查看完整版本 : RAID 及 harddisk RPM

ck360913 2020-6-11 05:02 PM

RAID 及 harddisk RPM

要行Self-Encrypting, 15k rpm 已不再出新harddisk, SSD太貴, 想用10k rpm, 但要至少維持現有讀寫速度, 有無人識計? 謝謝.

RAID 1 1.2T 15rpm x 2 <- 現在
RAID 5 1.2T 10rpm x 3
RAID 10 1.2T 10rpm x 4
RAID 6 1.2T 10rpm x 4

[[i] 本帖最後由 ck360913 於 2020-6-11 05:13 PM 編輯 [/i]]

abcd5678 2020-6-11 06:39 PM

用SSD做cache layer. If your access is random, the speed is near pure SSD.

abcd5678 2020-6-11 06:44 PM

[quote]原帖由 [i]ck360913[/i] 於 2020-6-11 05:02 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520045487&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
要行Self-Encrypting, 15k rpm 已不再出新harddisk, SSD太貴, 想用10k rpm, 但要至少維持現有讀寫速度, 有無人識計? 謝謝.

RAID 1 1.2T 15rpm x 2 <- 現在
RAID 5 1.2T 10rpm x 3
RAID 10 1.2T 10rpm x 4
RAID 6 1.2T 10rpm x 4 ... [/quote]
R5*3, R6*4 is about the performance of a single drive on write. Slower than your current config.

windows311 2020-6-11 08:29 PM

[quote]原帖由 [i]abcd5678[/i] 於 2020-6-11 06:39 PM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520049816&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
用SSD做cache layer. If your access is random, the speed is near pure SSD. [/quote]


樓主話ssd貴喎!有encrytion既ssd好似都1T以上

productdesigner 2020-6-11 09:12 PM

有無用raid card?其他3種raid(5,6,10)刀快過Raid1(就算10,000rpm):smile_34::cr_02:smile_o10:,如果用ssd做cache要raid card有充電backup,因為如果部機突然無電,raid card用write back cache,如果無電池backup會file system corruption,全部data死晒:smile_29:

非常詳細report:  SAS Hard Drives: 15,000 vs. 10,000 RPM 共11頁
[url=https://www.tomshardware.com/reviews/sas-hard-drives,1702-8.html]https://www.tomshardware.com/reviews/sas-hard-drives,1702-8.html[/url]

[b][quote]原帖由 [i]ck360913[/i] 於 2020-6-11 05:02 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520045487&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url][/b]
[b]要行Self-Encrypting, 15k rpm 已不再出新harddisk, SSD太貴, 想用10k rpm, 但要至少維持現有讀寫速度, 有無人識計? 謝謝.

RAID 1 1.2T 15rpm x 2 <- 現在
RAID 5 1.2T 10rpm x 3
RAID 10 1.2T 10rpm x 4[/b][b]RAID 6 1.2T 10rpm x 4 ... [/quote][/b]

[b]Raid0 & Raid5, 10,000rpm vs 15,000rpm[/b]
[b][img]https://cdn.mos.cms.futurecdn.net/HdrmnGYgdzE9cUFuLNhFme-970-80.png[/img][/b]

[[i] 本帖最後由 productdesigner 於 2020-6-11 09:27 PM 編輯 [/i]]

windows311 2020-6-11 09:55 PM

[quote]原帖由 [i]productdesigner[/i] 於 2020-6-11 09:12 PM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520055939&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
有無用raid card?其他3種raid(5,6,10)刀快過Raid1(就算10,000rpm):smile_34::cr_02:smile_o10:,如果用ssd做cache要raid card有充電backup,因為如果部機突然無電,raid card用write back cache,如果無電池backup會file system corruption,全部data死晒:smile_29 ... [/quote]


題外話,如果raid 1 同 raid 5,一同死了一隻hard disk,raid 5 是否慢D?

productdesigner 2020-6-11 10:24 PM

會慢,直至加隻新drive rebuild完,但係中途唔可以再死多隻:smile_34::cr_02:smile_o10:,raid1記得好似無影響
[quote]原帖由 [i]windows311[/i] 於 2020-6-11 09:55 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520057853&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
題外話,如果raid 1 同 raid 5,一同死了一隻hard disk,raid 5 是否慢D? [/quote]

[url=https://community.spiceworks.com/topic/243218-raid-5-single-disk-failure]https://community.spiceworks.com/topic/243218-raid-5-single-disk-failure[/url]
If a drive fails in RAID 5 you lose performance (a lot of it) and you lose all protection but your capacity does not change.  Capacity can never drop (imagine the disaster that would be... which parts of which files would just vanish?)

abcd5678 2020-6-11 11:27 PM

[quote]原帖由 [i]windows311[/i] 於 2020-6-11 08:29 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520054017&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]



樓主話ssd貴喎!有encrytion既ssd好似都1T以上 [/quote]
CACHE LAYER

richardli008 2020-6-12 12:13 AM

Raid 5 一定慢過 Raid 1因為要計 Parity. Raid 10 基本上係Raid 1 + Raid 0 可能滿足你需要。

productdesigner 2020-6-12 02:07 AM

舊系統係Raid0>Raid1>Raid5>Raid6

但係依家啲新系統由於CPU夠快,所以parity運算已經不影響速度,而且Raid5&6可以同時對3-4隻以上HDD做平衡資料讀寫,所以依家係Raid0>Raid5>Raid6>Raid10:smile_34::cr_02:smile_o10:,但係儲存資料量Raid0>Raid6>Raid5>Raid10,平衡安全同資料量,依家通常係用Raid6

[img]https://static.techspot.com/articles-info/1277/bench/Bench_01.png[/img]

[img]https://static.techspot.com/articles-info/1277/bench/Bench_02.png[/img]

productdesigner 2020-6-12 02:40 AM

我部電腦用張hardware Raid卡(2GB Ram Cache)求其插4隻5900RPM HDD行Raid6 benchmark,重勁過SSD:lol:cr_02:fst_002:

windows311 2020-6-12 08:42 AM

[quote]原帖由 [i]productdesigner[/i] 於 2020-6-12 02:40 AM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520066755&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
我部電腦用張hardware Raid卡(2GB Ram Cache)求其插4隻5900RPM HDD行Raid6 benchmark,重勁過SSD:lol:cr_02:fst_002: [/quote]


如果SSD都行raid6呢?:smile_47:

ck360913 2020-6-12 08:46 AM

[quote]原帖由 [i]productdesigner[/i] 於 2020-6-12 02:07 AM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520066190&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
舊系統係Raid0>Raid1>Raid5>Raid6

但係依家啲新系統由於CPU夠快,所以parity運算已經不影響速度,而且Raid5&6可以同時對3-4隻以上HDD做平衡資料讀寫,所以依家係Raid0>Raid5>Raid6>Raid10:smile_34::cr_02:smile_o10:,但係儲存資料量Raid0>Raid6>Raid5>Raid10,平衡安全同資料量,依家通常係用 ... [/quote]
用Dell h710 RAID card

ck360913 2020-6-12 08:48 AM

[quote]原帖由 [i]productdesigner[/i] 於 2020-6-12 02:40 AM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520066755&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
我部電腦用張hardware Raid卡(2GB Ram Cache)求其插4隻5900RPM HDD行Raid6 benchmark,重勁過SSD:lol:cr_02:fst_002: [/quote]
我張RAID card好似得512Mb:smile_13:

productdesigner 2020-6-12 09:33 AM

其實SSD粒Controller係用咗平衡讀寫同時對幾組Flash memory module一齊read/write先咁快,原理同raid card一樣,所以就算用64G data test 張raid card,完全Cache唔到,因為同時對4隻HDD一齊read/write,所以transfer rate係將4隻疊加,可以達到SATA SSD速度:lol:cr_02:smile_o10:
[quote]原帖由 [i]ck360913[/i] 於 2020-6-12 08:48 AM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520072931&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
我張RAID card好似得512Mb:smile_13: [/quote]

productdesigner 2020-6-12 09:39 AM

SSD粒controller其實同Raid card差不多,又係同幾組flash module平衡read/write,所以先咁快,不過Raid Card快盡係RAM Cache或者條PCIe bus極速:smile_34::cr_02:smile_o10:
[quote]原帖由 [i]windows311[/i] 於 2020-6-12 08:42 AM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520072703&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
如果SSD都行raid6呢?:smile_47: [/quote]

ck360913 2020-6-12 12:34 PM

[quote]原帖由 [i]productdesigner[/i] 於 2020-6-12 09:39 AM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520075101&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
SSD粒controller其實同Raid card差不多,又係同幾組flash module平衡read/write,所以先咁快,不過Raid Card快盡係RAM Cache或者條PCIe bus極速:smile_34::cr_02:smile_o10:
[/quote]
即是SSD唔會快好多?

richardli008 2020-6-12 02:20 PM

[url]https://www.dataplugs.com/en/raid-level-comparison-raid-0-raid-1-raid-5-raid-6-raid-10/[/url]

參考下

ck360913 2020-6-12 04:36 PM

[quote]原帖由 [i]richardli008[/i] 於 2020-6-12 02:20 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520087508&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]
[url=https://www.dataplugs.com/en/raid-level-comparison-raid-0-raid-1-raid-5-raid-6-raid-10/]https://www.dataplugs.com/en/raid-level-comparison-raid-0-raid-1-raid-5-raid-6-raid-10/[/url]

參考下 [/quote]
其中個表有古怪
RAID 0, read high, write high
RAID 10, read high, write medium
為何 write medium? 應該一樣架:smile_41:

productdesigner 2020-6-12 09:13 PM

快盡係張Raid Card processor, Raid Card嘅PCIe速度同埋插槽速度(以最慢者為準):smile_34::cr_02:smile_o10:
[quote]原帖由 [i]ck360913[/i] 於 2020-6-12 12:34 PM 發表 [url=https://computer.discuss.com.hk/redirect.php?goto=findpost&pid=520083281&ptid=29139242][img]https://computer.discuss.com.hk/images/common/back.gif[/img][/url]

即是SSD唔會快好多? [/quote]

richardli008 2020-6-13 12:59 AM

[quote]原帖由 [i]ck360913[/i] 於 2020-6-12 04:36 PM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=520093208&ptid=29139242][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

其中個表有古怪
RAID 0, read high, write high
RAID 10, read high, write medium
為何 write medium? 應該一樣架:smile_41: [/quote]

試唸吓張Raid contoller card當要寫100M data時候係Raid 10之下其實實際要寫200M,即係雙倍data由Raid card data bus send 去兩組hard disk4隻或以上既硬碟,所以點都比Raid 0 只send 100M去兩隻碟慢少少。之前接觸過好多high transaction volume既appliance大多數用Raid 10,好多人覺得有啲嘥碟但要redundancy 又要write speed快就多數㨂Raid 10。如果用Raid5/6真係要換碟時部機拖到慢晒要好耐先可以rebuild到隻碟。當然講緊係傳統SAS/SATA碟唔係SSD啦。

productdesigner 2020-6-13 03:15 PM

成日講舊世代啲慢raid card,依家啲raid card邊有咁💩
我張係有2GB RAM Cache嘅SAS9361-8i 行Raid6刀有4xHDD Transfer Rate:$:cr_02:smile_o05:
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查看完整版本: RAID 及 harddisk RPM