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Found 2 results

  1. Good morning! We are going to extend the last Storage-Tier with 43 7.2k Drives (ST9100640SS). The primary aim is capacity, secondary is speed. - Te used controller is a MegaRaid 9285W-8e featuring a LSI2208-Chipset+1GB Cache - As our hole SAN is completely mirrored we decided to configure the Drives in Raid5-Stripes. - Because we have to reconfigure the SAN online we can put together a maximum of 10 Drives in a singel Raidset (put in 10 drives, configure, migrate date from old drives to new, remove old drives, put in another set of new drives and so on) - We want to use at least 1 Drive as Hotspare! - Our san spreds datablocks across all Raidsets within a Tier theoreticaly accumulating the Performance of all Raidsets in best case. What Raid-size should we choose? We are debating Sets of 7 x 6 Drives + 2 HS, 5 x 8 Drives + 3 HS or 4 x 10 Drives + 3 HS. For all 3 configurations the theoretical MTTDL / propability of Dataloss is acceptabel We benchmarkt all three sizes. The relativ Raidset-Performance is exactly what we theoreticaly calculated ( Handling the 10Drive-Raidsetiops as 100% we reached: 10Drive Raidset: 100% / 8 Drive Raidset: 76% (75 calculated) / 6 Drive Raidset 61% (60% calculated) ) Of corse 4 Sets of 10 Drives gives the highest netto-capacity 7 Sets of 6 Drives benefits in a slightliy higher (~5%) accumulated Performance We are trending to use the 4 x 10 Drives configuration but our reseller continously jells us to use the 6drive-set configuration. Now im a little bit helpless. Can someone give me a hint?
  2. Dronissimo

    Raid 5 3ware Verify

    Good day every one, I have raid 5 on "3 ware 9550SXU-4LP" controller i want to ask: - do i need run from time to time verify schedule or i can use only smart-tests ? - how often do you run first or second ? - Did i understand right that verify would check hardware errors and RAID array consistency? - Should i use AutoVerify option ? Please tell me if i wrong in it. Sometimes i see 0001 Controller reset occurred Is this mean that i need to replace drives ?