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| SSD resilient? Your expirence https://3parug.com/viewtopic.php?f=18&t=3015 |
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| Author: | skumflum [ Sun Oct 21, 2018 1:51 pm ] |
| Post subject: | SSD resilient? Your expirence |
I'm a little curious. (hope I don't jinx it)  We have run a 8400 with 64x3.84TB drives for 3 years. We have never experienced a failed drive. All drives are 99-100% in lifetime left and all Error Counters is zero. Have you guys had any failed SSD? And what about multiple failed SSD's in a row. Our old 7400 with mechanical drives had many failures |
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| Author: | Richard Siemers [ Sun Oct 21, 2018 10:17 pm ] |
| Post subject: | Re: SSD resilient? Your expirence |
Never seen a 3PAR SSD fail. Seen plenty of EMC DataDomain's SSD run low on lifetime and get proactively replaced. I have seen an SSD fail in a non-3PAR array, non-eventful, standard hot swap like a spinner. If we're keeping score, it was a SATA mLC SSD, not SAS. |
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| Author: | cali [ Mon Oct 22, 2018 6:34 am ] |
| Post subject: | Re: SSD resilient? Your expirence |
skumflum wrote: Have you guys had any failed SSD? Have around 700 SSD and never a Failed SSD Drive. (Got 1 Drive that have 1 missing Port OOTB) skumflum wrote: And what about multiple failed SSD's in a row. Migrate to Raid 6. It have robustness 12.000 - 25.000. Read this: HPE 3PAR RAID 6 technical white paper https://h20195.www2.hpe.com/v2/Getdocum ... 0000244enw |
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| Author: | skumflum [ Wed Oct 24, 2018 3:51 am ] |
| Post subject: | Re: SSD resilient? Your expirence |
Thank you... 700 disk an no failures that is something! I am planing to change the RAID level to R6 14+2 (maintaning the data efficiency of our current R5 7+1) Iif I change the CPG from CLI and run tunesys the LD should be converted right? Do you know anything about how much free space that requieres? |
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| Author: | MammaGutt [ Wed Oct 24, 2018 10:03 am ] |
| Post subject: | Re: SSD resilient? Your expirence |
7+1 and 14+2 has the same RAID overhead so final state will require the same. However it will require some extra space during the tunesys. |
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| Author: | skumflum [ Wed Oct 24, 2018 2:03 pm ] |
| Post subject: | Re: SSD resilient? Your expirence |
MammaGutt wrote: 7+1 and 14+2 has the same RAID overhead so final state will require the same. However it will require some extra space during the tunesys. Can I calculate the requirement during the tunesys. I have used 80% of the capacity and it would be a bad day at work if it ran full
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| Author: | MammaGutt [ Thu Oct 25, 2018 6:34 am ] |
| Post subject: | Re: SSD resilient? Your expirence |
skumflum wrote: MammaGutt wrote: 7+1 and 14+2 has the same RAID overhead so final state will require the same. However it will require some extra space during the tunesys. Can I calculate the requirement during the tunesys. I have used 80% of the capacity and it would be a bad day at work if it ran full I've never been able to do that. When you start tunesys it will compact some for each iteration but from my experience it will grow new LDs faster than compacting the old ones (expect the final few steps). What I've ended up doing is either tuning individual LDs (showld -d shows which are running which RAID level and set size) or do tunesys, stop it when I reach 95%, compact CPG, restart tunesys, stop it at 95%, compact CPG and keep on doing that until it's done. |
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| Author: | Proc_rqrd [ Thu Oct 25, 2018 12:58 pm ] |
| Post subject: | Re: SSD resilient? Your expirence |
several 3par 7x and 8x SSD only arrays. only ever had one failre after an upgrade (pd firmware upgrade didnt work out). so far so good. if i had it my way..it would be the only drives we used. |
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