dynamox
7 Thorium

Re: Symmetrix VMAX performance troubleshooting

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Virtual lun migrator with caviat that you need to move to device with different protection.

Sent from my Verizon Wireless 4GLTE Phone

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Kavan2
3 Silver

Re: Symmetrix VMAX performance troubleshooting

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In one of my original questin... for FAST...

during the data migration.. is it good to enabel/use FAST ???? or is it best to leave it till data migration is complete ??

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dynamox
7 Thorium

Re: Symmetrix VMAX performance troubleshooting

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when my DBAs are using Oracle ASM to migrate data from DMX3 to VMAX, i do not enable FAST on the storage group until after they complete their migration. I figured FAST would be trashing back and forth during the migration so i prefer to let it "back-in" for a week and then enable FAST.

Kavan2
3 Silver

Re: Symmetrix VMAX performance troubleshooting

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Thanks Dynamox that’s helpful.

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Kavan2
3 Silver

Re: Symmetrix VMAX performance troubleshooting

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Hi guys,

back to the performance issue ,

i got a tdev : about 1.90TB meta of 240GB each meta meber.  SATA drives.RAID6.

i grabed the stats from spa and i can see 5000,6000,2000 WP counts.

Is this normal, i think the figure is high. users are saying they are expereincing slowness etc. how can i decrease these.

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dynamox
7 Thorium

Re: Symmetrix VMAX performance troubleshooting

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what is this device used for ?

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Kavan2
3 Silver

Re: Symmetrix VMAX performance troubleshooting

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Device is used for VMDK. Datastore.

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dynamox
7 Thorium

Re: Symmetrix VMAX performance troubleshooting

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probably not a very good i/o profile for raid-6,  so many WP because SATA is slow, can't destage writes fast enough. Might need to move storage vmotion some VMs to other datastores or move this entire device to another tier.

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Quincy561
4 Beryllium

Re: Symmetrix VMAX performance troubleshooting

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5000 WP tracks may not be very high at all.

Check your device and system WP maximum with symcfg list -v

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Kavan2
3 Silver

Re: Symmetrix VMAX performance troubleshooting

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Thanks Quincy , that was what I was looking for, the theoretically possible value and the actual one.

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