topic Re: Adding SSD Read Cache after volume/LUN creation in MSA Storage

Adding SSD Read Cache after volume/LUN creation

mr_vaughn — Thu, 03 Aug 2023 03:53:24 GMT

SSD SED's are on back order for over a month.

I and going to create my Disk Pools on each controller.

each is going to get a SSD read cache.

We need to start data migration ASAP.

Can I create my volumes/LUN's on the diskpools and then add the SSD read cache later without affecting the data on volumes ?

Re: Adding SSD Read Cache after volume/LUN creation

JonPaul — Wed, 02 Aug 2023 19:16:04 GMT

@mr_vaughn
Yes you can add disk-groups to a Pool at any time. You can also remove them but that requires some timeframe to DRAIN all the data on the disk-group to the remaining disk-groups in the pool. Caveat: you need enough free capacity in the remaining disk-groups to retain all the data on the disk-group beng removed.
A READ-CACHE is a special disk-group in that it retains no unique data and is copy of the data retained on HDD and can be removed quickly. Adding the READ-CACHE after the fact will take some time to fill the READ-CACHE and the performance of the system will gradually increase.

Re: Adding SSD Read Cache after volume/LUN creation

Sunitha_Mod — Mon, 21 Aug 2023 14:57:10 GMT

Hello @mr_vaughn,

Let us know if you were able to resolve the issue.

If you have no further query and you are satisfied with the answer then kindly mark the topic as Solved so that it is helpful for all community members.