 208 192
0
5
10
15
20
25
30
35
40
624 608 592 576 560
544
528
512
496 480 464 448
165
170 175 180 185 190
195
200
96
80
64
48
32
16
0
0
5
10
15
20
25
30
35
40
560 544 528 512 496
480
464
448
432 416 400 384
165
170 175 180
48
32
16
0
0
5
10
15
20
25
30
35
40
752 736 720 704 688
672
656
640
624 608 592 576
165
170 175 180 185 190
195
200
205
210 215 220 225
224 208 192 176 160
144
128
112
0
5
10
15
20
25
30
35
40
688 672 656 640 624
608
592
576
560 544 528 512
165
170 175 180 185 190
195
200
205
210 215 220
160 144 128 112
96
80
64
48
0
5
10
15
20
25
30
35
40
880 864 848 832 816
800
784
768
752 736 720 704
165
170 175 180 185 190
195
200
205
210 215 220 225
352 336 320 304 288
272
256
240
224 208 192 176
0
5
10
15
20
25
30
35
40
816 800 784 768 752
736
720
704
688 672 656 640
165
170 175 180 185 190
195
200
205
210 215 220 225
288 272 256 240 224
208
192
176
160 144 128 112
0
5
10
15
20
25
30
340
345 350 355 360 365
370
375
380
385 390 395 400
944 928 912 896 880
864
848
832
816 800 784 768
0
5
10
15
20
25
30
340
345 350 355 360 365
370
375
380
385 390 395 400
880 864 848 832 816
800
784
768
752 736 720 704
45
50
55
60
65
70
75
80
96
80
64
48
32
16
0
45
50
55
60
48
32
16
0
45
50
55
60
65
70
75
80
85
90
176
160
144
128 112
96
45
50
55
60
65
70
75
80
96
80
64
48
32
16
0
45
50
55
60
65
70
75
80
85
90
304
288
272
256 240 224 208
45
50
55
60
65
70
75
80
85
90
176
160
144
128 112
96
45
50
55
60
65
70
75
80
85
90
432
416
400
384 368 352 336
45
50
55
60
65
70
75
80
85
90
368
352
336
320 304 288 272
45
50
55
60
65
70
75
80
85
90
560
544
528
512 496 480 464
230
235
240
96
80
64
48
32
16
0
45
50
55
60
65
70
75
80
85
90
496
480
464
448 432 416 400
32
16
0
45
50
55
60
65
70
75
80
85
90
688
672
656
640 624 608 592
230
235
240
245 250 255 260
160
144
128
112
96
80
45
50
55
60
65
70
75
80
85
90
624
608
592
576 560 544 528
230
235
240
245 250 255 260
96
80
64
48
32
16
every 5TB
1024
405
410
415
420 425 430 435
752
736
720
704 688 672 656
every 5TB
1024
405
410
415
420 425 430 435
688
672
656
640 624 608 592
95
100
105
110
115
120
80
64
48
32
16
0
95
100
105
110
115
120 125 130 135
140
192
176
160
144
128 112
96
80
64
95
100
105
110
115
120
80
64
48
32
16
0
95
100
105
110
115
120 125 130 135
140
320
304
288
272
256 240 224 208
192
95
100
105
110
115
120 125 130 135
140
256
240
224
208
192 176 160 144
128
95
100
105
110
115
120 125 130 135
140
448
432
416
400
384 368 352 336
320
95
100
105
110
115
120 125 130 135
140
384
368
352
336
320 304 288 272
256
95
100
105
110
115
120 125 130 135
140
576
560
544
528
512 496 480 464
448
265
270
275
280
64
48
32
16
0
95
100
105
110
115
120 125 130 135
140
512
496
480
464
448 432 416 400
384
0
285
290
295 300 305 310
315
1024 1024 1024 1024 1024 1024 1024 1024 1008
440
445
450
455
460 465 470 475
480
640
624
608
592
576 560 544 528
512
285
290
295 300 305 310
315
1024 1024 1024 1024 1008 992
976
440
445
450
455
460 465 470 475
480
576
560
544
528
512 496 480 464
448
145
150
155
160
48
32
16
0
145
150
155
160
176
160
144
128
145
150
155
160
112
96
80
64
145
150
155
160
304
288
272
256
145
150
155
160
240
224
208
192
145
150
155
160
432
416
400
384
145
150
155
160
368
352
336
320
320
325
330
335
992
976
485
490
495
500
496
480
464
448
320
325
330
335
960
944
928
912
485
490
495
500
432
416
400
384
21
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