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    Ssd disk question
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    Ssd disk question

    Guys, am about to purchase 2x 120GB SSD server and I have a question.

    Its not better to do Raid0 and to use a external server for daily backup? Or to go with Raid1? Need your opinions please.

    Comments

    • Raid 1 + Backups

      Raid 1 (Protect against disk failure)

      Backups to protect against everything else

    • RAID is not a BACKUP (RINB)

      Let's bet which dot-name will collapse first ;)

    • exception0x876exception0x876 Member, Provider
      edited February 2016

      120GB is not much of a space.. I vote RAID-0 and daily backups... actually you can make system partition RAID-1 and data partition RAID-0.. this way in case of drive failure your system will still be able to boot

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    • ktkt Member, Provider
      edited February 2016

      Backup regardless of RAID.

      • Do you need the extra space?
      • How responsive is the host you are using on replacement times?
      • Does it matter if you go down whilst you wait potentially several hours for the SSD to be replaced?
    • WSCallumWSCallum Member, Provider

      RAID 1 will allow the server to stay online if one of the drives fail, don't consider RAID to be a replacement for backups as it isn't, regardless of the type of RAID used. RAID is generally in place for improved performance and redundancy in the majority of cases, backups should always be taken if your data is important to you.

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    • @WHT said:
      Guys, am about to purchase 2x 120GB SSD server and I have a question.

      Its not better to do Raid0 and to use a external server for daily backup? Or to go with Raid1? Need your opinions please.

      Abbreviated from stackoverflow/serverfault:

      If you use RAID, and you accidentally dd garbage to your thesis, RAID now creates a replica of the garbage that is now your thesis.

      Thanked by 1Junkless

      Devops Consultant | GitHub

    • As other have stated "RAID or backups" really isn't a choice: you should have regularly tested, external backups no matter what you do with the main drives. RAID1+ protects you from some disk failure scenarios, but there are a great many things it won't protect you from that good backups will. While it improves reliability and availability, it is absolutely not a backup solution nor a replacement for one.

      Beyond that, for your two drives:

      JBOD: done through LVM without RAID setup at all. Little advantage unless you already know LVM but not how to configure RAID. Advantage: single volume. Disadvantage: either drive dies and all the data is lost until restored from backup.

      JBOD manual: without LVM or anything else, manually splitting data between filesystems on the two disks. This can have advantages for some workloads because you are confining certain data access to certain drives so you can stop some tasks competing with each other for IO where they otherwise would.

      RAID0: Advantages: single volume, better performance for IO bound workloads. Disadvantage: if either drive dies and all the data is lost until restored from backup.

      RAID1: Advantages: single volume, if one drive fails your server probably stays up and no data is lost. No downtime until you physically replace the drive (no downtime at all if your setup supports hot-swap). Possible advantage: some RAID controllers can improve read performance on RAID1 volumes by striping access similarly to RAID0.

    • Hello,

      As said before always have a backup, if you have one you might loose a day in restauring a server but if you don't have one you loose everything.

      Thomas - Technical Support - ikoula.com

      hyperv vps /-/ xen cloud vm /-/ dedicated servers

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