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тАО07-15-2005 03:12 AM
тАО07-15-2005 03:12 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
Sorry, I've been throwing around the term LUN to mean 'a presented vdisk' when I really mean (e.g.) VMS os_unit, your usage is of course correct. VMS (as of 7.3-2) does still only use one path per host. My impression until now was that even multiple hosts were all using the same controller port to the same unit (at least on Hsg80s). I guess it is easy enough for me to check on this for the hsg80 and eva5000.
Jeff,
I'm curious about the justification for creating numerous small storage sets and striping them at the host. The eva will stripe over all the disks is the group, so what is the point of this? If it is to load balance across paths, would not 4 vdisks per host device be enough?
Also, couldn't one buy several EVAs for the price of the other arrays you recommend? Just to add front end fibre ports approaches the price of another eva system. Anyway, it is strange that a single small eva is specified in this config.
rccmum,
To followup on Jeff's comment, you do have a fairly small configuration - 2C6D to connect all those systems. You have gotten only 56 15K drives. If you are not filling a configuration (240 drives), you get a faster system for the same price by buying 10K drives, since you get so many more of them/dollar. This is mentioned in the best practices paper.
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тАО07-15-2005 04:55 AM
тАО07-15-2005 04:55 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
Why would I say Use something like a DMX, why not have 15k drives with more/faster cache, direct linked controllers that can share their I/O, an UPS insdie the frame, more fibers off of the controllers, and having seen higher reliability in practice, and that you've spent probably a million dollers on a superdome. Why cheap out on the slowest/greatest bottlneck you have left, being the disk.
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тАО07-15-2005 05:17 AM
тАО07-15-2005 05:17 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
High end locally attached disks would be the ideal because they dont have to share ;). SAN is supposed to bring cost efficiency and ease of management, and virutalizing large disks, although somethings I wonder about the cost efficient part :).
You can get way more fibers and controllers off of a DMX or XP even though they cost more, better prefetch software, more, faster cache, and more importantly more relieable.
I run DMX3000, symetrix, and XP1024 on our 7 Domes at my location, and PVlinks.
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тАО07-17-2005 11:18 PM
тАО07-17-2005 11:18 PM
Re: LUN Distribution Disk Group Striping in EVA 5000
Waiting for Smart answers!!!! to questions mentioned.
Any suggestions for putting oracle 8i on EVA 5000? We would be migrating to oracle 9i later from 8i on the eva. can anyone suggest me to have some proactive things which could be done right away to ease migration at later stage?
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тАО07-29-2005 05:15 AM
тАО07-29-2005 05:15 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
Waiting for replies..
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тАО07-29-2005 05:29 AM
тАО07-29-2005 05:29 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
Cheers Jeff
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тАО08-01-2005 06:48 AM
тАО08-01-2005 06:48 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
If you did extent based striping, you could start striping across 16 LUNs and then later extend the VG by striping across an additional 4 LUNs.
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тАО08-03-2005 04:12 AM
тАО08-03-2005 04:12 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
Seems to me you have gotten pretty good answers to all four questions you asked. Could you re-ask, in more detail, the questions you still have? Thanks.
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тАО08-04-2005 03:00 AM
тАО08-04-2005 03:00 AM
Re: LUN Distribution Disk Group Striping in EVA 5000
It made me understand EVA more closely...
Thanks all putting your comments on this thread, I appretiate your time and efforts.
Well , I have lot more questions on EVA 5000.
I would be creating new threads for them.
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