ASM Comparisons

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http://www.linkedin.com/groups/ACFS-OCFS-Which-one-is31561 !.S.1! 15!56 That is ASM=Cluster File System + Volume Manager. Oracle binaries directly talks with atabase !iles in ASM diskgrou using ASM instance.ASM itsel! automatically mount all artitions without third arty inter#ention. For OCFS it uses OS to mount all artitions and use OS to locate them. ASM has !unctionality o! Mirroring and Stri ing conce t to reduce $O inter#ention. These reasons ACFS is Faster than OCFS FileSystem. %aw F
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  http://www.linkedin.com/groups/ACFS-OCFS-Which-one-is-31561!.S.1! 15!56   That is ASM=Cluster File System + Volume Manager. Oracle binaries directly talks with atabase !iles in ASM diskgrou using ASM instance.ASM itsel! automatically mount all artitions without third arty inter#ention. For OCFS it uses OS to mount all artitions and use OS to locate them.  ASM has !unctionality o! Mirroring and Stri ing conce t to reduce $O inter#ention. These reasons ACFS is Faster than OCFS FileSystem. %aw FileSystem is also !aster than OCFS FileSystem...===============================================================.The srcinal &uestion really doesn't make sense. There are ( di!!erent technologies that are being discussed here) and the di!!erences are im ortant. OCFS * general ur ose CFS * can be used !or database and non*database !iles * included in the inu, kernel * only a#ailable on inu, or -indows * uses its own 'clusterware' * can be use!ul i! migrating !rom a traditional !ilesystem based en#ironment with a lot o! legacy scri ts etc  ASM * can only be used !or database !iles) both %AC and non*%AC. $ncluded in the Oracle rid $n!rastructure on all su orted lat!orms * re!erred technology !or database storage  ACFS * CFS built on to o! ASM * you could look at it as ASM manages the hysical de#ices) ACFS is VM * cannot be used !or database !iles * not a#ailable on all lat!orms  and while we are discussing it) there is also now irect/FS in the mi,. $ sus ect they wanted to know the di!!erence between ASM and OCFS !or the database) and $ sus ect the true answer) like a lot o! &uestions about Oracle) is '$t de ends...'  As to whether '%aw FileSystem is also !aster than OCFS FileSystem' $ belie#e the di!!erences are marginal) and are !ar outweighed by the di!!iculty in managing raw de#ices 0not to mention they are not really su orted anymore1My best answer in this situation would be a set o! &uestions2 3-ell ... that de ends on a lot o! things. -hat are you intending to use ACFS #s. OCFS4 !or5 Are you intending to store a database's data!iles) control !iles) or redo logs on the !ile system5 -hat kind o! s eed and through ut do we need) and why53 Frankly) ACFS is s eci!ically aimed at storing non*Oracle database !iles 0e.g. con!iguration !iles and binaries !or a lication !iles1 because o! its sna shotting !eatures. $ don't see a lot o! #alue !or ACFS in an Oracle database realm because ASM is aimed directly at e!!icient $6O !or Oracle database !iles. The 7,adata 8M doesn't e#en ermit  ACFS to be used) so $'m not sure that ACFS is a likely candidate !or many use!ul ur oses in the multi*T8 or *98 range. LiShan Cheng Technical Manager at ORAUX $ had to use OCFS4 !or :T;F$7 !or my last <<g%4 %AC im lementation because the customer was told that i! they wanted to use ACFS !or :T;F$7 they had to ay !or licenses. A ain. Also OCFS4 usually works ok but i! the $6O load is high we might see e#ictions due to the disk heartbeat works  A !ew years ago $ was im lementing 7,tended %AC <g%4 and we used /AS !or :T;F$7) e,ternal tables and backu ur oses. Deepak Sankpal, PMP, ITIL Experienced Database Analyst  Com aring ACFS to OCFS is like com aring A les to Oranges. /o doubt ACFS is the best. OCFS is old. ACFS is a layer on Oracle  ASM. There are a number !eatures and ad#antages ACFS o!!ers such as2 * eneral ur ose !ilesystem !or non*8 !iles. ACFS is a multi* lat!orm) scalable !ile system that e,tends Oracle ASM !unctionality to su ort !iles maintained outside o! the database. * ynamic !ilesystem resi>ing. * ?igh 9er!ormance. * Su orts /FS and C$FS rotocols. * Ad#anced !eatures2 Sna shot) %e lication) Tagging) Security and 7ncry tion. * Starting with <<.4..() ACFS su orts %MA/ backu s) archi#e logs) and ata 9um dum sets. Oleks#ndr  Oleksandr Denysenkooracle: consulting, outsourcing and support services in Ukraine Ch#ndr#Sekh#r$% think th#t it w#s #n indirect 'uestion - (ou h#)e to discuss *ene+its #nd dr#w*#ck o+ e#ch product$ *ut not re#ll, pro)ide direct #nswer to this 'uestion  *ec#use its e)en impossi*le to do *enchm#rks in some c#ses ust # short summ#r, on #lre#d, pro)ided in+o m, !.!0: OCFS doesnt directl, rel#tes to 11g rele#se 0$ *ut ACFS w#s introduced in 11.0 ACFS doesnt support d#t#*#se +iles$ *ut OCFS - does - how to do  *enchm#rks 2 OCFS runs onl, on inu4 Windows OCFS h#s its own cluster th#t m#, decide th#t its time to re*oot e)en  e)er,thing seems ok  OCFS h#s some cl#ims on its st#*ilit,$ especi#ll, during high worklo#d ACFS now re'uires licensing #s Cloud FileS,stem$ *ut OCFS is +ree ACFS h#s *uilt in mirroring on AS le)el$ OCFS doesnt#nd this mirroring m#, *e used with disk s,stems distri*uted o)er 0 di++erent sites - +or dis#ster reco)er, ACFS h#s *uilt in sn#pshot support$ OCFS doesnt ACFS ust c#nt *e 1!4 +#ster th#n OCFS- #s #lw#,s - %t depends... oracio Miranda Senior Oracle DBA at Unisys u!!) look like we need to start !rom scratch here) as Oleksandr say be!ore agree they ask OCFS #s ACFS to check your background and how old you are with Oracle. OCFS !rom the time or %AC @i) < use  ASM and << use OCFS. Also i! the inter#iew is related to 78S %<4 or <<i ACFS it is not su orted at all. Oracle su ort OCFS only. 0 why) ACFS er!orm badly when strike < s ecially i! you share this ACFS o#er /FS 0 what work at kernel le#el 1) the real e, lanation here is more com licated 0 we can o en a thread about what6why  ACFS #s OCFS and what ha ens i!.... They key !actor here is the way you answer the inter#iew and how much you know about roducts 0 how to use them 1 as Oracle sale bo,es and you use the bo,es as the recommendations !rom the #endor) !or this case Oracle. $! some ask what is better) you need to say what e#er it is certi!ied and su orted !or your solution) bits more bits less 0ACFS or OCFS 1 doesn't really care i! the #endor su ort the com onents. Bust kee on mind. the conce t is CFS 0 cluster File system 1 use OCFS) ACFS) VeritasFS) Ad#anceFS 0 truD 1 doesn't really matters as they share the !ilesystem across the nodes. 0 FS) or CEFS !rom silicon ra hics they works 1 but Oracle at the moment su ort ACFS
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