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тАО09-12-2007 03:20 AM
тАО09-12-2007 03:20 AM
HPUX 11i V1 - with HPUX Mirror app Installed.
How can I set them up in RAID5 ?
Solved! Go to Solution.
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тАО09-12-2007 03:22 AM
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тАО09-12-2007 03:22 AM
тАО09-12-2007 03:22 AM
Re: HPUX 11i Raid 5
The MirrorDisk/UX software allows you to mirror (Raid 1) only. There is no software support for RAID 5 with HP-UX LVM.
I **THINK** that you can do software raid 5 if you convert to the full version of Veritas Volume Manager (VXVM) software. I'm not completely certain though.
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тАО09-12-2007 04:13 AM
тАО09-12-2007 04:13 AM
Re: HPUX 11i Raid 5
Bill Hassell, sysadmin
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тАО09-12-2007 05:13 AM
тАО09-12-2007 05:13 AM
Re: HPUX 11i Raid 5
I'll assume, with the other readers, that it is directly connected and then the answer would be NO.
To expand a little on Bill's reply:
>> RAID 5 is only useful when it is run by a dedicated controller.
Because it really needs a battery backed-up write-back cache to get decend performance
>> If you buy the Advanced VxVM (Veritas Volume Manager), you can setup RAID 5 but be aware that like any RAID 5 arrangement, there is a *LOT* of CPU required to spread the bytes across multiple disks and to compute associated parity codes.
I would worry more about the IO required than the CPU needed, but the end result is the same: Too costly. For every write to a raid-5 disk the system needs to 1) read-old-data (probably already in cache) 2) read-old-parity 3) write new-data 4) write new parity. 1 IO turns into 4, and the read-old-parity is likely to be a non-cached, slow IO.
>> it will be tough to setup RAID 5 with just 4 disks. The minimum (not recommended though) is 3 disks with 5 disks being the most common method.
With 4 drive raid 5 you get 3 drives worth of data and a lot of hassle (hassell?).
Change to raid-1 and performance get's better and you still have 2 out of 4 drivers for data. 50% less, bit not too bad perhaps.
fwiw,
Hein.
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тАО09-12-2007 05:36 AM
тАО09-12-2007 05:36 AM
Re: HPUX 11i Raid 5
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тАО09-12-2007 05:37 AM
тАО09-12-2007 05:37 AM
Re: HPUX 11i Raid 5
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тАО09-12-2007 06:46 AM
тАО09-12-2007 06:46 AM
Re: HPUX 11i Raid 5
Hope this helps!
Regards
Torsten.
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тАО09-13-2007 02:32 AM
тАО09-13-2007 02:32 AM