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amedina

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Hi all,
I'm changing the 6 SATA 7.2K HDD of my server for 6 SAS 15K HDD's. Kerio is installed in a VMware Esx3i virtual machine wich I have already backed up. The thing i'm planning to change from RAID 5 to RAID 10, but unfortunately I can't because the virtual drive created in RAID 10 is just 800 GB and my previous RAID 5 was 1.3TB, and my virtual machine backup does not fit in the RAID 10 Volumen Sad .
So, my options are RAID 5 or RAID 50, which one of those level you think is better for Kerio?

Thanks a lot for your help and Best Regards,
Amedina
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Pomodoro

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There are some good information here that will help you to decide in regards to read/write/degraded performance of each RAID level.

http://www.adaptec.com/en-US/_common/compatibility/_educatio n/RAID_level_compar_wp.htm

[Updated on: Mon, 12 July 2010 09:23]

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hbianchi

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I'm using 4 x 300 GB 15k SAS in RAID 5 (900 GB storage) and it performs well (with 450 GB SAS I could get 1,35 TB). I think RAID 50 should perform better but you need double HDs to reach same storage. If you have the money and the slots to put the drives, go ahead with RAID 50.
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elias

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I wouldn't bother with RAID 50. RAID 50 on a single RAID controller won't give you any extra performance over RAID 5. The overhead of RAID 5 is in the parity calculation for writes, and if you're just using one controller, the amount of work to calculate parity is the same. Similarly, since RAID 5 is already a stripe, striping across two RAID 5 stripes doesn't help with reads either; the work performed by each disk is the same.

RAID 50 is really only useful in SANs where each half of the RAID 50 set sits on a separate controller. Separate controllers means each controller only has to do half the work, so you can double your write performance. But for single controller scenarios, there's really nothing to gain.

-Elias
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