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> The read performance on the SATA SSDs is great but the writes are atrocious. If a 10K SAS HDD array is outperforming even a single SATA SSD, either your I/O
by theevilsharpie 6y ago
> The read performance on the SATA SSDs is great but the writes are atrocious.
If a 10K SAS HDD array is outperforming even a single SATA SSD, either your I/O access pattern is extremely sequential, or there's something wrong with how your storage is configured.
- yardie 6y agoOur environment is almost entirely virtualized, so yes, extremely sequential. Each host has 2 or more 10Gbps NICs. So starting, suspending, moving, snapshoting and cloning a VM shows the limits in both. Our SAN is 4 years old and has tiered storage (10k SAS mainline HDDs and high-write SAS SSDs). We use cheaper SSDs in some instances. But there is a performance difference of 15%-25% between SAS and SATA and that can't be ignored.