Instruction/ maintenance manual of the product AX696-96243 HP (Hewlett-Packard)
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HP S to r e V irtual S tor age Multi- Site C onf i gur ati o n Guide Abstract This gui de contains detailed instru ctions f or designing and implementing the Multi- Site SAN f eatures o f the LeftHand OS . The Multi-Site S AN featur es enable y ou to sy nchr onousl y and automaticall y mirror dat a between geogr aphic sites .
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C onte nts 1 Designing a Multi- Site S AN.........................................................................5 Designing the ne t w ork f or the Multi-Site S AN...............................................................................5 Best pr acti ces fo r implementing the Multi-Sit e SAN ne t w ork.
T o add ca pacity............................................................................................................28 R emov ing stor age s ys tems fr om a Multi-Sit e clus ter.................................................................
1 Desi gning a Multi- Site S AN The HP S tor e V irtual Multi-Site S AN featur es ena ble you to s y nchr onou sly mirr or data be t w een sites auto matically . Y ou cr eate a Multi- Site S AN by conf igur ing equal number s of stor age s ys tems into sites in the s oftwar e.
• Lo w round-trip latenc y —In orde r to not impact disk I/O t o the applicatio n server , the round-tr ip latenc y bet w een the sites mu st be no mor e than 2 ms. • Redundant links —Ha ve multiple ph y sical connecti ons (media) betw een the sites f or redundanc y .
Sample r ecomme nded networ k conf igur ati ons for Multi- Site S ANs This s ection pr o v ides illus trati ons of common netw ork conf igur ations f or the topologi es desc ribed in T able 1 (page 6) .
Figur e 3 T riangular network with Failo ver Manager 1 . Dual r edundant GigE links Figur e 4 Hub and spoke networ k core with redundant links out t o eac h site 1 .
Figur e 5 Combination full-mesh core with tr iangular links to all sites 1 . F ull mesh core ne t w ork Using m ultiple subnets IMPORT ANT: Be st pr actice is to u se a single subnet in mo st cases . Y ou can use multiple su bnets with a Multi- Site S AN.
Figur e 6 M ulti- Site SAN mapping to subnets, VI P s, and application ser vers 1 . Dual r edundant GigE links Co nnecting vo lumes to multiple subnets in a Multi- Site S AN using the Mi cr os oft iS .
Figur e 7 Entering VIP s in a Multi-Site S AN configuration 2. On the T argets t ab, s elect the v olume to log on to . 3. C lick L og On . 4. Selec t the Enable multi-path check bo x if using MP IO . Figur e 8 Logging on to v olume 5 . [Optional] If y ou w ant this volume t o be av ailable after r ebooting, s elect the Automaticall y restor e.
Figur e 9 T arget portal value remains Def ault 8. After s etting the values , cli ck OK to c lose the Ad vanced Se ttings dialog . 9 . Clic k OK again to finish logging on . 1 0. If y ou want t o set the MPIO load balanc ing poli cy , see the HP St ore Virtual Stor age DSM f or MPIO Deplo y ment Guide .
In addition t o setting up the Multi-Site c lust ers fo r data repli cation , it is important to se t up the S AN managers f or quor um corr ectl y to ensur e that in the ev ent of a f ailure the s y stem can be pr oper ly r ecov er ed. Maint aining quorum can be e ither an aut omated pr ocess or manuall y r ecov er ed by an Adminis trato r .
Figur e 1 1 T wo ph ysical sites, logical thir d site: c luster spans two sites, Failo ver Manager in logical third site 1 . V olumes ar e conf igured w ith Netwo rk RAID- 1 0 Figur e 1 2 Thr ee phy sical sites: c luster spans three sites 1 .
Figur e 1 3 T wo ph ysical sites: cluster spans t wo sites, one site is the primary site 1 . V olumes ar e conf igured w ith Netwo rk RAID- 1 0 Bes t pr acti ces f or conf igur ing qu orum and manager.
T able 3 Common Multi-Site S AN configurations with r ecommended manag ers Number of managers and number Needed to maintain quorum Manager configuration Multi-Site S AN configuration • Manager count.
T able 4 Data protection lev els and the suppor ted number of sites Number of sites supported Data protection lev el T wo Netwo rk RAID- 1 0 Thr ee NO TE: T w o sites ar e supported, bu t not consider ed a best pr actice conf igur ation .
T able 5 Failur e conditions and resolutions Resolution steps Failur e condition None . The pr imar y site w ill continue to oper ate . Secondary site off line None . The pr imar y site w ill continue to oper ate . Networ k link between sites f ails Primary site o ffline 1 .
T able 6 Alternati ve Multi-Site S AN configurations (continued) Details Description Alternate configur ation be Multi-Site if it is to co ntain stor age sy stems fr om differ ent subne ts.
2 Imple menting a Multi- Site S AN After y ou ha ve de signed the Multi-Site S AN co nfigur atio n, y ou ar e read y to implemen t it. Bef or e y ou begin Install Multi- Site S AN featur e k ey s on the st orage s y stems y ou ar e going to u se . R egister y our stor age s ys tems.
Figur e 1 4 Using the manag ement group w izar d to create a Multi-Site SAN NO TE: Y ou must ha ve at leas t one stor age s ys tem for eac h site in the A vaila ble S yst ems pool bef or e starting.
Cr eating sites When c r eating a new site , y ou fir st cr eate the sit e and then assign s tor age sy stems t o that site: 1 . Clic k N e w to open the New Sit e windo w . 2. Ent er a name for the site and an opti onal desc ripti on. 3. [Opti onal] Mak e the site pr imar y , if appr opri ate .
Figur e 1 6 Vie wing the Sites Details tab windo w C on ve r ting an e x isting S AN to a Multi-Site S AN P lan the conv ersi on accor ding to the cr iter ia des cr ibed in “Prepar ing to con vert an e x isting S AN to a Multi-Sit e SAN” (page 20) .
1 0. Assign o ne or mor e VIP s as planned for y our site la yo ut, and the n clic k Next . The Cr eate V olume w indow opens w ith the Skip V olume Creati on box c heck ed . If yo u want to c reate a ne w v olume for y our Multi-Sit e clus ter , clear the bo x and fill in the v olume info rmation .
Best pr acti ce Install the F ailo ve r Manager on a serve r in a separat e phy sical locati on fr om the S AN sites , and then add it as a separ ate site in the manage ment gr oup . Doing so w ill pr ev ent los s of quor um in a site failur e , r egardle ss of w hich single site f ails.
V ie w ing sites in the CM C T o v ie w sites in the CM C, select the Sites node in the nav igati on w indow . The Site s node is displa yed in e very management gr oup . T ypi cally , how ev er , the Sites Details tab sh ow s the stor age s ys tems as unas signed.
• Sites • Sites (Gr ouped) Designating a pr imary site Use the Pr imary designati on when y ou ar e using the Multi- Site clu ster to maint ain a primary site and a second sit e as a back up site . Designat e the site as Pr imar y whe n you c r eate the site , or y ou can edit an e xis ting site to mak e it primary .
1 . Select the Sites node in the na vi gation w indo w . 2. Se lect the site y ou wan t to delete in the Details ta b, r ight-cli ck , and then selec t Delete Site . NO TE: If onl y one site will be le ft in the clust er , the war ning sho wn in “Deleting a site that contains a s torage s y stem cau ses this w arning ” (page 28) is display ed .
R emo v ing sto r age s ys tems f r om a Multi-Sit e clu ster R emov ing stor age s ys tems fr om a Multi-Sit e clus ter affec ts the capacity of the c luste r and the Multi-Site co nfigur ati on. • Ensur e that the capac it y r emaining after y ou r emov e the stor age s ys tem(s) is suffi c ient f or the data on the v olumes .
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Glos sary The f ollo w ing glossary pr ov ides de finiti ons of ter ms used in the L eftHand OS so ft war e and the HP Sto re Virtual St orage . acting primary volume The r emote v olume , when it as sumes the r ole of the primary v olume in a failo ver sce nario .
DSM De vi ce Spec ifi c Module. DSM f or MPIO The HP S tor e V ir tual DSM f or Mic r osoft MP IO vendor -spec ifi c DSM that inte rfaces w ith the Mic ro soft MPIO f rame w ork. failback After f ailov er , the proce ss by w hic h you r est ore the pr imary volume and turn the ac ting primary back in to a remo te volume .
MIB Management infor mation bas e. A data base of managed obj ects accessed b y netwo rk management pr otocols. A n SNMP MIB is a set of par ameter s that an SNMP management s tation can query or set in the S NMP agent of a netw ork de vi ce (for e xam ple, a r outer ).
RAI D rebuild r ate The r ate at w hich the RAID conf igurati on r ebuilds if a disk is replaced . RAI D status C ondition o f R AID on the stor age s yst em: • Normal - RAID is s ync hroni z ed and running . No acti on is req uired . • Rebuild - A ne w disk has been ins erted in a dri ve ba y and RAID is curr entl y rebuilding .
site A user -desi gnated location in w hic h stor age sy stems ar e installed . Multi-Site S AN conf igur ations hav e multiple sites w ith sto rage s ys tems in each site , and eac h site has its ow n subnet . A site can be a logical conf igur ation , such as a su bnet within the same data cent er , depar tment , or applicati on.
volume si ze T he siz e of the virtual de vi ce communicated to the ope rating s ys tem and the applicati ons. VSS Pr ov ider HP Sto re Virtual VS S Pro v ider is the har dw are pr ov ider that su pports the V olume Shado w Cop y Serv ice on the HP Stor e Virtual Stor age .
Inde x S y mbols 2 -site conf igur ations pr imar y site designati on in, 1 7 A adding additional ca pacity to e xisting sit es, 2 8 site , 2 7 stor age s yst ems to Multi-Site c luster , 28 alter nat.
fo r sites, 2 6 MPIO and m ultiple subnets, 1 2 Multi-Site c luste r cr eating , 2 1 r emov ing stor age s yst ems fr om, 2 9 w iz ar d, 2 3 Multi-Site S AN alter nativ e confi gurati ons, 1 8 common .
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