I grabbed a new SSD M4-CT064M4SSD2 from Crucial.
I am disappointed. I stuck the unit in an Atom machine (zotac) with
CentOS 6 on the disk.
It really doesn't "feel" faster than the previous 5400 RPM drive that
was in it.
The SSD is giving me (in the zotac running centos 6):
hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 298 MB in 3.00 seconds = 99.30 MB/sec
The Samsung 5400 RPM disk (in the zotac running Centos 6):
hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 196 MB in 3.01 seconds = 65.02 MB/sec
I'm not supper impressed at all. Sure the numbers say its "slightly"
better but I don't "feel" it.
I was expecting like really noticeable change in application load time or
something - but not really.
Just wondering... Is there something that has to be done to take
advantage of the SSD performance?
Thanks,
jerry
You need to verify that "AHCI" is enabled for the sata interface.
-Connie Sieh
< http://hardware.slashdot.org/story/11/09/06/2317211/Costly-S[..] >
says that it depends on how you use it.
mark
The point of an SSD isn't the transfer time when reading sequentially
ordered sectors, it is that you don't have to wait 8msec/track every
time the head has to move and wait for the disk to spin around to the
sector you want when that doesn't immediately follow the last one.
The OS makes a great effort to cache everything and avoid the delays
so you may not notice a big difference except the first time you load
something new.
--
Les Mikesell
lesmikesell*******
I'll note that CentOS 6 and my SSDs haven't (yet) worked and played
well together. Debian 6, otoh, screams...
I'm semi-sure my CentOS/SSD issues are pilot error, but I haven't had
time to troubleshoot.
--
Paul Heinlein <> heinlein*******/
From: Jerry Geis <geisj*******>
> I grabbed a new SSD M4-CT064M4SSD2 from Crucial.
> I am disappointed. I stuck the unit in an Atom machine (zotac) with
> CentOS 6 on the disk.
> It really doesn't "feel" faster than the previous 5400 RPM drive
> that was in it.
> The SSD is giving me (in the zotac running centos 6):
> hdparm -t /dev/sda
> /dev/sda:
> Timing buffered disk reads: 298 MB in 3.00 seconds = 99.3 MB/sec
Intel 5 Series/3400 Series Chipset 6 port SATA AHCI Controller
64GB Crucial 2.5" RealSSD C300 rev 7 (udma5)
# hdparm -t /dev/sda
Timing buffered disk reads: 636 MB in 3.01 seconds = 211.58 MB/ec
# hdparm -T /dev/sda
Timing cached reads: 18016 MB in 2.00 seconds = 9023.48 MB/sec
JD
Not sure about Centos 6 but I just got a new System with a Crucial M4 128G
disk and and the difference to my previous non-ssd system is *huge*:
/dev/sda:
Timing buffered disk reads: 700 MB in 3.00 seconds = 233.11 MB/sec
And that's just the throughput. What really is amazing is the reduced
latency which makes the desktop fly.
100mb/s sound really broken though. Even the slowest ssd drives should give
you more than that. Try installing Fedora 15 (what I'm using right now) and
if you see the same performance then it might be a hardware problem. If the
performance is much better under Fedora 15 though then there might be an
issue with Centos 6 and ssd's (though I'm not sure what that could be in a
simple read-only benchmark).
Regards,
Dennis
This just occured to me: are you maybe cpu bound? Since you use an atom
based system maybe your system simply cannot deliver the full performance
of the drive?
Regards,
Dennis
I'm going to guess, off the top of my head, based on my experience, that
your atom cant process the data fast enough and your benchmark isnt
really worthwhile.
get a copy of iozone setup on the box, and get it to run through a few
iterations with the 5400rpm disk and then the SSD.
I have an i5 @2.4Ghz per core, and it struggles to keep up with the
sata2 interface ( with a Crucial M4 on the other side ). I suspect I can
go faster with a sata3 interface..
Some of my initial observations:
http://www.karan.org/blog/index.php/2011/08/29/a-few-notes-o[..]
- KB
I'm not a big fan of using hdparm for real benchmarking or comparing
things but for the sake of completeness.
/dev/sde:
Timing cached reads: 24004 MB in 2.00 seconds = 12025.18 MB/sec
Timing buffered disk reads: 982 MB in 3.00 seconds = 326.98 MB/sec
This is on a dual: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz with
05:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic
SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02)
- KB
From: Karanbir Singh <mail-lists*******>
> get a copy of iozone setup on the box, and get it to run through a few
> iterations with the 5400rpm disk and then the SSD.
FYI, here's an iozone of my SSD (some numbers look a bit strange)...
Dunno if I used correct parameters...
Auto Mode
Command line used: iozone -a -f /TMP/io.dat -U /TMP
Output is in Kbytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
rndom random bkwd record stride
KB reclen write rewrite read reread read write read rewrite read fwite frewrite fread freread
64 4 438043 516414 149896 15146 26434 1143223 15571 901377 139751 54141 503814 85548 91310
64 8 460591 645579 139388 14159 30841 1049372 28920 1066042 152018 674790 1163036 104092 87786
64 16 538156 695778 188137 17727 61121 752329 51074 983980 129816 70306 1336792 76091 62560
64 32 524487 673098 2358717 2067979 123543 1599680 70496 901377 106487 877797 82702 119634 110886
64 64 592827 727850 2133730 2133730 117026 703068 110932 789967 128511 780776 72329 130574 114285
128 4 524387 684081 192164 18570 43053 1332828 17472 1142750 83225 659704 662962 146814 152010
128 8 589446 780556 206504 21654 46092 826202 28546 1142750 263455 809997 702889 121441 123794
128 16 633995 1243315 210141 175573 50354 805138 48745 1377278 261657 819893 853794 137349 123680
128 32 646983 962469 240124 22654 99608 1705404 88216 1455701 252906 881842 895074 135136 116995
128 64 650117 908709 2608629 2621367 64341 1663139 125736 971174 140659 978253 101525 153312 151666
128 128 831319 1579934 2843510 2969325 15605 2004703 155173 992724 156485 921183 908709 151111 158238
256 4 552675 695966 199810 21801 38594 838988 18451 1312954 86426 1058076 695966 173918 173890
256 8 1185399 876662 237721 21990 54480 897923 35261 1642294 126295 850282 817898 176549 176811
256 16 699594 1213534 240597 240382 81580 2034350 50814 1694118 575175 924200 81956 151576 149696
256 32 714967 962301 231469 21696 75229 2170027 80407 2533571 393195 980760 985259 140508 135371
256 64 831194 965763 305057 28826 156275 1098113 105695 1552085 248792 1049800 104980 149010 159787
256 128 753077 987979 3169196 3159869 15116 1471270 147051 2849590 172383 1142514 1195962 16952 174399
256 256 750970 1057034 3123106 2726577 19798 1044693 177924 1108314 187559 1080434 1062263 18430 185229
512 4 577155 802555 244176 24268 50818 1605228 19018 1387437 78732 693003 711133 206274 205701
512 8 686358 929322 234753 23473 64777 1904125 34991 2560168 128863 867738 887461 211204 217316
512 16 727268 1015932 247468 251349 94850 1954379 57709 1992458 162333 920953 99322 209494 216114
512 32 756207 1759070 256360 261225 120443 2460437 96059 2089386 729244 980673 99256 214152 201342
512 64 804962 1049187 292739 296294 117138 2285029 115184 1992458 535024 1701913 1062161 207050 199992
512 128 803757 1117430 395717 407275 70899 2207515 155526 1712772 382945 1547395 1096322 17527 199454
512 256 781811 1051242 467168 442889 02941 2370799 188312 1645826 354323 1233614 1383861 21891 192412
512 512 797489 1135150 3220553 3239989 19533 2169601 197983 2047551 202138 2091421 1910902 19638 201664
1024 4 1186518 797460 254610 255488 64169 769872 20444 1321200 92702 735086 721139 234751 239971
1024 8 694214 971534 250789 25671 87349 2011877 38694 1924436 124999 876737 865605 237700 236757
1024 16 1393200 1035229 264048 263046 10211 1040496 63245 2094282 170436 941299 95257 234111 233462
1024 32 789544 1090700 262227 270331 13828 2265510 87165 4064103 192981 1032492 98761 240995 226351
1024 64 979064 1139005 281087 275710 30531 2426801 114198 2381058 1192117 1057924 1057924 23287 235614
1024 128 1512415 1131503 326320 320500 15593 1177088 154986 2188177 653445 1089317 1092921 22775 225400
1024 256 810095 1127641 333103 331944 20995 2240689 191331 3556008 633307 1183902 1192117 23174 230011
1024 512 799241 1203474 544921 576907 23700 2491561 204154 1483680 385101 1242826 1393200 22812 229864
1024 1024 808874 1141730 3179559 3379719 230320 142945 224963 1170352 231462 1163693 1145383 229189 228470
2048 4 593973 825097 260263 26337 55309 793175 23053 1465907 91396 1515833 725758 257154 252720
2048 8 697982 1956345 261953 264258 96271 1346636 40133 2043857 125652 904222 84488 253055 249541
2048 16 768206 1062347 260531 263472 17572 2263006 64036 2149199 161056 985558 114230 254472 253093
2048 32 811074 1113579 263173 264055 36033 1531781 92152 2280429 200232 1026055 1031848 248847 251103
2048 64 830442 1182403 277696 276489 53856 1196902 115484 2434922 217039 1075111 1047577 29912 248394
2048 128 1663811 1167617 287233 293785 16478 1183707 151346 2400894 1038459 1062741 1070556 24812 249028
2048 256 814612 1165557 300118 299762 19591 1149185 190262 2117935 1245675 1099327 1101018 24401 245091
2048 512 820213 2423929 368353 363567 22365 1177057 196508 1815360 650121 1194073 1202431 24487 247257
2048 1024 829159 1156456 532517 539948 24792 1163032 226248 1489548 438445 1271112 1397918 24698 247136
2048 2048 827163 1120990 3414387 3407614 247735 135963 244624 1159735 247914 1170959 1135362 248215 249028
4096 4 598209 833537 263140 26701 62354 773247 22688 1461270 94484 74147 771511 261940 260775
4096 8 705457 959940 262987 26626 92935 945933 43366 2290708 135903 1876390 884292 262328 261757
4096 16 770784 1079557 265507 262445 26050 1243493 68705 2246966 174075 980149 97381 259766 259896
4096 32 1671875 1135573 267325 263799 13619 1128413 98960 2412291 206182 1014351 1030659 21789 260148
4096 64 831157 1189345 274496 271164 49238 1284014 119664 2581185 229349 1060629 1063386 27577 257608
4096 128 884657 1185161 280104 281283 17802 1188276 160627 2582737 244595 1056520 1042796 25825 256416
4096 256 829832 1163647 283754 284464 20213 1892721 189366 2315406 1799541 1076176 1066952 25508 255376
4096 512 1763882 1194555 308991 309928 21322 1187619 198795 2066675 1139338 1116097 1114215 25853 259519
4096 1024 816114 1157064 363189 357602 24640 1616958 229454 1850719 774432 1213284 1200817 25603 256819
4096 2048 832043 1173664 514370 515419 26051 1135198 248663 1505315 461046 1236690 1409594 25552 256803
4096 4096 830153 1134898 3479956 2946397 261375 127820 257222 1131534 255950 2331431 1129600 256769 256592
8192 4 778782 839274 267328 26717 63447 806135 23845 1651290 114801 718540 735568 264772 264966
8192 8 835478 2019758 265940 266545 87161 1257225 43514 2048050 141375 876327 89062 263315 263458
8192 16 910124 2283220 266138 266963 20868 2138421 69520 2294656 177642 957234 96354 260526 261741
8192 32 1678721 1119107 268396 269623 14612 1568164 108596 2501472 210228 1029017 2057739 26326 264607
8192 64 839602 2410735 268767 270549 61193 1281228 117606 5939652 230449 1040516 1058108 22808 261884
8192 128 1267708 1175986 271952 274421 16213 1330493 157508 2645945 243636 1050666 1059772 26118 261790
8192 256 1742662 2324618 275232 275001 19617 1138236 192025 2407356 234203 1056773 1052404 26158 262488
8192 512 1300283 1131788 287306 287517 22267 1155073 198315 2238885 1799240 1081283 1051470 26234 262052
8192 1024 830671 1164626 306644 306564 23888 1188802 231852 2088635 1321894 2254900 1113486 26333 260999
8192 2048 820593 1147167 355478 351650 26091 1316626 245614 1833907 842960 1160848 1158852 26226 261834
8192 4096 1700993 1111828 501040 494656 2601451219779 257124 1401534 492932 1544201 1543924 26138 262430
8192 8192 771802 1051759 4300447 3660429 263646 161671 262741 1051598 261189 1065854 1054180 261392 261976
16384 4 863453 1042834 269398 269023 64615 931766 23711 3382395 106215 933450 985864 267896 267953
16384 8 1260981 1042170 268850 269580 95302 1536839 43093 2072372 138209 911183 101129 267975 265823
16384 16 847637 1447249 269190 269798 23304 1044832 70934 2274590 178301 1036839 1474578 267040 267079
16384 32 839600 1134550 269287 268493 43535 1167709 106886 2596538 211477 1967584 1022401 27345 268105
16384 64 1761143 2429812 268335 270564 15323 1550466 128209 6131941 234408 1126053 1063410 26729 267471
16384 128 1056624 1200910 273058 273089 17334 1489988 157796 2713417 248185 1033238 2061926 26699 267019
16384 256 1050454 1283904 273117 271500 20050 1260611 191958 2486160 226338 1098934 2161478 26701 266953
16384 512 959075 1150659 278195 279176 22958 1256646 201329 2359806 241730 1114024 1063887 26754 267480
16384 1024 1232994 1135337 288297 287665 2471072412919 234750 2279343 2029469 1087698 2073936 266558 265207
16384 2048 936924 1155263 306769 306730 25574 2391423 251948 2132502 1422975 1286524 1064810 26638 267148
16384 4096 1018084 1115996 350753 351021 2637131141902 260166 1682988 903290 1180832 1211752 26673 267227
16384 8192 1594241 1128383 504715 510292 2667621059900 263883 1292331 489748 1497880 1550781 26715 266789
16384 16384 1023802 1345704 4245663 3340956 267428 152089 266741 1238974 267009 2014772 1998541 266259 67014
32768 64 1333067 1590216 270501 270450 15214 1520564 128187 5467637 234951 1447734 2154255 26856 268328
32768 128 1168571 1596256 271456 271237 17190 1445617 160153 2741606 252888 1394982 1460255 26878 268691
32768 256 1345873 1481042 271906 271827 20361 1692914 193329 2482783 223924 1394331 1416198 26817 268733
32768 512 1192044 1670811 274572 274664 23217 1631384 199622 3199990 231933 1306431 1490130 26872 268374
32768 1024 1388765 1548210 278783 278769 2468001484193 234985 5208032 263626 1419694 1748636 26847 267205
32768 2048 1267865 1301667 287073 286623 2585411344938 252226 2289244 2152535 1432673 1421721 268156 268662
32768 4096 1197445 1706408 307271 305966 2623991382674 260642 2027846 1580997 1386174 1425185 267854 268651
32768 8192 1214255 1450347 350864 349726 2668441634003 264944 1746236 875754 1494278 1677316 26871 268203
32768 16384 1395860 1391719 508180 498806 267629 196341 267170 1629122 495374 1816202 1875024 268475 268484
65536 64 1435612 1772390 270344 270262 16809 1871549 128519 4400172 236732 1883966 1762853 26998 269346
65536 128 1571981 1905119 270715 270737 17092 2176771 159564 5547843 254819 1786396 1796296 26921 269388
65536 256 1569351 1865364 271014 270927 20380 1839081 191608 3306411 222927 1672690 1702717 26935 269424
65536 512 1444924 1941861 272232 272309 22958 2215028 201123 3066300 229254 1694572 1875086 26929 269389
65536 1024 1669622 1888328 274225 274555 2488931840484 237260 3187847 256409 1906718 1875086 26931 269430
65536 2048 1427701 1913008 278618 278590 2589222166272 252520 4785745 275798 1648534 1726080 26941 269415
65536 4096 1389951 1792466 286941 286666 2647691739691 261070 2771203 2584633 1535297 1564029 269373 269448
65536 8192 1401960 1640163 304358 306164 2663721665767 265205 2231916 1450169 1646342 1528570 269144 269234
65536 16384 1317362 1691516 351869 348360 268531 252556 267156 2215617 885994 1800544 2086537 269128 269214
131072 64 1612892 2143800 270107 270139 15112 2248694 133177 4307188 232837 1938218 1980625 26966 269664
131072 128 1616934 2340364 270605 270614 1696662253025 160681 4272244 254108 1926002 1975465 26952 269790
131072 256 1779007 2068587 270293 270394 1929742020375 191799 4055179 222207 1897667 1856205 26948 269492
131072 512 1641749 2074614 271004 270810 2163352198049 200805 4046433 227637 1906697 1906195 26940 269586
131072 1024 1589230 2073331 272280 272394 250832 272555 236639 4224055 253205 1980503 1990067 269738 269684
131072 2048 1647999 2200600 274076 274064 259902 243454 252975 4094716 267313 1728591 1802467 269607 269642
131072 4096 1581103 1938792 277987 278003 264201 275632 261498 3177415 281305 1633315 1646799 269631 269703
131072 8192 1591203 1814694 286688 262533 267219 144497 265755 2791321 2238822 1642283 1687269 269713 269712
131072 16384 1561385 1814221 305050 305186 250073 189456 267456 2666623 1503343 1746022 1773326 269529 69407
262144 64 1747603 2308192 270038 270031 15654 2265274 136715 5298294 203118 2064225 2034234 26989 269940
262144 128 1696097 2278602 270159 270111 1702462251751 161561 5175687 250249 2075600 2047070 26977 269812
262144 256 1720907 2225444 270312 270324 2025012309026 192607 5141489 222167 2008997 2054421 26992 269875
262144 512 1760230 2306226 270565 270531 2270862321153 200701 4515192 226715 2049489 2008630 26989 264718
262144 1024 1780214 2290449 271036 271075 250224 207141 238708 4522844 252389 2052442 2057350 269777 269783
262144 2048 1751409 2297312 272115 272138 260415 258536 252683 4557357 263629 1867669 1866005 269903 266436
262144 4096 1618061 2088996 273987 273948 264885 262244 261100 3621021 272603 1724486 1714141 267478 226497
262144 8192 1582029 1956242 277920 277996 266941 174719 265340 2873565 283735 1714983 1716311 269802 269780
262144 16384 1583519 2001190 286024 286734 268467 197384 267639 2855349 2259102 1841105 1747545 269829 65802
524288 64 1715225 2292201 270064 270054 15539 2334712 135907 5585731 198929 2128802 2098234 27000 269931
524288 128 1664495 2357474 270167 270203 1688312315461 161323 5712745 218384 2084645 2097974 27001 270008
524288 256 1711082 2409036 270212 270208 2004822339904 193324 5057332 221707 2051670 2084718 26998 270006
524288 512 1665833 2336275 270142 270266 2260082304674 200690 4919198 226705 2084337 2068522 26999 270040
524288 1024 1674400 2337253 270492 270496 246240 282751 238132 5088355 246454 2102668 2123165 269942 269988
524288 2048 1719811 2317110 271127 271117 257464 226196 252764 5147094 257823 1899966 1940255 269952 269931
524288 4096 1605039 2145941 272114 272136 260933 268352 261429 3889695 264774 1744190 1668543 269965 270014
524288 8192 1511447 1998505 273961 273848 265354 187979 265161 3008084 271051 1647351 1647792 269918 269968
524288 16384 1503421 1957321 277926 278163 264267 189636 267652 3020475 280544 1705290 1711909 269944 269862
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