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0 pointssingron3y ago0 comments

RDS tops out at about 18000 IOPS since it uses a single ebs volume. Any decent ssd will do much better. E.g. a 970 evo will easily do >100K IOPS and can do more like 400K in ideal conditions.

You can get that many IOPS with aurora, but the cost is exorbitant.

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4 comments · 3 top-level

raffraffraff3y ago· 1 in thread

I believe RDS automatically stripes EBS volumes under the hood, but don't expose that information to you unless you enable enhanced metrics (it's shown under "Physical Device I/O", where you can infer the number of volumes in the stripe). I have no idea when the striping kicks in - presumable some specific volume size for gp2, or some provisioned IOPS setting.

According to the link below, provisioned IOPS tops out at 256000:

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_....

singronOP3y ago

Provisioned IOPS is insanely expensive. Running 256K IOPS is $25K/month. You could outright buy multiple 970 EVOs every day and spend less money.

mcbain3y ago

I don't think it has been a single EBS volume for a while, but in any case, 256k is more than 18k. https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_...

StreamBright3y ago

And this is very rarely the only dimension we chose technology by.

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