Hi ToddAndMargo! On 2015.05.06 at 00:48:30 -0700, ToddAndMargo wrote next:
> http://www.intel.ie/content/dam/www/public/us/en/documents/white-papers/ssd-dc-s3500-workload-raid-paper.pdf > > > The system used for RAID 1 testing include the following: > • LSI MegaRAID 9265-8i* controller card > > To summarize: > • In both RAID 1 and RAID 5, the Intel SSD DC S3500 Series > drive shows excellent scalability, performance, and consistency. > > • Very little latency was introduced by the RAID controller > in RAID 1. In RAID 5, the overhead and latency are slightly > higher. > > • In random, mixed read/write workloads, SSDs perform > significantly (as much as 100 times) better than HDDs > in a similar situation > > > Maybe the S3500 is what I want? They are still available > at my distributors. They are fine drives. In fact, I got servers running them; excellent performance, no problem with incompressible data (unlike drives with SF controllers) - this matters to me because I'm using zfs on linux with compression. Sustained write speed >500 MB/s (480GB model). However, like I said before, if long-term performance is needed, I advise against using them in hardware RAID controller. This document only shows after-install performance; they didn't do any endurance testing. Without TRIM, performance of this drive will degrade. Buy Plextor M5/M6 if your environment doesn't support TRIM. I'm curious, what stops you from using software RAID with mdadm? For two-disk RAID 1 it provides excellent performance, high compatibility and TRIM support. I could understand if you needed hardware controller for RAID6 with tons of disks, in RAID6 or something, but for two-disk RAID1?.. -- Vladimir