Am 28.06.2019 um 16:46 schrieb Blake Hudson <bl...@ispn.net>: > > Nikos Gatsis - Qbit wrote on 6/27/2019 8:36 AM: >> Hello list. >> >> The next days we are going to install Centos 7 on a new server, with 4*3Tb >> sata hdd as raid-5. We will use the graphical interface to install and set >> up raid. >> >> Do I have to consider anything before installation, because the disks are >> very large? >> >> Does the graphical use the parted to set/format the raid? >> > > Hi Nikos, I've read the other posts in this thread and wanted to provide my > perspective. I've used Linux RAID at various times over the past 10-20 years > with both desktop and server class hardware. I've also used hardware RAID > controllers from 3ware, Adaptec, LSI, AMI, and others with IDE, SATA, SAS, > and SCSI drives. The goal of RAID 1 and above is to increase availability. > Unfortunately, I've never had Linux software RAID improve availability - it > has only decreased availability for me. This has been due to a combination of > hardware and software issues that are are generally handled well by HW RAID > controllers, but are often handled poorly or unpredictably by desktop > oriented hardware and Linux software. > > Given that Linux software RAID does not achieve the goal of RAID (improved > availability), my recommendation would be to avoid it. If you are looking for > a backup mechanism, RAID is not it (use a backup program instead). If you do > need high availability, my recommendation is to purchase an LSI based RAID > controller. If you plan to use RAID 5, make sure the model you choose has a > write cache (this could double the cost of the controller). Used IBM, HP, or > Dell RAID controllers are available for a reasonable price or you can > purchase a new one from Newegg or wherever. SAS RAID controllers will work > with either SAS or SATA drives and you can purchase the appropriate breakout > cables for connecting the controller to individual drives. Since you're > planning on using 3TB+ drives that are likely 4k native sector, I'd recommend > a newer model controller like the Dell PERC H730 (LSI MegaRAID SAS 9361-8i) > for RAID5/6 or a PERC H330 (LSI MegaRAID SAS 9341-8i) for RAID 0/1/10. >
We have good experiences with MD RAID (Linux software RAID) - for having data redundancy at low cost. For availability we use clustering (different hardware level) ... -- LF _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
