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martygearbox
JBOD
Joined: 20 Aug 2006
Posts: 2
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 Posted: Sun Aug 20, 2006 10:53 pm Post subject: minimum requirements for a metadata LUN |
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| what are the minimum requirements for a metadata LUN? For example, can it be composed of a RAID 1 set composed of 2 drives? We are setting up an XSAN using a single XSERVE RAID and are trying to maximize the drives available for Data LUNS. On the other hand is it possible to use a smaller fibre based RAID device (noon-Apple) and incorporate into the SAN as the metadata storage? |
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matx
Xsan Master
Joined: 15 Apr 2005
Posts: 378
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| Posted: Tue Aug 22, 2006 5:06 pm Post subject: Single Xserve RAID |
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| just format the LUNs for both metadata and data (mixed). since you only have one RAID (with two LUNs). |
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martygearbox
JBOD
Joined: 20 Aug 2006
Posts: 2
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| Posted: Tue Aug 22, 2006 9:54 pm Post subject: mixing metadat and data on same LUN = bad ? |
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| It was my understanding that mixing metadata and data on the same LUN is a bad idea. |
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jordan
Been around the blocks
Joined: 12 Jan 2006
Posts: 24
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| Posted: Tue Aug 22, 2006 10:27 pm Post subject: Re: mixing metadat and data on same LUN = bad ? |
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| martygearbox wrote: | | It was my understanding that mixing metadata and data on the same LUN is a bad idea. |
Well, its not really a bad idea. You can set 1 lun to have both metadata and data, but would really affect performance.
If you have just one xserve raid, i suggest you create 2 seperate arrays on one raid controller, it is possible but would also reduce performance. 1 array with just 2 hard disk would be your metadata on a raid 1 and the rest will be set to raid 5. and on the other raid controller, you can have it as a data lun.
all in all, you have 3 luns which seperates your metadata and data. |
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