Is it okay to use separate drives and RAID on Squid?
RAID1 is fine, and so are separate drives. RAID0 (striping) with Squid only gives you the drawback that if you lose one of the drives the whole stripe set is lost. There is no benefit in performance as Squid already distributes the load on the drives quite nicely. Squid is the worst case application for RAID5, whether hardware or software, and will absolutely kill the performance of a RAID5. Once the cache has been filled Squid uses a lot of small random writes which the worst case workload for RAID5, effectively reducing write speed to only little more than that of one single drive. Generally seek time is what you want to optimize for Squid, or more precisely the total amount of seeks/s your system can sustain. Choosing the right RAID solution generally decreases the amount of seeks/s your system can sustain significantly.
RAID1 is ne, and so are separate drives. RAID0 (striping) with Squid only gives you the drawback that if you lose one of the drives the whole stripe set is lost. There is no bene t in performance as Squid already distributes the load on the drives quite nicely. Squid is the worst case application for RAID5, whether hardware or software, and will absolutely kill the performance of a RAID5. Once the cache has been lled Squid uses a lot of small random writes which the worst case workload for RAID5, e ectively reducing write speed to only little more than that of one single drive. Generally seek time is what you want to optimize for Squid, or more precisely the total amount of seeks/s your system can sustain. Choosing the right RAID solution generally decreases the amount of seeks/s your system can sustain signi cantly.
RAID1 is fine, and so are separate drives. RAID0 (striping) with Squid only gives you the drawback that if you lose one of the drives the whole stripe set is lost. There is no benefit in performance as Squid already distributes the load on the drives quite nicely. Squid is the worst case application for RAID5, whether hardware or software, and will absolutely kill the performance of a RAID5. Once the cache has been filled Squid uses a lot of small random writes which the worst case workload for RAID5, effectively reducing write speed to only little more than that of one single drive. Generally seek time is what you want to optimize for Squid, or more precisely the total amount of seeks/s your system can sustain. Choosing the right RAID solution generally decreases the amount of seeks/s your system can sustain significantly. —–Original Message—– From: agencies_ad1@sancharnet.
