【正文】
ge 35 全局拷貝 Global Copy ? The primary storage subsystem no longer waits for the secondary I/O to plete ? Latency issues are eliminated ? Unlimited distances ? Up to 128 outstanding I/Os per logical drive ? Increased performance ? Benefit: Flexibility in designing remote mirroring solutions 信息高可用 L2+級(jí)課程 Page 36 ?Ensures that all I/Os to the secondary system are in the same order as it was processed at the primary ?Eliminates outoforder arrivals at the remote site ?Logical drives defined in a consistency group participate in write order consistency ?Optional mode for asynchronous mirroring ?Benefit: Provides proper database logical consistency for successful recovery 全局鏡像 Global Mirror (寫一致性 ) 信息高可用 L2+級(jí)課程 Page 37 動(dòng)態(tài)同步鏡像模式切換 ?Ability to dynamically change from ? Metro Mirror to Global Copy ? Global Copy to Global Mirror ? And in reverse order ?Switching modes to allow for ? Applications loading – peak periods may exceed bandwidth ? Communications bandwidth – shared portion allowed for mirroring ? Communications outages that drop the available bandwidth ?Selectable on a per logical drive basis ?Benefit: Maximum flexibility to adjust to changing applications loads and munications bandwidth requirement 信息高可用 L2+級(jí)課程 Page 38 鏡像對(duì) ?Up to 64 Mirror Pairs (preCrystal) ? DS4100 – 32 mirror pairs ? DS4200 – 32 mirror pairs ? DS4300 Turbo – 32 mirror pairs ? DS4700 – 32 mirror pairs ? DS4400 – 64 mirror pairs ? DS4500 – 64 mirror pairs ? DS4800 – 64 mirror pairs ?Up to 128 Mirror Pairs ? DS5020 – 64 mirror pairs ? DS5100/5300 – 128 mirror pairs ?Mirror pairs defined across multiple storage subsystems ?Cross mirroring for more data protection ?Role Reversal for failover recovery ?Benefit: Flexible remote mirroring designs 信息高可用 L2+級(jí)課程 Page 39 local site cluster Production Systems DB Server App Servers … A B FlashCopy 本地 HA解決方案 : Server Availability + Flashcopy 信息高可用 L2+級(jí)課程 Page 40 local site cluster Metro Mirror 本地 HA解決方案 : Server Availability + Metro Mirror 信息高可用 L2+級(jí)課程 Page 41 local site cluster HA System remote site DR System Metro or Global Mirror 異地容災(zāi)解決方案: ERM 信息高可用 L2+級(jí)課程 Page 42 local site cluster remote site Global Mirror HA System DR System 本地 HA+異地容災(zāi)解決方案: LVM + Global Mirror 信息高可用 L2+級(jí)課程 Page 43 經(jīng)驗(yàn)法則:估算數(shù)據(jù)鏡像帶寬 ? 遠(yuǎn)程復(fù)制鏈路帶寬 ? 聯(lián)機(jī)事務(wù)處理 (OLTP) ? 1 2 MB/sec./ TB ? 順序數(shù)據(jù)庫(kù)更新、批處理 ? 6 7 MB/sec./TB ? 如果使用數(shù)據(jù)壓縮 : 經(jīng)驗(yàn)值是 2:1 ? Varies somewhat by work vendor. ? OLTP 峰值系數(shù) : ~ ? 示例 鏡像 10 TB OLTP 數(shù)據(jù)需要 : ? OLTP: 10 TB 按 2:1 壓縮 = 5 TB 有效數(shù)據(jù)量 ? 5 TB x ( 1 – 2 ) MB/sec./TB = 5 10 MB/sec. 平均值 ? 5 – 10 MB/sec. (均值 ) x (峰值系數(shù) ) = – 25 MB/sec. 峰值 ? 批處理 /順序 IO: ? 5 TB x ( 6 – 7 ) MB/sec./TB = 30 35 MB/sec. 經(jīng)驗(yàn)值 : 1 OC3 = 15 MB/sec. 有效傳輸率 強(qiáng)烈建議用相應(yīng)的工具來(lái)計(jì)算和驗(yàn)證帶寬需求并預(yù)估未來(lái)增長(zhǎng) 信息高可用 L2+級(jí)課程 Page 44 該客戶采用 DS4800 ERM Global Mirror方式,在距離 50km的裸光纖連接下,使用 DWDM連接設(shè)備實(shí)現(xiàn),目前運(yùn)行狀況良好,性能滿足客戶要求。 東北某城市商業(yè)銀行災(zāi)備 信息高可用 L2+級(jí)課程 Page 45 數(shù)據(jù)中心系統(tǒng)高可用解決方案 DS4700/DS5000 磁盤系統(tǒng) LAN 客戶端 群集 DS4700/DS5000 磁盤系統(tǒng) Power 550/520服務(wù)器 Power 550/520 服務(wù)器 DS4700/DS5000 磁盤系統(tǒng) LAN 客戶端 群集 DS4700/DS5000 磁盤系統(tǒng) x3850M2 PC 服務(wù)器 x3850M2 PC 服務(wù)器 Power 550/Power 520 + DS4700/DS5000 System x3850M2 + DS4700/DS5000 統(tǒng)一服務(wù)及管理 ?應(yīng)用平臺(tái)和數(shù)據(jù)存儲(chǔ)平臺(tái)高可用性統(tǒng)一架構(gòu) ?同一管理平臺(tái),簡(jiǎn)化了管理、降低了管理復(fù)雜性、降低了管理成本 有效信息保留,滿足法規(guī)遵從要求 業(yè)務(wù)連續(xù)性保障 ?高性能服務(wù)器 +存儲(chǔ)配合 ?高可靠性硬件配置, 24X7 的應(yīng)用保障 信息保護(hù) 高性能的數(shù)據(jù)存儲(chǔ)實(shí)現(xiàn)完整數(shù)據(jù)備份、恢復(fù); 169。 Copyright IBM Corporation 2022 Thank You!