Article View: comp.sys.ibm.pc.hardware.storage
Article #846Re: Question on EMC Symmetrix Software
From: David A. Lethe
Date: Mon, 21 Jan 2002 06:38
Date: Mon, 21 Jan 2002 06:38
33 lines
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3103 bytes
On Mon, 21 Jan 2002 04:48:19 GMT, "Foozer" <Foozer@home.net> wrote: > >> Whoops, common misconception. Metavolumes are not striped. Metavolumes are >> simply a set of basic hipervolumes that have been concatenated and >presented >> to the pirt as on logical device. If you are using 4GB Hipervolumes, and >you >> use these to create a 32GB Metavolume then you should understand that only >> capacity is increased, not performance. A 2GB file allocated within the >> first 4GB of the metavolume will not be striped across more disks. It will >> simply be on the first hipervolume, one spindle for RAID-S and mirrored on >2 >> spindle for RAID-1. If file has uniformly random access and it traverses 2 >> hipervolumes, only then will you have some performance improvement. > > >Ron, > >You're wrong. The Symm has been able to stripe Raid 1 drives for about 1.5 >years and can also now stripe RAID-S volumes. >I can see it coming, so I will save you the trouble ... before any swipes >are taken on Raid-S vs. Raid-5 .... the RAID-S stripped metas way out >perform conventional both RAID-S and RAID-5. > > > ... no, the RAID-S striped metas way outperform conventional EMC RAID-5. I dare you to show me an audited benchmark that shows EMC outperforms any high-end RAID subsystem. EMC has never been known for performance. People buy EMC for their software and firmware.
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