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тАО09-24-2002 03:56 PM
тАО09-24-2002 03:56 PM
2405 Disk System Performance
Ted
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тАО09-25-2002 12:41 AM
тАО09-25-2002 12:41 AM
Re: 2405 Disk System Performance
other opention is crate only one vg and configure the disk in struipping.... thus traffic is balancd over all disks
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тАО09-25-2002 06:46 AM
тАО09-25-2002 06:46 AM
Re: 2405 Disk System Performance
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тАО09-25-2002 07:23 AM
тАО09-25-2002 07:23 AM
Re: 2405 Disk System Performance
lvcreate with -m and -D options
see man page ;-)
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тАО09-25-2002 08:34 AM
тАО09-25-2002 08:34 AM
Re: 2405 Disk System Performance
lvcreate -m 1 -D -n
is that all I need to do? it would basically create the logical volume and mirror it at the same time so that 4 disk would have the principle stripe (PE) and the other 4 would have the mirror? And since the volume group was created with strict allocation it will automatically avoid placing any mirror PEs on the same disk?
If so.. that would be great!
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тАО09-25-2002 08:36 AM
тАО09-25-2002 08:36 AM
Re: 2405 Disk System Performance
There are two kinds of striping, block based and extent based. Block based is not supported by HP when you are mirroring via mirrordisk. Block based would be if you used lvcreate with the -i or -I options. These options are incompatible with -m mirror option (see lvcreate man page).
Extent based striping gives you no control over the block size of the stripe, but does let you write extents in a round robin fashion to the drives you specify, whether mirrored or not. lvcreate with -D ("distributed") option creates extent based stripes, and is fully compatible with the -m option for mirroring extents.
The problem is, extents are large (4M default), and don't provide much benefit from striping them for most applications or block sizes. Typical block size are in the k-byte range (8k, 16k, etc), so you are still doing many (500 to 1000) before moving to a new extent on another drive. For apps with larger block sizes (I don't know of any), this might be useful, but not for most.
Decisions, decisions. This is the case for a raid unit front-ending your JBOD. When your disks are protected with RAID (HW), now you don't use SW mirroring, and are free to use block-based striping and the -i or -I option to lvcreate. This lets you set the strip size down at the level where most apps get benefit from striping. All you need to remember to facilitate this is, you need lots (more than two) of LUNs/PVs to make striping pay off, so make lots of small LUNs, not one or two large ones.
Best Regards,
--bmr
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тАО09-25-2002 08:42 AM
тАО09-25-2002 08:42 AM
Re: 2405 Disk System Performance
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тАО09-25-2002 10:35 AM
тАО09-25-2002 10:35 AM
Re: 2405 Disk System Performance
If you think about a Raid solution you don't have to bother about striping and other in HP-HX. Let the Raid controller the job. For best performance create a Raid set of all 8 disks with Raid level 1+0 (striping + mirroring). Then use this for creating ordinary logical volumes as needed.
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тАО09-25-2002 11:39 AM
тАО09-25-2002 11:39 AM
Re: 2405 Disk System Performance
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